{"id":199,"date":"2024-08-11T10:39:08","date_gmt":"2024-08-11T01:39:08","guid":{"rendered":"https:\/\/techfun.cc\/?p=199"},"modified":"2025-06-02T12:52:25","modified_gmt":"2025-06-02T03:52:25","slug":"java_base_lambda","status":"publish","type":"post","link":"https:\/\/techfun.cc\/java-base\/java_base_lambda.html","title":{"rendered":"Enum\u30fb\u30e9\u30e0\u30c0\u5f0f\u30fbStream API"},"content":{"rendered":"<h3 class=\"Heading Title Title--m\" id=\"Bookmark-1\"><span class=\"Num\">1.<\/span>\u672c\u7ae0\u3067\u306e\u5b66\u7fd2\u9805\u76ee<\/h3>\n<p>\u672c\u7ae0\u3067\u306f\u3001Enum\u53ca\u3073Java 8\u3088\u308a\u5c0e\u5165\u3055\u308c\u305f\u30e9\u30e0\u30c0\uff08Lambda\uff09\u5f0f\u3068Stream API\u306b\u95a2\u3057\u3066\u5b66\u7fd2\u3057\u307e\u3059\u3002<\/p>\n<div class=\"Separator\">\n<div class=\"Separator__child\"><\/div>\n<\/div>\n<h3 class=\"Heading Title Title--m\" id=\"Bookmark-2\"><span class=\"Num\">2.<\/span>Enum<\/h3>\n<p>Enum\u306f\u3001\u8907\u6570\u306e\u5b9a\u6570\u30921\u3064\u306e\u30af\u30e9\u30b9\u3078\u307e\u3068\u3081\u308b\u3053\u3068\u304c\u884c\u3048\u308b\u65b0\u305f\u306a\u578b\u3067\u3001\u3088\u304f\u300c\u5217\u6319\u578b\u300d\u3068\u8868\u73fe\u3055\u308c\u307e\u3059\u3002<br \/>\nEnum\u3092\u4f7f\u3046\u3053\u3068\u3067\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u306e\u53ef\u8aad\u6027\u3001\u5b89\u5168\u6027\u3092\u9ad8\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u5b9a\u7fa9\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>\u30a2\u30af\u30bb\u30b9\u4fee\u98fe\u5b50 enum \u5217\u6319\u540d {\u5217\u6319\u5b501, \u5217\u6319\u5b502, \u30fb\u30fb\u30fb;}<\/code><\/pre>\n<p>Enum\u306b\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30e1\u30ea\u30c3\u30c8\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul class=\"Base-list\">\n<li class=\"Base-list__child\">\u5b9a\u6570\u3068\u540c\u69d8\u306b\u5b9a\u6570\u5024\u30921\u30af\u30e9\u30b9\u3078\u96c6\u7d04\u3067\u304d\u308b<\/li>\n<li class=\"Base-list__child\">1\u3064\u306eEnum\u306b\u8907\u6570\u306e\u5024\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b<\/li>\n<li class=\"Base-list__child\">\u5217\u6319\u578b\u3092\u5ba3\u8a00\u3067\u304d\u308b\u305f\u3081\u3001\u60f3\u5b9a\u3057\u3066\u3044\u306a\u3044\u5024\u306e\u4f7f\u7528\u3092\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u308b<\/li>\n<li class=\"Base-list__child\">Enum\u306b\u5b9a\u7fa9\u3057\u305f\u5024\u3092\u5229\u7528\u3057\u305f\u51e6\u7406\u306e\u5b9f\u88c5\u304c\u53ef\u80fd<\/li>\n<\/ul>\n<p>\u305d\u308c\u3067\u306f\u3001\u5b9f\u969b\u306bEnum\u306e\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<h4 class=\"Heading Title Title--s\" id=\"Bookmark-2-1\"><span class=\"Num\">2.1.<\/span>Enum\u3068\u5b9a\u6570\u306e\u9055\u3044<\/h4>\n<h5 class=\"Heading Title Title--xs\" id=\"Bookmark-2-1-1\"><span class=\"Num\">2.1.1.<\/span>\u5b9a\u6570<\/h5>\n<p>Enum\u3092\u5b66\u3076\u524d\u306b\u3001\u307e\u305a\u306f\u5b9a\u6570\u306b\u3064\u3044\u3066\u5fa9\u7fd2\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<div class=\"Pre-title\">Prefecture.java<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>public class Prefecture {\r\n\r\n\tpublic static final String FUKUOKA = \"\u798f\u5ca1\u770c\";\r\n\tpublic static final String SAGA = \"\u4f50\u8cc0\u770c\";\r\n\tpublic static final String NAGASAKI = \"\u9577\u5d0e\u770c\";\r\n\tpublic static final String KUMAMOTO = \"\u718a\u672c\u770c\";\r\n\tpublic static final String OITA = \"\u5927\u5206\u770c\";\r\n\tpublic static final String MIYAZAKI = \"\u5bae\u5d0e\u770c\";\r\n\tpublic static final String KAGOSHIMA = \"\u9e7f\u5150\u5cf6\u770c\";\r\n\tpublic static final String OKINAWA = \"\u6c96\u7e04\u770c\";\r\n\r\n}<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u3088\u3046\u306b\u578b\u306e\u524d\u306b\u3001final \u3092\u4ed8\u3051\u308b\u3053\u3068\u3067\u5b9a\u6570\u3068\u3057\u3066\u5ba3\u8a00\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3057\u305f\u3002<br \/>\n\u3053\u3053\u3067\u306f\u3001Prefecture \u3068\u3044\u3046\u5b9a\u6570\u3092\u5ba3\u8a00\u3059\u308b\u305f\u3081\u306e\u30af\u30e9\u30b9\u3092\u4f5c\u6210\u3057\u3001\u30af\u30e9\u30b9\u5909\u6570\u3068\u3057\u3066\u5b9a\u6570\u3092\u5b9a\u7fa9\u3057\u3066\u3044\u307e\u3059\u3002<br \/>\n\u3053\u306e\u3088\u3046\u306b\u5b9a\u6570\u3092\u5ba3\u8a00\u3059\u308b\u30af\u30e9\u30b9\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u3067\u3001\u5b9a\u6570\u306e\u5024\u306e\u60c5\u5831\u304c\u4e00\u30af\u30e9\u30b9\u306b\u96c6\u7d04\u3055\u308c\u308b\u305f\u3081\u3001\u52a0\u7b46\u4fee\u6b63\u7b49\u304c\u5bb9\u6613\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u4e0a\u8a18\u3067\u5ba3\u8a00\u3057\u305f\u30af\u30e9\u30b9\u306f\u3001\u4e0b\u8a18\u306e\u3088\u3046\u306b\u7528\u3044\u308b\u3053\u3068\u304c\u51fa\u6765\u307e\u3059\u3002<\/p>\n<div class=\"Pre-title\">StaticMain.java<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>public class StaticMain {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tString prefecture = Prefecture.OKINAWA;\r\n\r\n\t\tSystem.out.println(prefecture + \"\u306e\u4eba\u53e3\u306f\"\r\n\t\t\t+ population(prefecture) + \"\u4eba\u3067\u3059\");\r\n\t}\r\n\r\n\t\/\/ \u5404\u90fd\u9053\u5e9c\u770c\u306e\u4eba\u53e3\u3092return\u3059\u308b\u30e1\u30bd\u30c3\u30c9\r\n\tprivate static String population(String prefecture) {\r\n\t\tString population = null;\r\n\r\n\t\tswitch (prefecture) {\r\n\t\t\tcase Prefecture.FUKUOKA:\r\n\t\t\t\tpopulation =  \"5,101,556\";\r\n\t\t\t\tbreak;\r\n\t\t\tcase Prefecture.SAGA:\r\n\t\t\t\tpopulation =  \"832,832\";\r\n\t\t\t\tbreak;\r\n\t\t\tcase Prefecture.NAGASAKI:\r\n\t\t\t\tpopulation =  \"1,377,187\";\r\n\t\t\t\tbreak;\r\n\t\t\tcase Prefecture.KUMAMOTO:\r\n\t\t\t\tpopulation =  \"1,786,170\";\r\n\t\t\t\tbreak;\r\n\t\t\tcase Prefecture.OITA:\r\n\t\t\t\tpopulation =  \"1,166,338\";\r\n\t\t\t\tbreak;\r\n\t\t\tcase Prefecture.MIYAZAKI:\r\n\t\t\t\tpopulation =  \"1,104,069\";\r\n\t\t\t\tbreak;\r\n\t\t\tcase Prefecture.KAGOSHIMA:\r\n\t\t\t\tpopulation =  \"1,648,177\";\r\n\t\t\t\tbreak;\r\n\t\t\tcase Prefecture.OKINAWA:\r\n\t\t\t\tpopulation =  \"1,433,566\";\r\n\t\t\t\tbreak;\r\n\t\t}\r\n\t\treturn population;\r\n\t}\r\n\r\n}<\/code><\/pre>\n<p>Prefecture\u30af\u30e9\u30b9\u3067\u306f\u3001\u30af\u30e9\u30b9\u5909\u6570\u3068\u3057\u3066\u5b9a\u7fa9\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\u3059\u308b\u3053\u3068\u306a\u304f\u7528\u3044\u308b\u3053\u3068\u304c\u51fa\u6765\u307e\u3059\u3002<\/p>\n<h5 class=\"Heading Title Title--xs\" id=\"Bookmark-2-1-2\"><span class=\"Num\">2.1.2.<\/span>Enum<\/h5>\n<p>\u305d\u308c\u3067\u306f\u3001Enum\u306b\u3064\u3044\u3066\u5b66\u3093\u3067\u3044\u304d\u307e\u3057\u3087\u3046\u3002<br \/>\nEnum\u306f\u524d\u8ff0\u306e\u901a\u308a\u300c\u5217\u6319\u578b\u300d\u3068\u8868\u73fe\u3055\u308c\u307e\u3059\u3002<br \/>\n\u305f\u3060\u3001\u300c\u5217\u6319\u578b\u300d\u3068\u3044\u3063\u3066\u3082\u60f3\u50cf\u304c\u4ed8\u304d\u96e3\u3044\u3068\u601d\u3044\u307e\u3059\u306e\u3067\u3001\u5b9f\u969b\u306e\u30b3\u30fc\u30c9\u3092\u4f5c\u6210\u3057\u306a\u304c\u3089\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<p>Enum\u3092\u4f5c\u6210\u3059\u308b\u3084\u308a\u65b9\u306f\u3001\u30af\u30e9\u30b9\u4f5c\u6210\u306e\u624b\u9806\u3068\u307b\u3068\u3093\u3069\u540c\u69d8\u3067\u3059\u3002<br \/>\nEnum\u3092\u4f5c\u6210\u3057\u305f\u3044\u30d5\u30a9\u30eb\u30c0\u3092\u53f3\u30af\u30ea\u30c3\u30af\u3057\u3001\u30e1\u30cb\u30e5\u30fc\u304b\u3089\u300c\u65b0\u898f\u300d\u21d2\u300c\u5217\u6319\u578b\u300d\u3092\u9078\u629e\u3057\u3001\u540d\u524d\u3092\u5165\u529b\u3057\u307e\u3059\u3002<\/p>\n<p><a class=\"Ext Image-link\" href=\"https:\/\/techfun.cc\/wp-content\/uploads\/2024\/10\/lambda-enum_create.png\"><br \/>\n\t<img decoding=\"async\" src=\"https:\/\/techfun.cc\/wp-content\/uploads\/2024\/10\/lambda-enum_create.png\" alt=\"lambda enum create\"><br \/>\n<\/a><\/p>\n<p>Enum\u3092\u4f5c\u6210\u3057\u305f\u3089\u3001\u6b21\u306e\u30b5\u30f3\u30d7\u30eb\u30bd\u30fc\u30b9\u306e\u5185\u5bb9\u3092\u8a18\u8ff0\u3057\u3066\u304f\u3060\u3055\u3044\u3002<br \/>\n\u203b \u30b3\u30fc\u30c9\u5185\u306e\u3001(1)\uff5e(5)\u306e\u5024\u306f\u8a18\u8ff0\u4e0d\u8981\u3067\u3059<\/p>\n<div class=\"Pre-title\">PrefectureEnum.java<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>(1)\r\npublic enum PrefectureEnum {\r\n\t(2)\r\n\tFUKUOKA(\"\u798f\u5ca1\u770c\"),\r\n\tSAGA(\"\u4f50\u8cc0\u770c\"),\r\n\tNAGASAKI(\"\u9577\u5d0e\u770c\"),\r\n\tKUMAMOTO(\"\u718a\u672c\u770c\"),\r\n\tOITA(\"\u5927\u5206\u770c\"),\r\n\tMIYAZAKI(\"\u5bae\u5d0e\u770c\"),\r\n\tKAGOSHIMA(\"\u9e7f\u5150\u5cf6\u770c\"),\r\n\tOKINAWA(\"\u6c96\u7e04\u770c\");\r\n\r\n\t(3)\r\n\tprivate String prefectureName;\r\n\t(4)\r\n\tprivate PrefectureEnum(String prefectureName) {\r\n\t\tthis.prefectureName = prefectureName;\r\n\t}\r\n\t(5)\r\n\tpublic String getPrefectureName() {\r\n\t\treturn prefectureName;\r\n\t}\r\n\r\n}<\/code><\/pre>\n<p>\u4e0a\u8a18\u306f\u5148\u307b\u3069\u306e\u9805\u3067\u4f5c\u6210\u3057\u305f\u3001Prefecture \u30af\u30e9\u30b9\u3068\u307b\u307c\u540c\u3058\u5f79\u5272\u3092\u6301\u3061\u307e\u3059\u3002<br \/>\nEnum\u306e\u8a18\u8f09\u65b9\u6cd5\u306f\u7c21\u5358\u3067\u3001\u4e0b\u8a18\u306e\u901a\u308a\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<table class=\"Base-table\">\n<tr>\n<td class=\"Center\">(1)<\/td>\n<td>\u901a\u5e38 public class \uff5e \u3068\u7d9a\u304f\u3068\u3053\u308d\u3092 public enum \uff5e \u3068\u3059\u308b\u3002<\/td>\n<\/tr>\n<tr>\n<td class=\"Center\">(2)<\/td>\n<td>public enum \u306e\u4e0b\u306b\u5217\u6319\u5b50\u3067\u5ba3\u8a00\u3059\u308b\u3002<br \/>\n\t\t\t\u203b\u5217\u6319\u5b50\u3068\u306f\u30b5\u30f3\u30d7\u30eb\u306e\u300cFUKUOKA\u300d\u3084\u300cSAGA\u300d\u7b49\u3092\u6307\u3057\u307e\u3059<\/td>\n<\/tr>\n<tr>\n<td class=\"Center\">(3)<\/td>\n<td>\u4e0a\u3067\u5ba3\u8a00\u3057\u305f\u300c\u5024\u300d\u306b\u5bfe\u5fdc\u3059\u308b\u5909\u6570\u3092private\u3067\u5ba3\u8a00\u3059\u308b\u3002<\/td>\n<\/tr>\n<tr>\n<td class=\"Center\">(4)<\/td>\n<td>\u4e0a\u3067\u5ba3\u8a00\u3057\u305f\u5909\u6570\u3092\u5f15\u6570\u306b\u6301\u3064\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u5ba3\u8a00\u3059\u308b\u3002<\/td>\n<\/tr>\n<tr>\n<td class=\"Center\">(5)<\/td>\n<td>\u5909\u6570\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306e\u30e1\u30bd\u30c3\u30c9\u3092public\u3067\u4f5c\u6210\u3059\u308b\u3002<\/td>\n<\/tr>\n<\/table>\n<p>\u3055\u3066\u3001\u4f5c\u6210\u3057\u305fEnum\u306f\u4e0b\u8a18\u306e\u3088\u3046\u306b\u7528\u3044\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<div class=\"Pre-title\">EnumMain.java<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>public class EnumMain {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\t\/\/ PrefectureEnum\u578b\u306eKUMAMOTO\u3092\u7528\u3044\u308b\u3053\u3068\u3092\u5ba3\u8a00\r\n\t\tPrefectureEnum prefectureEnum = PrefectureEnum.KUMAMOTO;\r\n\r\n\t\tSystem.out.println(prefectureEnum.getPrefectureName()\r\n\t\t\t+ \"\u306e\u4eba\u53e3\u306f\" + population(prefectureEnum) + \"\u4eba\u3067\u3059\");\r\n\t}\r\n\r\n\t\/\/ \u5404\u90fd\u9053\u5e9c\u770c\u306e\u4eba\u53e3\u3092return\u3059\u308b\u30e1\u30bd\u30c3\u30c9\r\n\tprivate static String population(PrefectureEnum prefecture) {\r\n\t\tString population = null;\r\n\r\n\t\t\/\/ \u5f15\u6570prefecture\u306b\u306f\u3001main\u30e1\u30bd\u30c3\u30c9\u5074\u3067KUMAMOTO\u3092\u7528\u3044\u305f\u5909\u6570\u3092\u6e21\u3057\u3066\u3044\u308b\u305f\u3081\u3001\r\n\t\t\/\/ case KUMAMOTO\u3068\u5408\u81f4\u3059\u308b\u3002\u3053\u306e\u3088\u3046\u306bEnum\u306fswich-case\u6587\u3068\u76f8\u6027\u304c\u826f\u3044\r\n\t\tswitch (prefecture) {\r\n\t\t\tcase FUKUOKA:\r\n\t\t\t\tpopulation =  \"5,101,556\";\r\n\t\t\t\tbreak;\r\n\t\t\tcase SAGA:\r\n\t\t\t\tpopulation =  \"832,832\";\r\n\t\t\t\tbreak;\r\n\t\t\tcase NAGASAKI:\r\n\t\t\t\tpopulation =  \"1,377,187\";\r\n\t\t\t\tbreak;\r\n\t\t\tcase KUMAMOTO:\r\n\t\t\t\tpopulation =  \"1,786,170\";\r\n\t\t\t\tbreak;\r\n\t\t\tcase OITA:\r\n\t\t\t\tpopulation =  \"1,166,338\";\r\n\t\t\t\tbreak;\r\n\t\t\tcase MIYAZAKI:\r\n\t\t\t\tpopulation =  \"1,104,069\";\r\n\t\t\t\tbreak;\r\n\t\t\tcase KAGOSHIMA:\r\n\t\t\t\tpopulation =  \"1,648,177\";\r\n\t\t\t\tbreak;\r\n\t\t\tcase OKINAWA:\r\n\t\t\t\tpopulation =  \"1,433,566\";\r\n\t\t\t\tbreak;\r\n\t\t}\r\n\t\treturn population;\r\n\t}\r\n\r\n}<\/code><\/pre>\n<p>\u5148\u306e\u5b9a\u6570\u3092\u7528\u3044\u305f\u30b3\u30fc\u30c9\u3068\u306e\u9055\u3044\u306f\u3001population\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u306e\u30c7\u30fc\u30bf\u578b\u304c\u3001String\u578b\u3067\u306f\u306a\u304f\u3001\u5148\u307b\u3069\u4f5c\u6210\u3057\u305f PrefectureEnum\u578b\u306b\u306a\u3063\u3066\u3044\u308b\u3053\u3068\u3067\u3059\u3002<br \/>\n\u5217\u6319\u578b\u3092\u5f15\u6570\u3068\u3057\u3066\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u3067\u3001\u5217\u6319\u578b\uff08\u3053\u3053\u3067\u306fPrefectureEnum\u578b\uff09\u3067\u5ba3\u8a00\u3057\u3066\u3044\u308b\u5217\u6319\u5b50\u3057\u304b\u6e21\u305b\u306a\u304f\u306a\u308b\u305f\u3081\u3001<br \/>\nString\u578b\u306b\u3057\u305f\u5834\u5408\u306a\u3069\u306b\u767a\u751f\u3057\u3046\u308b\u3001\u60f3\u5b9a\u3057\u3066\u3044\u306a\u3044\u5024\u304c\u6e21\u3055\u308c\u308b\u3053\u3068\u304c\u306a\u304f\u306a\u308b\u70b9\u304c\u30e1\u30ea\u30c3\u30c8\u3068\u306a\u308a\u307e\u3059\u3002<br \/>\n\u307e\u305f\u3001\u3053\u3053\u3067\u306f\u76f4\u63a5\u95a2\u4fc2\u306f\u3057\u307e\u305b\u3093\u304c\u3001Enum\u306f\u5358\u7d14\u306b == \u3067\u6bd4\u8f03\u3059\u308b\u3053\u3068\u304c\u51fa\u6765\u307e\u3059\u3002<\/p>\n<h5 class=\"Heading Title Title--xs\" id=\"Bookmark-2-1-3\"><span class=\"Num\">2.1.3.<\/span>Enum\u3078\u8907\u6570\u306e\u5024\u3092\u8a2d\u5b9a<\/h5>\n<p>\u5148\u307b\u3069\u7d39\u4ecb\u3057\u305fEnum\u306f\u3001\u5024\u30921\u7a2e\u985e\u3060\u3051\u8a2d\u5b9a\u3057\u307e\u3057\u305f\u304c\u3001\u5024\u3092\u8907\u6570\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u3001\u30b5\u30f3\u30d7\u30eb\u30bd\u30fc\u30b9\u306b\u5f93\u3063\u3066\u3001\u5148\u7a0b\u4f5c\u6210\u3057\u305f\u300cPrefectureEnum.java\u300d\u3068\u300cEnumMain.java\u300d\u3092\u66f8\u304d\u63db\u3048\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<div class=\"Pre-title\">PrefectureEnum.java<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>public enum PrefectureEnum {\r\n\t\/\/ \u4eba\u53e3\u306b\u95a2\u3059\u308b\u5024\u3092\u8ffd\u52a0\r\n\tFUKUOKA(\"\u798f\u5ca1\u770c\",\"5,101,556\"),\r\n\tSAGA(\"\u4f50\u8cc0\u770c\",\"832,832\"),\r\n\tNAGASAKI(\"\u9577\u5d0e\u770c\",\"1,377,187\"),\r\n\tKUMAMOTO(\"\u718a\u672c\u770c\",\"1,786,170\"),\r\n\tOITA(\"\u5927\u5206\u770c\",\"1,166,338\"),\r\n\tMIYAZAKI(\"\u5bae\u5d0e\u770c\",\"1,104,069\"),\r\n\tKAGOSHIMA(\"\u9e7f\u5150\u5cf6\u770c\",\"1,648,177\"),\r\n\tOKINAWA(\"\u6c96\u7e04\u770c\",\"1,433,566\");\r\n\r\n\tprivate String prefectureName;\r\n\t\/\/ \u4eba\u53e3\u3092\u8ffd\u52a0\r\n\tprivate String population;\r\n\r\n\t\/\/ \u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306b\u4eba\u53e3\u306e\u5f15\u6570\u3092\u8ffd\u52a0\u3057\u3001\u30d5\u30a3\u30fc\u30eb\u30c9\u3078\u306e\u4ee3\u5165\u51e6\u7406\u3092\u8ffd\u52a0\r\n\tprivate PrefectureEnum(String prefectureName, String population) {\r\n\t\tthis.prefectureName = prefectureName;\r\n\t\tthis.population = population;\r\n\t}\r\n\r\n\tpublic String getPrefectureName() {\r\n\t\treturn prefectureName;\r\n\t}\r\n\r\n\t\/\/ \u4eba\u53e3\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u8ffd\u52a0\r\n\tpublic String getPopulation() {\r\n\t\treturn population;\r\n\t}\r\n\r\n}<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u30b3\u30e1\u30f3\u30c8\u90e8\u5206\u304c\u3001\u300c\u4eba\u53e3\u300d\u306b\u95a2\u3059\u308b\u90e8\u5206\u3092\u8ffd\u52a0\u3057\u305f\u7b87\u6240\u3067\u3059\u3002<\/p>\n<p>\u3053\u308c\u306b\u4f34\u3044\u3001EnumMain\u30af\u30e9\u30b9\u306e\u547c\u3073\u51fa\u3057\u65b9\u3082\u5909\u66f4\u3057\u307e\u3059\u3002<\/p>\n<div class=\"Pre-title\">EnumMain.java<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>public class EnumMain {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\t\/\/ PrefectureEnum\u578b\u306eKUMAMOTO\u3092\u7528\u3044\u308b\u3053\u3068\u3092\u5ba3\u8a00\r\n\t\tPrefectureEnum prefectureEnum = PrefectureEnum.KUMAMOTO;\r\n\r\n\t\tSystem.out.println(prefectureEnum.getPrefectureName()\r\n\t\t\t+ \"\u306e\u4eba\u53e3\u306f\" + prefectureEnum.getPopulation() + \"\u4eba\u3067\u3059\");\r\n\t}\r\n\r\n}<\/code><\/pre>\n<p>\u66f8\u304d\u63db\u3048\u305f\u3089\u3001EnumMain\u30af\u30e9\u30b9\u3092\u5b9f\u884c\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<br \/>\n\u7d50\u679c\u306f\u3001\u5148\u7a0b\u3068\u540c\u69d8\u3067\u3042\u308b\u3053\u3068\u304c\u78ba\u8a8d\u3067\u304d\u307e\u3059\u304c\u3001\u30b3\u30fc\u30c9\u304c\u3088\u308a\u7c21\u6f54\u306b\u306a\u3063\u305f\u3053\u3068\u304c\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u3088\u3046\u306b\u3001\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u8907\u6570\u306e\u5024\u3092\u6301\u305f\u305b\u308b\u3053\u3068\u3067\u3001\u95a2\u9023\u60c5\u5831\u3092\u307e\u3068\u3081\u3066\u7ba1\u7406\u3067\u304d\u308b\u305f\u3081\u3001\u4fbf\u5229\u3067\u3059\u3002<\/p>\n<h4 class=\"Heading Title Title--s\" id=\"Bookmark-2-2\"><span class=\"Num\">2.2.<\/span>\u6697\u9ed9\u306b\u5b9a\u7fa9\u3055\u308c\u308b\u30e1\u30bd\u30c3\u30c9<\/h4>\n<p>\u6b21\u306b\u3001Enum\u3067\u6697\u9ed9\u7684\u306b\u5b9a\u7fa9\u3055\u308c\u308b\u30e1\u30bd\u30c3\u30c9\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<p>Enum\u306f\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u4e0b\u8a18\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u6697\u9ed9\u7684\u306b\u5b9a\u7fa9\u3057\u3066\u3044\u307e\u3059\u3002<br \/>\n\u3068\u304f\u306b\u30e1\u30bd\u30c3\u30c9\u3092\u8ffd\u52a0\u305b\u305a\u3068\u3082\u5229\u7528\u3067\u304d\u308b\u305f\u3081\u3001\u899a\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u4e0b\u8a18\u306f\u6697\u9ed9\u306b\u5b9a\u7fa9\u3055\u308c\u308b\u4e3b\u306a\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002<\/p>\n<table class=\"Base-table\">\n<colgroup>\n<col>\n<col>\n<col>\n\t<\/colgroup>\n<thead>\n<tr>\n<th>\u30e1\u30bd\u30c3\u30c9\u540d<\/th>\n<th>static<\/th>\n<th>\u6982\u8981<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>name<\/td>\n<td class=\"Center\"><\/td>\n<td>\u5217\u6319\u5b50\u306e\u540d\u524d\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002<\/td>\n<\/tr>\n<tr>\n<td>ordinal<\/td>\n<td class=\"Center\"><\/td>\n<td>\u5217\u6319\u5b50\u306e\u9806\u756a(\u5b9a\u7fa9\u3057\u305f\u9806\u756a)\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002<\/td>\n<\/tr>\n<tr>\n<td>valueOf<\/td>\n<td class=\"Center\">\u3007<\/td>\n<td>\u4e0e\u3048\u3089\u308c\u305f\u5f15\u6570\u306e\u6587\u5b57\u5217\u306b\u8a72\u5f53\u3059\u308b\u5217\u6319\u5b50\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002<\/td>\n<\/tr>\n<tr>\n<td>values<\/td>\n<td class=\"Center\">\u3007<\/td>\n<td>\u5217\u6319\u5b50\u3092\u9806\u756a\u306b\u4e26\u3079\u305f\u914d\u5217\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4 class=\"Heading Title Title--s\" id=\"Bookmark-2-3\"><span class=\"Num\">2.3.<\/span>\u72ec\u81ea\u30e1\u30bd\u30c3\u30c9\u306e\u8ffd\u52a0<\/h4>\n<p>Enum\u306b\u306f\u6697\u9ed9\u306b\u5b9a\u7fa9\u3055\u308c\u308b\u30e1\u30bd\u30c3\u30c9\u3068\u306f\u5225\u306b\u3001Enum\u3078\u5b9a\u7fa9\u3055\u308c\u305f\u5024\u3092\u5229\u7528\u3057\u305f\u72ec\u81ea\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u8ffd\u52a0\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002<br \/>\n\u72ec\u81ea\u306e\u30e1\u30bd\u30c3\u30c9\u3067\u306f\u3001\u524d\u9805\u306e\u6697\u9ed9\u306b\u5b9a\u7fa9\u3055\u308c\u308b\u30e1\u30bd\u30c3\u30c9\u3082\u5229\u7528\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<p>\u305d\u308c\u3067\u306f\u3001\u30b5\u30f3\u30d7\u30eb\u30bd\u30fc\u30b9\u306b\u5f93\u3063\u3066\u300cPrefectureEnum.java\u300d\u3068\u300cEnumMain.java\u300d\u3092\u66f4\u306b\u66f8\u304d\u63db\u3048\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<div class=\"Pre-title\">PrefectureEnum.java<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>public enum PrefectureEnum {\r\n\t\/\/ \u90fd\u9053\u5e9c\u770c\u30b3\u30fc\u30c9\u306e\u5024\u3092\u8ffd\u52a0\r\n\tFUKUOKA(40, \"\u798f\u5ca1\u770c\",\"5,101,556\"),\r\n\tSAGA(41, \"\u4f50\u8cc0\u770c\",\"832,832\"),\r\n\tNAGASAKI(42, \"\u9577\u5d0e\u770c\",\"1,377,187\"),\r\n\tKUMAMOTO(43, \"\u718a\u672c\u770c\",\"1,786,170\"),\r\n\tOITA(44, \"\u5927\u5206\u770c\",\"1,166,338\"),\r\n\tMIYAZAKI(45, \"\u5bae\u5d0e\u770c\",\"1,104,069\"),\r\n\tKAGOSHIMA(46, \"\u9e7f\u5150\u5cf6\u770c\",\"1,648,177\"),\r\n\tOKINAWA(47, \"\u6c96\u7e04\u770c\",\"1,433,566\");\r\n\r\n\t\/\/ \u90fd\u9053\u5e9c\u770c\u30b3\u30fc\u30c9\r\n\tprivate int prefectureCode;\r\n\t\/\/ \u90fd\u9053\u5e9c\u770c\u540d\r\n\tprivate String prefectureName;\r\n\t\/\/ \u4eba\u53e3\r\n\tprivate String population;\r\n\r\n\tprivate PrefectureEnum(int prefectureCode, String prefectureName, String population) {\r\n\t\tthis.prefectureCode = prefectureCode;\r\n\t\tthis.prefectureName = prefectureName;\r\n\t\tthis.population = population;\r\n\t}\r\n\r\n\t\/\/ Enum\u306b\u8a2d\u5b9a\u3055\u308c\u305f\u90fd\u9053\u5e9c\u770c\u30b3\u30fc\u30c9\u3092\u53d6\u5f97\u3059\u308b\r\n\tpublic int getPrefectureCode() {\r\n\t\treturn prefectureCode;\r\n\t}\r\n\t\/\/ Enum\u306b\u8a2d\u5b9a\u3055\u308c\u305f\u90fd\u9053\u5e9c\u770c\u540d\u3092\u53d6\u5f97\u3059\u308b\r\n\tpublic String getPrefectureName() {\r\n\t\treturn prefectureName;\r\n\t}\r\n\t\/\/ Enum\u306b\u8a2d\u5b9a\u3055\u308c\u305f\u4eba\u53e3\u3092\u53d6\u5f97\u3059\u308b\r\n\tpublic String getPopulation() {\r\n\t\treturn population;\r\n\t}\r\n\r\n\t\/**\r\n\t * \u5f15\u6570\u306e\u90fd\u9053\u5e9c\u770c\u30b3\u30fc\u30c9\u304b\u3089\u90fd\u9053\u5e9c\u770c\u540d\u3092\u53d6\u5f97\u3059\u308b\uff08\u8ffd\u52a0\u3057\u305f\u72ec\u81ea\u30e1\u30bd\u30c3\u30c9\uff09\r\n\t * @param prefectureCode \u90fd\u9053\u5e9c\u770c\u30b3\u30fc\u30c9\r\n\t * @return \u90fd\u9053\u5e9c\u770c\u540d\r\n\t *         \u5b58\u5728\u3057\u306a\u3044\u90fd\u9053\u5e9c\u770c\u30b3\u30fc\u30c9\u304c\u6307\u5b9a\u3055\u308c\u305f\u5834\u5408\u306fnull\r\n\t *\/\r\n\tpublic static String getPrefectureNameByCode(int prefectureCode) {\r\n\t\tPrefectureEnum[] array = values();\r\n\t\tfor(PrefectureEnum preEnum : array) {\r\n\t\t\tif (preEnum.prefectureCode == prefectureCode) {\r\n\t\t\t\treturn preEnum.prefectureName;\r\n\t\t\t}\r\n\t\t}\r\n\t\treturn null;\r\n\t}\r\n}<\/code><\/pre>\n<div class=\"Pre-title\">EnumMain.java<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>public class EnumMain {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\t\/\/ Enum\u300cFUKUOKA\u300d\u306e\u5217\u6319\u5b50\u306e\u540d\u524d\u3092\u51fa\u529b\r\n\t\tSystem.out.println(PrefectureEnum.FUKUOKA.name()); \/\/ FUKUOKA\r\n\r\n\t\t\/\/ Enum\u300cFUKUOKA\u300d\u306e\u90fd\u9053\u5e9c\u770c\u540d\u3092\u51fa\u529b\r\n\t\tSystem.out.println(PrefectureEnum.FUKUOKA.getPrefectureName()); \/\/ \u798f\u5ca1\u770c\r\n\r\n\t\t\/\/ \u90fd\u9053\u5e9c\u770c\u30b3\u30fc\u30c9\u304b\u3089Enum\u300cFUKUOKA\u300d\u306e\u90fd\u9053\u5e9c\u770c\u540d\u3092\u51fa\u529b\r\n\t\tSystem.out.println(PrefectureEnum.getPrefectureNameByCode(40)); \/\/ \u798f\u5ca1\u770c\r\n\t}\r\n}<\/code><\/pre>\n<div class=\"Pre-title\">\u5b9f\u884c\u7d50\u679c<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>FUKUOKA\r\n\u798f\u5ca1\u770c\r\n\u798f\u5ca1\u770c<\/code><\/pre>\n<p>\u4e0a\u8a18\u3067\u306f\u6697\u9ed9\u306b\u5b9a\u7fa9\u3055\u308c\u305f\u30e1\u30bd\u30c3\u30c9\u3001Enum\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30e1\u30bd\u30c3\u30c9\u3001PrefectureEnum\u306e\u30af\u30e9\u30b9\u30e1\u30bd\u30c3\u30c9\u305d\u308c\u305e\u308c\u304b\u3089\u5024\u306e\u51fa\u529b\u3092\u884c\u3063\u3066\u3044\u307e\u3059\u3002<br \/>\n\u305d\u308c\u305e\u308c1\u30641\u3064\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>System.out.println(PrefectureEnum.FUKUOKA.name());<\/code><\/pre>\n<p>Enum\u306b\u6697\u9ed9\u306b\u5b9a\u7fa9\u3055\u308c\u305fname\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u5217\u6319\u5b50\u306e\u540d\u524d\u3092\u53d6\u5f97\u3057\u3001\u30b3\u30f3\u30bd\u30fc\u30eb\u3078\u51fa\u529b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>System.out.println(PrefectureEnum.FUKUOKA.getPrefectureName());<\/code><\/pre>\n<p>\u3053\u308c\u307e\u3067\u540c\u69d8\u3001Enum\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066Enum\u306b\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u308b\u90fd\u9053\u5e9c\u770c\u540d\u3092\u53d6\u5f97\u3057\u3001\u30b3\u30f3\u30bd\u30fc\u30eb\u3078\u51fa\u529b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>System.out.println(PrefectureEnum.getPrefectureNameByCode(40));<\/code><\/pre>\n<p>\u3053\u3061\u3089\u306f\u3001PrefectureEnum\u306b\u5b9a\u7fa9\u3057\u305f\u72ec\u81ea\u306egetPrefectureNameByCode\u30e1\u30bd\u30c3\u30c9\u306b\u90fd\u9053\u5e9c\u770c\u30b3\u30fc\u30c9\u3092\u5f15\u6570\u3068\u3057\u3066\u6e21\u3057\u3001<br \/>\n\u305d\u306e\u90fd\u9053\u5e9c\u770c\u30b3\u30fc\u30c9\u3092\u6301\u3063\u305fEnum\u306e\u90fd\u9053\u5e9c\u770c\u540d\u3092\u53d6\u5f97\u3057\u3066\u30b3\u30f3\u30bd\u30fc\u30eb\u3078\u51fa\u529b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u90fd\u9053\u5e9c\u770c\u540d\u3092\u53d6\u5f97\u3059\u308bgetPrefectureNameByCode\u30e1\u30bd\u30c3\u30c9\u306e\u5185\u5bb9\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>public static String getPrefectureNameByCode(int prefectureCode) {\r\n\tPrefectureEnum[] array = values();\r\n\tfor(PrefectureEnum preEnum : array) {\r\n\t\tif (preEnum.prefectureCode == prefectureCode) {\r\n\t\t\treturn preEnum.prefectureName;\r\n\t\t}\r\n\t}\r\n\treturn null;\r\n}<\/code><\/pre>\n<p>\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u3067\u306f\u3001\u6700\u521d\u306b\u6697\u9ed9\u306b\u5b9a\u7fa9\u3055\u308c\u305f\u30e1\u30bd\u30c3\u30c9\u3067\u3042\u308bvalues\u30e1\u30bd\u30c3\u30c9\u3092\u5229\u7528\u3057\u3001PrefectureEnum\u30af\u30e9\u30b9\u3067\u5b9a\u7fa9\u3057\u305f\u5168\u3066\u306e\u5217\u6319\u5b50\u3092\u914d\u5217\u3067\u53d6\u5f97\u3057\u3066\u3044\u307e\u3059\u3002<br \/>\n\u305d\u306e\u5f8c\u3001\u53d6\u5f97\u3057\u305f\u914d\u5217\u8981\u7d20\u306e\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u3092\u884c\u3044\u3001\u305d\u306e\u4e2d\u3067\u5f15\u6570\u306e\u90fd\u9053\u5e9c\u770c\u30b3\u30fc\u30c9\u306b\u4e00\u81f4\u3057\u305f\u5024\u304c\u3042\u308b\u5834\u5408\u306b\u3001\u5bfe\u8c61\u3068\u306a\u308bEnum\u306e\u90fd\u9053\u5e9c\u770c\u540d\u3092\u8fd4\u5374\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>Enum\u306b\u95a2\u3059\u308b\u8aac\u660e\u306f\u4ee5\u4e0a\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<div class=\"Separator\">\n<div class=\"Separator__child\"><\/div>\n<\/div>\n<h3 class=\"Heading Title Title--m\" id=\"Bookmark-3\"><span class=\"Num\">3.<\/span>\u30e9\u30e0\u30c0\u5f0f<\/h3>\n<p>\u30e9\u30e0\u30c0\u5f0f\u3068\u306f\u3001\u95a2\u6570\u578b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u8003\u3048\u65b9\u3092\u3082\u3068\u306b\u5b9f\u73fe\u3055\u308c\u305f\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u8a18\u6cd5\u3067\u3059\u3002<br \/>\n\u3053\u306e\u5f8c\u5b66\u7fd2\u3059\u308bStream API\u3067\u3088\u304f\u5229\u7528\u3055\u308c\u307e\u3059\u306e\u3067\u3001\u30e9\u30e0\u30c0\u5f0f\u306e\u57fa\u672c\u7684\u306a\u69cb\u6587\u306b\u3064\u3044\u3066\u5b66\u7fd2\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<h4 class=\"Heading Title Title--s\" id=\"Bookmark-3-1\"><span class=\"Num\">3.1.<\/span>\u95a2\u6570\u578b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3068\u306f<\/h4>\n<p>\u95a2\u6570\u578b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3068\u306f\u3001\u95a2\u6570\u578b\u8a00\u8a9e\u3068\u547c\u3070\u308c\u308b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3067\u5229\u7528\u3055\u308c\u3066\u304d\u307e\u3057\u305f\u3002<br \/>\n\u300c\u95a2\u6570\u300d\u306f\u3001\u3053\u3053\u3067\u306f\u300c\u3042\u308b\u5165\u529b\u306b\u5bfe\u3057\u3066\u3001\u51fa\u529b\u304c1\u3064\u306b\u5b9a\u307e\u308b\u300d\u3053\u3068\u3092\u6307\u3057\u307e\u3059\u3002<br \/>\n\u3053\u306e\u8003\u3048\u65b9\u3092\u3082\u3068\u306b\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3059\u308b\u3053\u3068\u306b\u3088\u308a\u3001\u3088\u308a\u7c21\u6f54\u3067\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u3057\u3084\u3059\u3044\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>Java\u8a00\u8a9e\u3067\u306f\u3001\u300c\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u300d\u3092\u4f7f\u7528\u3057\u3066\u3001\u30e9\u30e0\u30c0\u5f0f\u3092\u8a18\u8ff0\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<h5 class=\"Heading Title Title--xs\" id=\"Bookmark-3-1-1\"><span class=\"Num\">3.1.1.<\/span>\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u57fa\u672c<\/h5>\n<p>\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3068\u306f\u3001\u300c\u30dd\u30ea\u30e2\u30d5\u30a3\u30ba\u30e0\u300d\u306e\u7ae0\u3067\u5b66\u7fd2\u3057\u305f\u3001\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e1\u3064\u3067\u3059\u3002<br \/>\n\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u7279\u5fb4\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul class=\"Base-list\">\n<li class=\"Base-list__child\">\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u30921\u3064\u3060\u3051\u6301\u3064<\/li>\n<li class=\"Base-list__child\">\u4e3b\u306b\u533f\u540d\u30af\u30e9\u30b9\u3067\u5229\u7528\u3055\u308c\u308b<\/li>\n<\/ul>\n<p>\u3067\u306f\u3001\uff12\u3064\u306e\u7279\u5fb4\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u8aac\u660e\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<h6 class=\"Heading Title Title--xxs\" id=\"Bookmark-3-1-1-1\"><span class=\"Num\">3.1.1.1.<\/span>\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u30921\u3064\u3060\u3051\u6301\u3064<\/h6>\n<div class=\"Pre-title\">Hello.java<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>@FunctionalInterface\r\npublic interface Hello {\r\n\tpublic String sayHello(String name); \/\/ \u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\r\n}<\/code><\/pre>\n<p>Hello\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306b\u3001sayHello\u3068\u3044\u3046\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u30921\u3064\u3060\u3051\u5b9a\u7fa9\u3057\u3066\u3044\u307e\u3059\u3002<br \/>\n\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306f\u3001\u3053\u306e\u3088\u3046\u306b\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u30921\u3064\u3060\u3051\u5b9a\u7fa9\u3057\u305f\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3067\u3059\u3002<\/p>\n<p>\u300c@FunctionalInterface\u300d\u306f\u300cFunctionalInterface\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u300d\u3068\u3044\u3044\u307e\u3059\u3002<br \/>\n\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3068\u306f\u300c\u6ce8\u91c8\u300d\u3068\u547c\u3070\u308c\u3001\u30e1\u30bd\u30c3\u30c9\u3084\u30af\u30e9\u30b9\u306b\u4ed8\u4e0e\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br \/>\n\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4ed8\u4e0e\u3057\u305f\u5834\u5408\u3001\u305d\u306e\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u306e\u898f\u5247\u306b\u5f93\u3063\u3066\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u66f8\u304f\u5fc5\u8981\u304c\u3042\u308a\u3001\u30b9\u30da\u30eb\u30df\u30b9\u3084\u30d0\u30b0\u306e\u767a\u751f\u3092\u9632\u6b62\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br \/>\n@FunctionalInterface\u3092\u4ed8\u3051\u308b\u3053\u3068\u306b\u3088\u308a\u3001\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u6761\u4ef6\u3092\u6e80\u305f\u3057\u3066\u3044\u306a\u3044\u5834\u5408\uff08\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u3092\u8907\u6570\u6301\u3064\u5834\u5408\u306a\u3069\uff09\u306b\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<h6 class=\"Heading Title Title--xxs\" id=\"Bookmark-3-1-1-2\"><span class=\"Num\">3.1.1.2.<\/span>\u4e3b\u306b\u533f\u540d\u30af\u30e9\u30b9\u3067\u5229\u7528\u3055\u308c\u308b<\/h6>\n<p>\u8907\u96d1\u306a\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u69cb\u7bc9\u3057\u3066\u3044\u304f\u3088\u3046\u306b\u306a\u308b\u3068\u3001\u30af\u30e9\u30b9\u9593\u3067\u4f7f\u3044\u307e\u308f\u3057\u305f\u308a\u305b\u305a\u3001\u305d\u306e\u5834\u3060\u3051\u3067\u4e00\u6642\u7684\u306b\u4f7f\u7528\u3057\u305f\u3044\u62bd\u8c61\u30af\u30e9\u30b9\u3084\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9f\u88c5\u3057\u305f\u30af\u30e9\u30b9\u304c\u5fc5\u8981\u306b\u306a\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<br \/>\n\u3053\u306e\u3088\u3046\u306a\u5834\u5408\u3001\u533f\u540d\u30af\u30e9\u30b9\u3068\u3044\u3046\u7279\u6b8a\u306a\u30af\u30e9\u30b9\u5b9a\u7fa9\u3092\u4f7f\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u533f\u540d\u30af\u30e9\u30b9\u306f\u3001\u4e00\u6642\u7684\u306b\u4f7f\u7528\u3059\u308b\u540d\u524d\uff08\u5909\u6570\u540d\uff09\u304c\u306a\u3044\u30af\u30e9\u30b9\u3068\u3057\u3066\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u69cb\u6587\u3067\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>new \u62bd\u8c61\u30af\u30e9\u30b9\u307e\u305f\u306f\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9() {\r\n\t\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u3092\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3057\u305f\u51e6\u7406\u306a\u3069\r\n};<\/code><\/pre>\n<p>\u306a\u304a\u3001\u533f\u540d\u30af\u30e9\u30b9\u306f\u7121\u540d\u30af\u30e9\u30b9\u3068\u3082\u547c\u3070\u308c\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h5 class=\"Heading Title Title--xs\" id=\"Bookmark-3-1-2\"><span class=\"Num\">3.1.2.<\/span>\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u5229\u7528<\/h5>\n<p>\u305d\u308c\u3067\u306f\u3001\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u5229\u7528\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<h6 class=\"Heading Title Title--xxs\" id=\"Bookmark-3-1-2-1\"><span class=\"Num\">3.1.2.1.<\/span>\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u5b9f\u88c5<\/h6>\n<p>\u307e\u305a\u306f\u3001\u4eca\u307e\u3067\u5b66\u7fd2\u3057\u3066\u304d\u305f\u65b9\u6cd5\u3067\u3001\u5148\u7a0b\u4f5c\u6210\u3057\u305fHello.java\u3092\u5229\u7528\u3057\u3066\u307f\u307e\u3059\u3002<br \/>\nHello\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092implements\u3057\u3066\u3001sayHello\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u88c5\u3057\u307e\u3059\u3002<\/p>\n<div class=\"Pre-title\">HelloImpl.java<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>public class HelloImpl implements Hello {\r\n\r\n\t\/\/ sayHello\u30e1\u30bd\u30c3\u30c9\u3092\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\r\n\tpublic String sayHello(String name) {\r\n\t\treturn \"Hello!\" + name;\r\n\t}\r\n}<\/code><\/pre>\n<p>HelloImpl\u30af\u30e9\u30b9\u3092\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\u3057\u3066\u3001sayHello\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u307e\u3059\u3002<\/p>\n<div class=\"Pre-title\">LambdaTest1.java<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>public class LambdaTest1 {\r\n\r\n\tpublic static void main(String[] args) {\r\n\r\n\t\tHello hello = new HelloImpl();\r\n\r\n\t\t\/\/ Hello!Tanaka\u306e\u8868\u793a\r\n\t\tSystem.out.println(hello.sayHello(\"Tanaka\"));\r\n\r\n\t}\r\n}<\/code><\/pre>\n<p>LambdaTest1\u30af\u30e9\u30b9\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<div class=\"Pre-title\">\u5b9f\u884c\u7d50\u679c<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>Hello!Tanaka<\/code><\/pre>\n<p>\u3053\u3053\u307e\u3067\u306f\u3001\u300c\u30dd\u30ea\u30e2\u30d5\u30a3\u30ba\u30e0\u300d\u306e\u7ae0\u306e\u5fa9\u7fd2\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u6b21\u306b\u3001\u533f\u540d\u30af\u30e9\u30b9\u3092\u5229\u7528\u3057\u305f\u5834\u5408\u306e\u5b9f\u88c5\u306e\u30b5\u30f3\u30d7\u30eb\u30bd\u30fc\u30b9\u306f\u3001\u4ee5\u4e0b\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<div class=\"Pre-title\">LambdaTest2.java<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>public class LambdaTest2 {\r\n\r\n\tpublic static void main(String[] args) {\r\n\r\n\t\tHello hello = new Hello() {\r\n\t\t\tpublic String sayHello(String name) {\r\n\t\t\t\treturn name + \"\u3055\u3093\u3001\u3053\u3093\u306b\u3061\u306f\uff01\u3053\u308c\u306f\u533f\u540d\u30af\u30e9\u30b9\u3067\u3059\uff01\";\r\n\t\t\t}\r\n\t\t};\r\n\r\n\t\tSystem.out.println(hello.sayHello(\"yamada\"));\r\n\r\n\t}\r\n}<\/code><\/pre>\n<div class=\"Pre-title\">\u5b9f\u884c\u7d50\u679c<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>yamada\u3055\u3093\u3001\u3053\u3093\u306b\u3061\u306f\uff01\u3053\u308c\u306f\u533f\u540d\u30af\u30e9\u30b9\u3067\u3059\uff01<\/code><\/pre>\n<p>hello\u5909\u6570\u3078\u306e\u4ee3\u5165\u6642\u306b\u3001\u3042\u305f\u304b\u3082Hello\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u751f\u6210\u3057\u3066\u3044\u308b\u3088\u3046\u306b\u898b\u3048\u307e\u3059\u304c\u3001 new<br \/>\nHello()\u306e\u3042\u3068\u306b{}\u304c\u3042\u308a\u3001\u305d\u306e\u4e2d\u3067sayHello\u30e1\u30bd\u30c3\u30c9\u3092\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3057\u3066\u3044\u307e\u3059\u3002<br \/>\n\u533f\u540d\u30af\u30e9\u30b9\u3092\u4f7f\u3063\u305f\u5b9f\u88c5\u65b9\u6cd5\u3067\u306f\u3001\u5148\u7a0b\u306eHelloImpl\u30af\u30e9\u30b9\u306e\u3088\u3046\u306a\u5b9f\u88c5\u30af\u30e9\u30b9\u304c\u4e0d\u8981\u3068\u306a\u308b\u305f\u3081\u3001\u4f7f\u3044\u307e\u308f\u3059\u5fc5\u8981\u304c\u7121\u3044\u5834\u5408\u306f\u3001\u7c21\u6f54\u306a\u30bd\u30fc\u30b9\u306b\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<h6 class=\"Heading Title Title--xxs\" id=\"Bookmark-3-1-2-2\"><span class=\"Num\">3.1.2.2.<\/span>\u30e9\u30e0\u30c0\u5f0f\u3092\u5229\u7528\u3057\u305f\u5b9f\u88c5<\/h6>\n<p>\u7d9a\u3044\u3066\u3001\u4e0a\u8a18\u306e\u533f\u540d\u30af\u30e9\u30b9\u3092\u4f7f\u3063\u305f\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u3001\u30e9\u30e0\u30c0\u5f0f\u3092\u4f7f\u3063\u3066\u66f8\u304d\u63db\u3048\u3066\u307f\u307e\u3059\u3002<\/p>\n<div class=\"Pre-title\">LambdaTest3.java<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>public class LambdaTest3 {\r\n\r\n\tpublic static void main(String[] args) {\r\n\r\n\t\t\/\/ Hello\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306esayHello\u30e1\u30bd\u30c3\u30c9\u306e\u51e6\u7406\u3092\u5b9f\u88c5\r\n\t\tHello hello = (String name) -&gt; {\r\n\t\t\treturn \"Hello!\" + name;\r\n\t\t};\r\n\r\n\t\t\/\/ Hello!Tanaka\u306e\u8868\u793a\r\n\t\tSystem.out.println(hello.sayHello(\"Tanaka\"));\r\n\t}\r\n}<\/code><\/pre>\n<p>\u898b\u6163\u308c\u306a\u3044\u66f8\u304d\u65b9\u306b\u6238\u60d1\u3046\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u304c\u3001\u51e6\u7406\u81ea\u4f53\u306f\u5148\u307b\u3069\u306e\u533f\u540d\u30af\u30e9\u30b9\u3092\u4f7f\u3063\u305f\u30b5\u30f3\u30d7\u30eb\u30bd\u30fc\u30b9\u3068\u4e00\u7dd2\u3067\u3059\u3002<br \/>\nHello\u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9\u306e\u5b9f\u88c5\u3068\u3001\u305d\u308c\u3092\u5229\u7528\u3057\u305f\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u540c\u6642\u306b1\u3064\u306e\u30af\u30e9\u30b9\u5185\u3067\u5b9f\u88c5\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u30e9\u30e0\u30c0\u5f0f\u306e\u57fa\u672c\u69cb\u6587\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u540d \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u540d = (\u5f15\u65701, \u5f15\u65702, \u30fb\u30fb\u30fb) -&gt; {return \u51e6\u7406\u5185\u5bb9;};<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u4f8b\u306b\u5f53\u3066\u306f\u3081\u3066\u307f\u308b\u3068\u3001\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u540d\u306f\u300cHello\u300d\u3001 \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u540d\u306f\u300chello\u300d\u3001\u5f15\u6570\u306f\u300cname\u300d\u3067\u3001{}\u5185\uff08\u30b3\u30fc\u30c9\u30d6\u30ed\u30c3\u30af\uff09\u304c\u51e6\u7406\u5185\u5bb9\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u300c->\u300d\u306f\u30a2\u30ed\u30fc\u6f14\u7b97\u5b50\u3068\u3082\u547c\u3070\u308c\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u4f7f\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>( \u5b9f\u88c5\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570 ) -&gt; { \u5177\u4f53\u7684\u306a\u51e6\u7406 };<\/code><\/pre>\n<p>\u30b5\u30f3\u30d7\u30eb\u3067\u306f\u3001\u5f15\u6570\u3068\u3057\u3066String\u578b\u306e\u5909\u6570name\u3092\u30b3\u30fc\u30c9\u30d6\u30ed\u30c3\u30af\u306b\u5f15\u304d\u6e21\u3057\u3066\u3044\u307e\u3059\u3002<br \/>\n\u300cHelloImpl.java\u300d\u3084\u533f\u540d\u30af\u30e9\u30b9\u306e\u5b9f\u88c5\u90e8\u5206\u306b\u5f53\u3066\u306f\u3081\u308b\u3068\u3001\u300csayHello(String name) { \u30fb\u30fb\u30fb }\u300d\u306e\u300cString name\u300d\u90e8\u5206\u306b\u3042\u305f\u308a\u307e\u3059\u3002<\/p>\n<p>\u306a\u304a\u3001\u4e0a\u8a18\u306e\u30b5\u30f3\u30d7\u30eb\u306e\u3088\u3046\u306b\u5b9f\u88c5\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u304c1\u3064\u3060\u3051\u306e\u5834\u5408\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u5f15\u6570\u306e\u578b\u3068\u3001()\u3092\u7701\u7565\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>Hello hello = name -&gt; {\r\n\treturn \"Hello!\" + name;\r\n};<\/code><\/pre>\n<p>\u3055\u3089\u306b\u3001\u51e6\u7406\u304c1\u884c\u3067\u5b8c\u7d50\u3059\u308b\u3088\u3046\u306a\u5358\u6587\u306e\u5834\u5408\u306f\u3001return\u3068{}\u3082\u7701\u7565\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>Hello hello = name -&gt; \"Hello!\" + name;<\/code><\/pre>\n<p>\u3053\u306e\u3088\u3046\u306b\u3001\u30e9\u30e0\u30c0\u5f0f\u3092\u4f7f\u3046\u3053\u3068\u3067\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u3055\u3089\u306b\u7c21\u6f54\u306b\u8a18\u8ff0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n<div class=\"Separator\">\n<div class=\"Separator__child\"><\/div>\n<\/div>\n<h3 class=\"Heading Title Title--m\" id=\"Bookmark-4\"><span class=\"Num\">4.<\/span>Stream API<\/h3>\n<p>Stream API\u306f\u3001Java 8\u3088\u308a\u5c0e\u5165\u3055\u308c\u307e\u3057\u305f\u3002<br \/>\n\u3053\u308c\u307e\u3067\u306e\u5b66\u7fd2\u3067\u306f\u3001\u914d\u5217\u3084\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306b\u5bfe\u3057\u3066\u3001for\u6587\u306a\u3069\u306e\u7e70\u308a\u8fd4\u3057\u6587\u3092\u7528\u3044\u3066\u3001\u69d8\u3005\u306a\u51e6\u7406\u3092\u884c\u3063\u3066\u304d\u307e\u3057\u305f\u304c\u3001<br \/>\nStream API\u3092\u4f7f\u3046\u3053\u3068\u3067\u3001\u914d\u5217\u3084\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306a\u3069\u306e\u30c7\u30fc\u30bf\u306e\u96c6\u5408\u306b\u5bfe\u3059\u308b\u51e6\u7406\u3092\u7c21\u6f54\u306b\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u3053\u3067\u306f\u3001Stream API\u306e\u57fa\u672c\u7684\u306a\u69cb\u6587\u306b\u3064\u3044\u3066\u5b66\u7fd2\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<h4 class=\"Heading Title Title--s\" id=\"Bookmark-4-1\"><span class=\"Num\">4.1.<\/span>Stream API\u3068\u306f<\/h4>\n<p>\u4e0a\u8ff0\u3057\u305f\u3088\u3046\u306b\u3001\u914d\u5217\u3084\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306a\u3069\u306e\u30c7\u30fc\u30bf\u306e\u96c6\u5408\u306b\u5bfe\u3057\u3066\u3001\u96c6\u8a08\u3001\u691c\u7d22\u3001\u30c7\u30fc\u30bf\u62bd\u51fa\u306a\u3069\u3092\u884c\u3046API\u3067\u3059\u3002<br \/>\nAPI\u3068\u306f\u300cApplication Programming Interface\uff08\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30fb\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30fb\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\uff09\u300d\u306e\u7565\u8a9e\u3067\u3001<br \/>\n\u300c\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u69d8\u3005\u306a\u6a5f\u80fd\u3092\u5171\u6709\u3059\u308b\u305f\u3081\u306e\u4ed5\u7d44\u307f\u300d\u306e\u3088\u3046\u306a\u30a4\u30e1\u30fc\u30b8\u3067\u3059\u3002<br \/>\nStream API\u306e\u4ed5\u7d44\u307f\u3092\u5229\u7528\u3057\u3066\u3001\u914d\u5217\u3084\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306a\u3069\u306b\u5bfe\u3057\u3066\u3001\u69d8\u3005\u306a\u64cd\u4f5c\u3092\u884c\u3063\u3066\u3044\u304f\u3068\u3044\u3063\u305f\u6d41\u308c\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>Stream API\u306b\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u7279\u5fb4\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul class=\"Base-list\">\n<li class=\"Base-list__child\">\u539f\u5247\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u306b\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u5b9f\u88c5\u30af\u30e9\u30b9\u3092\u3068\u308b<\/li>\n<li class=\"Base-list__child\">Stream\u306e\u30e1\u30bd\u30c3\u30c9\u3067\u306f\u8981\u7d20\u306b\u5bfe\u3059\u308b\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u3092\u5b9f\u884c\u3059\u308b\u524d\u63d0\u3068\u306a\u308b<\/li>\n<\/ul>\n<h5 class=\"Heading Title Title--xs\" id=\"Bookmark-4-1-1\"><span class=\"Num\">4.1.1.<\/span>Stream API\u306e\u57fa\u672c<\/h5>\n<p>\u305d\u308c\u3067\u306f\u3001Stream API\u306e\u57fa\u672c\u69cb\u6587\u306b\u3064\u3044\u3066\u3001\u30b5\u30f3\u30d7\u30eb\u30bd\u30fc\u30b9\u3092\u898b\u306a\u304c\u3089\u78ba\u8a8d\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<br \/>\n\u4ee5\u4e0b\u306f\u3001\u300cs\u300d\u304b\u3089\u59cb\u307e\u308b\u540d\u524d\u3060\u3051\u3092\u62bd\u51fa\u3057\u3001\u51fa\u529b\u3059\u308b\u30b5\u30f3\u30d7\u30eb\u3067\u3059\u3002<\/p>\n<p>\u307e\u305a\u306fStream API\u3092\u4f7f\u308f\u306a\u3044\u5834\u5408\u306b\u3064\u3044\u3066\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<div class=\"Pre-title\">StreamTest1.java<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>import java.util.ArrayList;\r\nimport java.util.Arrays;\r\nimport java.util.List;\r\n\r\npublic class StreamTest1 {\r\n\r\n\tpublic static void main(String[] args) {\r\n\r\n\t\t\/\/ String\u578b\u914d\u5217\u306e\u751f\u6210\u3068\u3001\u8981\u7d20\u306e\u4ee3\u5165\r\n\t\tfinal String[] data = { \"shimizu\", \"tanaka\", \"sasaki\", \"suzaki\" };\r\n\r\n\t\t\/\/ \u914d\u5217\u3092String\u578b\u306eList\u306b\u5909\u63db\r\n\t\tList&lt;String&gt; list = Arrays.asList(data);\r\n\r\n\t\t\/\/ \u7d50\u679c\u3092\u683c\u7d0d\u3059\u308bList\u306e\u7528\u610f\r\n\t\tList&lt;String&gt; outputList = new ArrayList&lt;String&gt;();\r\n\r\n\t\t\/\/ list\u306e\u8981\u7d20\u3092\u62e1\u5f35for\u6587\u3067\u53d6\u308a\u51fa\u3057\u3001\u300cs\u300d\u304b\u3089\u59cb\u307e\u308b\u8981\u7d20\u306e\u307f\r\n\t\t\/\/ outputList\u306b\u683c\u7d0d\r\n\t\tfor (String name : list) {\r\n\t\t\tif (name.startsWith(\"s\")) {\r\n\t\t\t\toutputList.add(name);\r\n\t\t\t}\r\n\t\t}\r\n\r\n\t\t\/\/ \u30b3\u30f3\u30bd\u30fc\u30eb\u51fa\u529b\r\n\t\tfor (String str : outputList) {\r\n\t\t\tSystem.out.println(str);\r\n\t\t}\r\n\t}\r\n}<\/code><\/pre>\n<p>\u307e\u305a\u3001\u540d\u524d\u306e\u5165\u3063\u305f\u914d\u5217\u3092\u751f\u6210\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>\/\/ String\u578b\u914d\u5217\u306e\u751f\u6210\u3068\u3001\u8981\u7d20\u306e\u4ee3\u5165\r\nfinal String[] data = { \"shimizu\", \"tanaka\", \"sasaki\", \"suzaki\" };<\/code><\/pre>\n<p>\u6b21\u306b\u3001Arrays.asList(data)\u3067\u3001\u914d\u5217\u3092List\u306b\u5909\u63db\u3057\u3066\u3044\u307e\u3059\u3002<br \/>\n\u914d\u5217\u306e\u307e\u307e\u3067\u3082\u554f\u984c\u3042\u308a\u307e\u305b\u3093\u304c\u3001\u5f8c\u307b\u3069\u306eStream API\u3092\u4f7f\u3063\u305f\u5834\u5408\u306e\u8aac\u660e\u306e\u305f\u3081\u306b\u3001List\u306b\u5909\u63db\u3092\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>\/\/ \u914d\u5217\u3092String\u578b\u306eList\u306b\u5909\u63db\r\nList&lt;String&gt; list = Arrays.asList(data);<\/code><\/pre>\n<p>\u305d\u3057\u3066\u3001\u62e1\u5f35for\u6587\u3092\u7528\u3044\u3066\u8981\u7d20\u30921\u30641\u3064\u53d6\u308a\u51fa\u3057\u3001\u6761\u4ef6\u306b\u5408\u81f4\u3059\u308b\u8981\u7d20\u306e\u307foutputList\u306badd\u3057\u3066\u3044\u307e\u3059\u3002<br \/>\n\u7d50\u679c\u306b\u3064\u3044\u3066\u3082\u3001\u62e1\u5f35for\u6587\u3092\u4f7f\u3063\u3066\u3001\u51fa\u529b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u3067\u306f\u3001\u4f5c\u6210\u3057\u305f\u30b5\u30f3\u30d7\u30eb\u30bd\u30fc\u30b9\u3092\u3001Stream API\u3092\u4f7f\u3063\u3066\u66f8\u304d\u63db\u3048\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<div class=\"Pre-title\">StreamTest2.java<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>import java.util.Arrays;\r\nimport java.util.List;\r\n\r\npublic class StreamTest2 {\r\n\r\n\tpublic static void main(String[] args) {\r\n\r\n\t\t\/\/ String\u578b\u914d\u5217\u306e\u751f\u6210\u3068\u3001\u8981\u7d20\u306e\u4ee3\u5165\r\n\t\tfinal String[] data = { \"shimizu\", \"tanaka\", \"sasaki\", \"suzaki\" };\r\n\r\n\t\t\/\/ \u914d\u5217\u3092String\u578b\u306eList\u306b\u5909\u63db\r\n\t\tList&lt;String&gt; list = Arrays.asList(data);\r\n\r\n\t\t\/\/ Stream\u3092\u751f\u6210\u3057\u3001\u300cs\u300d\u304b\u3089\u59cb\u307e\u308b\u8981\u7d20\u3060\u3051\u3092\u62bd\u51fa\u3057\u3066\u51fa\u529b\r\n\t\tlist.stream().filter(name -&gt; name.startsWith(\"s\")).forEach(str -&gt; System.out.println(str));\r\n\t}\r\n}<\/code><\/pre>\n<p>\u3053\u3061\u3089\u306b\u3064\u3044\u3066\u3082\u3001\u4e0a\u304b\u3089\u9806\u306b\u51e6\u7406\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>\/\/ String\u578b\u914d\u5217\u306e\u751f\u6210\u3068\u3001\u8981\u7d20\u306e\u4ee3\u5165\r\nfinal String[] data = { \"shimizu\", \"tanaka\", \"sasaki\", \"suzaki\" };\r\n\r\n\/\/ \u914d\u5217\u3092String\u578b\u306eList\u306b\u5909\u63db\r\nList&lt;String&gt; list = Arrays.asList(data);<\/code><\/pre>\n<p>\u3053\u3053\u307e\u3067\u306f\u3001\u5148\u307b\u3069\u306e\u30b5\u30f3\u30d7\u30eb\u3068\u307e\u3063\u305f\u304f\u540c\u69d8\u3067\u3059\u3002<\/p>\n<p>\u7570\u306a\u308b\u306e\u306f\u6b21\u306e1\u884c\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>list.stream().filter(name -&gt; name.startsWith(\"s\")).forEach(str -&gt; System.out.println(str));<\/code><\/pre>\n<p>Stream API\u306b\u7f6e\u304d\u63db\u3048\u305f\u5834\u5408\u3001\u62e1\u5f35for\u6587\u3092\u7528\u3044\u3066\u5b9f\u88c5\u3057\u3066\u3044\u305f\u4ee5\u4e0b\u306e\u51e6\u7406\u304c\u3001\u3053\u306e1\u884c\u306b\u3066\u5b9f\u884c\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<ul class=\"Base-list\">\n<li class=\"Base-list__child\">\u6761\u4ef6\u306b\u5408\u81f4\u3059\u308b\u8981\u7d20\u306e\u307f\u62bd\u51fa<\/li>\n<li class=\"Base-list__child\">\u30b3\u30f3\u30bd\u30fc\u30eb\u3078\u306e\u51fa\u529b<\/li>\n<\/ul>\n<p>\u3053\u3061\u3089\u306b\u3064\u3044\u3066\u3001\u4ee5\u964d\u3067\u8a73\u3057\u304f\u8aac\u660e\u3092\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<h4 class=\"Heading Title Title--s\" id=\"Bookmark-4-2\"><span class=\"Num\">4.2.<\/span>\u4e2d\u9593\u64cd\u4f5c\u3068\u7d42\u7aef\u64cd\u4f5c<\/h4>\n<p>Stream API\u306f\u3001\u57fa\u672c\u7684\u306b\u300c\u4e2d\u9593\u64cd\u4f5c\u300d\u3068\u300c\u7d42\u7aef\u64cd\u4f5c\u300d\u3068\u3044\u3046Stream\u306b\u5bfe\u3059\u308b\u64cd\u4f5c\u3092\u4f7f\u3063\u3066\u51e6\u7406\u3092\u8a18\u8ff0\u3057\u307e\u3059\u3002<br \/>\nStream\u3092\u751f\u6210\u3057\u3001\u305d\u308c\u306b\u5bfe\u3057\u3066\u3044\u304f\u3064\u3082\u306e\u4e2d\u9593\u64cd\u4f5c\u3092\u884c\u3044\u307e\u3059\u3002<\/p>\n<p>\u4e2d\u9593\u64cd\u4f5c\u306e\u7d50\u679c\u3092\u6b21\u306e\u4e2d\u9593\u64cd\u4f5c\u306b\u5f15\u304d\u6e21\u3057\u3001\u6700\u7d42\u7684\u306b\u7d42\u7aef\u64cd\u4f5c\u306b\u7d50\u679c\u3092\u5f15\u304d\u6e21\u3057\u3066\u51e6\u7406\u3092\u3057\u307e\u3059\u3002<br \/>\n\u5148\u307b\u3069\u306e\u30b5\u30f3\u30d7\u30eb\u30bd\u30fc\u30b9\u306e\u5834\u5408\u3001\u300cs\u300d\u304b\u3089\u59cb\u307e\u308b\u8981\u7d20\u3092\u62bd\u51fa\u3059\u308b\u51e6\u7406\u304c\u4e2d\u9593\u64cd\u4f5c\u306b\u3042\u305f\u308a\u307e\u3059\u3002<br \/>\n\u307e\u305f\u3001\u4f8b\u3048\u3070\u4e26\u3079\u66ff\u3048\uff08\u30bd\u30fc\u30c8\uff09\u3084\u8981\u7d20\u306e\u5909\u63db\u306a\u3069\u3001\u69d8\u3005\u306a\u51e6\u7406\u3092\u4e2d\u9593\u64cd\u4f5c\u3067\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u4e2d\u9593\u64cd\u4f5c\u3068\u7d42\u7aef\u64cd\u4f5c\u306b\u3064\u3044\u3066\u3001\u5148\u307b\u3069\u306e\u30b5\u30f3\u30d7\u30eb\u30bd\u30fc\u30b9\u3067\u78ba\u8a8d\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>list.stream().filter(name -&gt; name.startsWith(\"s\")).forEach(str -&gt; System.out.println(str));<\/code><\/pre>\n<p>\u3053\u306e1\u884c\u3067\u300cStream\u306e\u751f\u6210\u300d\u3001\u300c\u4e2d\u9593\u64cd\u4f5c\u300d\u3001\u300c\u7d42\u7aef\u64cd\u4f5c\u300d\u3092\u5b9f\u884c\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>1\u3064\u305a\u3064\u5206\u89e3\u3057\u3066\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<br \/>\n\u307e\u305a\u306f\u3001List\u578b\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304b\u3089Stream\u3092\u751f\u6210\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>list.stream()<\/code><\/pre>\n<p>\u7d9a\u3044\u3066\u3001\u751f\u6210\u3057\u305fStream\u3092\u53d7\u3051\u53d6\u3063\u3066\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u300c\u4e2d\u9593\u64cd\u4f5c\u300d\u3092\u884c\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>filter(name -&gt; name.startsWith(\"s\"))<\/code><\/pre>\n<p>\u6700\u5f8c\u306b\u3001\u300c\u4e2d\u9593\u64cd\u4f5c\u300d\u306e\u7d50\u679c\u3092\u53d7\u3051\u53d6\u308a\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u300c\u7d42\u7aef\u64cd\u4f5c\u300d\u3092\u884c\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>forEach(str -&gt; System.out.println(str))<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u5185\u5bb9\u3092\u8e0f\u307e\u3048\u306a\u304c\u3089\u3001\u4ee5\u964d\u306e\u7bc0\u3067\u4e2d\u9593\u64cd\u4f5c\u3001\u7d42\u7aef\u64cd\u4f5c\u305d\u308c\u305e\u308c\u306b\u3064\u3044\u3066\u9806\u756a\u306b\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<h5 class=\"Heading Title Title--xs\" id=\"Bookmark-4-2-1\"><span class=\"Num\">4.2.1.<\/span>\u4e2d\u9593\u64cd\u4f5c\uff08filter\uff09<\/h5>\n<p>\u30b5\u30f3\u30d7\u30eb\u3067\u306f\u3001filter\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3044\u300cs\u300d\u304b\u3089\u59cb\u307e\u308b\u8981\u7d20\u306e\u307f\u3092\u53d6\u5f97\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>filter(name -&gt; name.startsWith(\"s\"))<\/code><\/pre>\n<p>filter\u30e1\u30bd\u30c3\u30c9\u306b\u306f\u3001\u5f15\u6570\u3068\u3057\u3066\u30e9\u30e0\u30c0\u5f0f\u3067\u6e21\u3059\u5fc5\u8981\u304c\u3042\u308a\u3001\u3053\u306e\u30e9\u30e0\u30c0\u5f0f\u304c\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u5b9f\u88c5\u30af\u30e9\u30b9\u3068\u306a\u308a\u307e\u3059\u3002<br \/>\n\u3053\u3053\u3067\u306e\u51e6\u7406\u306e\u30a4\u30e1\u30fc\u30b8\u3068\u3057\u3066\u306f\u3001<\/p>\n<ol class=\"Base-list Base-list--ol\">\n<li class=\"Base-list__child\">\n\t\t\u683c\u7d0d\u3055\u308c\u3066\u3044\u308b\u8981\u7d20\u30921\u3064\u305a\u3064\u53d6\u308a\u51fa\u3057\u3001\u53d6\u308a\u51fa\u3057\u305f\u8981\u7d20\u3092\u5f15\u6570name\u306b\u5f15\u304d\u6e21\u3057\u3066\u3001startsWith(&quot;s&quot;)\u51e6\u7406\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002\n\t<\/li>\n<li class=\"Base-list__child\">\n\t\t\u5b9f\u884c\u7d50\u679c\u304ctrue\u306e\u8981\u7d20\u3092\u6b8b\u3057\u3001false\u306e\u3082\u306e\u3092\u524a\u304e\u843d\u3068\u3057\u307e\u3059\u3002\n\t<\/li>\n<\/ol>\n<p>\u3068\u306a\u308a\u3001\u305d\u306e\u7d50\u679c\u3001\u300cs\u300d\u304b\u3089\u59cb\u307e\u308b\u540d\u524d\u306e\u8981\u7d20\u304c\u62bd\u51fa\u3055\u308c\u307e\u3059\u3002<\/p>\n<h5 class=\"Heading Title Title--xs\" id=\"Bookmark-4-2-2\"><span class=\"Num\">4.2.2.<\/span>\u7d42\u7aef\u64cd\u4f5c\uff08foreach\uff09<\/h5>\n<p>forEach\u30e1\u30bd\u30c3\u30c9\u3082filter\u30e1\u30bd\u30c3\u30c9\u3068\u540c\u69d8\u3001\u30e9\u30e0\u30c0\u5f0f\u3092\u5f15\u6570\u306b\u53d6\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>forEach(str -&gt; System.out.println(str))<\/code><\/pre>\n<p>\u4e2d\u9593\u64cd\u4f5c\u304b\u3089\u53d7\u3051\u53d6\u3063\u305fStream\u306e\u8981\u7d20\u30921\u3064\u305a\u3064\u53d6\u308a\u51fa\u3057\u3066\u64cd\u4f5c\u3092\u884c\u3046\u305f\u3081\u3001\u62e1\u5f35for\u6587\u306e\u3088\u3046\u306b\u7e70\u308a\u8fd4\u3057\u64cd\u4f5c\u3092\u5b9f\u884c\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br \/>\n\u4e0a\u8a18\u306e\u30b5\u30f3\u30d7\u30eb\u306e\u5834\u5408\u306f\u3001forEach\u30e1\u30bd\u30c3\u30c9\u3067\u8981\u7d20\u3092\u53d6\u308a\u51fa\u3057\u306a\u304c\u3089\u30b3\u30f3\u30bd\u30fc\u30eb\u51fa\u529b\u3092\u884c\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u306a\u304a\u3001\u30af\u30e9\u30b9\u30e1\u30bd\u30c3\u30c9\u3084\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30e1\u30bd\u30c3\u30c9\u3092\u30e9\u30e0\u30c0\u5f0f\u306e\u51e6\u7406\u5b9f\u88c5\u90e8\u5206\u306b\u8a18\u8ff0\u3059\u308b\u5834\u5408\u3001\u7701\u7565\u3057\u3066\u8a18\u8ff0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>\/\/ \u30af\u30e9\u30b9\u30e1\u30bd\u30c3\u30c9\u306e\u5834\u5408\r\n\u30af\u30e9\u30b9\u540d::\u30e1\u30bd\u30c3\u30c9\u540d\r\n\r\n\/\/ \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30e1\u30bd\u30c3\u30c9\u306e\u5834\u5408\r\n\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u540d::\u30e1\u30bd\u30c3\u30c9\u540d<\/code><\/pre>\n<p>\u305d\u306e\u305f\u3081\u3001\u4e0a\u8a18\u306eforEach\u306e\u90e8\u5206\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u8a18\u8ff0\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>\/\/ forEach(str -&gt; System.out.println(str))\r\n\/\/ \u2193 \u4ee5\u4e0b\u306b\u3057\u3066\u3082\u540c\u3058\u7d50\u679c\u306b\u306a\u308a\u307e\u3059\u3002\r\nforEach(System.out::println)<\/code><\/pre>\n<p>forEach\u30e1\u30bd\u30c3\u30c9\u3067\u8981\u7d20\u3092\u51fa\u529b\u3059\u308b\u5834\u5408\u3001\u3053\u3061\u3089\u306e\u8a18\u8ff0\u306e\u65b9\u304c\u591a\u304f\u4f7f\u308f\u308c\u308b\u305f\u3081\u3001\u899a\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u4ee5\u4e0a\u306e\u3088\u3046\u306b\u3001\u30e9\u30e0\u30c0\u5f0f\u3068Stream API\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306b\u5bfe\u3059\u308b\u69d8\u3005\u306a\u64cd\u4f5c\u3092\u7c21\u6f54\u306b\u8a18\u8ff0\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n<h5 class=\"Heading Title Title--xs\" id=\"Bookmark-4-2-3\"><span class=\"Num\">4.2.3.<\/span>\u305d\u306e\u4ed6\u306e\u4e2d\u9593\u64cd\u4f5c<\/h5>\n<p>\u4e2d\u9593\u64cd\u4f5c\u306b\u306f\u3001filter\u30e1\u30bd\u30c3\u30c9\u306e\u4ed6\u306b\u3082\u69d8\u3005\u306a\u30e1\u30bd\u30c3\u30c9\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\u306e\u3067\u3001\u3044\u304f\u3064\u304b\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<h6 class=\"Heading Title Title--xxs\" id=\"Bookmark-4-2-3-1\"><span class=\"Num\">4.2.3.1.<\/span>map<\/h6>\n<p>map\u30e1\u30bd\u30c3\u30c9\u306fStream\u306e\u5185\u5bb9\u3092\u5909\u63db\u3059\u308b\u4e2d\u9593\u64cd\u4f5c\u306b\u306a\u308a\u307e\u3059\u3002<br \/>\nfilter\u30e1\u30bd\u30c3\u30c9\u3068\u540c\u69d8\u306b\u591a\u304f\u5229\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u5177\u4f53\u7684\u306a\u66f8\u304d\u65b9\u306b\u3064\u3044\u3066\u306f\u3001\u524d\u9805\u306e\u30b5\u30f3\u30d7\u30eb\u30bd\u30fc\u30b9\u3092\u5143\u306b\u66f8\u304d\u63db\u3048\u3066\u78ba\u8a8d\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<div class=\"Pre-title\">StreamTest3.java<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>import java.util.Arrays;\r\nimport java.util.List;\r\n\r\npublic class StreamTest3 {\r\n\r\n\tpublic static void main(String[] args) {\r\n\r\n\t\t\/\/ String\u578b\u914d\u5217\u306e\u751f\u6210\u3068\u3001\u8981\u7d20\u306e\u4ee3\u5165\r\n\t\tfinal String[] data = { \"shimizu\", \"tanaka\", \"sasaki\", \"suzaki\" };\r\n\r\n\t\t\/\/ \u914d\u5217\u3092String\u578b\u306eList\u306b\u5909\u63db\r\n\t\tList&lt;String&gt; list = Arrays.asList(data);\r\n\r\n\t\t\/\/ \uff08\u66f8\u304d\u63db\u3048\u90e8\u5206\uff09\r\n\t\t\/\/ Stream\u3092\u751f\u6210\u3057\u3001\u4e8b\u524d\u306b\u4ee3\u5165\u3057\u305fString\u578b\u306e\u5404\u8981\u7d20\u306e\u672b\u5c3e\u306b\u300ctaro\u300d\u3092\u4ed8\u4e0e\u3057\u3066\u51fa\u529b\r\n\t\tlist.stream().map(strData -&gt; strData + \" taro\").forEach(System.out::println);\r\n\t}\r\n}<\/code><\/pre>\n<div class=\"Pre-title\">\u5b9f\u884c\u7d50\u679c<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>shimizu taro\r\ntanaka taro\r\nsasaki taro\r\nsuzaki taro<\/code><\/pre>\n<p>\u524d\u9805\u306e\u300cStreamTest2.java\u300d\u3067\u306f\u4e2d\u9593\u64cd\u4f5c\u306b\u306ffilter\u3092\u5229\u7528\u3057\u3066\u3044\u307e\u3057\u305f\u304c\u3001\u305d\u308c\u3092map\u306b\u5909\u66f4\u3057\u307e\u3057\u305f\u3002<br \/>\n\u307e\u305f\u3001forEach\u30e1\u30bd\u30c3\u30c9\u306e\u51fa\u529b\u90e8\u5206\u306e\u8a18\u8ff0\u3082\u5909\u66f4\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>list.stream().map(strData -&gt; strData + \" taro\").forEach(System.out::println);<\/code><\/pre>\n<p>\u3053\u3061\u3089\u3067\u306f\u3001Stream\u304b\u3089\u53d6\u5f97\u3067\u304d\u308b\u8981\u7d20\u5168\u3066\u306b\u5bfe\u3057\u3066\u3001\u672b\u5c3e\u306b\u300ctaro\u300d\u306e\u6587\u5b57\u3092\u4ed8\u4e0e\u3059\u308b\u5f62\u3067\u306e\u5024\u5909\u63db\u3092\u884c\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u4e2d\u9593\u64cd\u4f5c\u306f\u8907\u6570\u7d44\u307f\u8fbc\u3080\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002<br \/>\n\u524d\u9805\u306e\u300cStreamTest2.java\u300d\u3067\u306f\u300c\u300cs\u300d\u304b\u3089\u59cb\u307e\u308b\u8981\u7d20\u3060\u3051\u3092\u62bd\u51fa\u300d\u3068\u3044\u3046\u4e2d\u9593\u64cd\u4f5c\u3092\u884c\u3063\u3066\u3044\u307e\u3057\u305f\u304c\u3001<br \/>\n\u4eca\u56de\u306e\u4e2d\u9593\u64cd\u4f5c\u3068\u4f75\u305b\u3066\u4e0b\u8a18\u306e\u3088\u3046\u306a\u5b9f\u88c5\u3082\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>\/\/ \u300cs\u300d\u304b\u3089\u59cb\u307e\u308b\u8981\u7d20\u3060\u3051\u3092\u62bd\u51fa\u3057\u3001\u62bd\u51fa\u3057\u305f\u5404\u8981\u7d20\u306e\u672b\u5c3e\u306b\u300ctaro\u300d\u3092\u4ed8\u4e0e\u3057\u3066\u51fa\u529b\r\nlist.stream().filter(name -&gt; name.startsWith(\"s\")).map(s -&gt; s + \" taro\").forEach(System.out::println);<\/code><\/pre>\n<div class=\"Pre-title\">\u5b9f\u884c\u7d50\u679c<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>shimizu taro\r\nsasaki taro\r\nsuzaki taro<\/code><\/pre>\n<p>\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u3001\u8907\u6570\u306e\u4e2d\u9593\u64cd\u4f5c\u3092\u7d44\u307f\u8fbc\u3093\u3067\u3044\u304f\u3068\u826f\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n<h6 class=\"Heading Title Title--xxs\" id=\"Bookmark-4-2-3-2\"><span class=\"Num\">4.2.3.2.<\/span>sorted<\/h6>\n<p>sorted\u30e1\u30bd\u30c3\u30c9\u306f\u3001Stream\u306e\u5185\u5bb9\u3092\u4e26\u3073\u66ff\u3048\u308b\u4e2d\u9593\u64cd\u4f5c\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>map\u3068\u540c\u69d8\u306b\u3001\u524d\u9805\u306e\u30b5\u30f3\u30d7\u30eb\u30bd\u30fc\u30b9\u3092\u5143\u306b\u66f8\u304d\u63db\u3048\u3066\u78ba\u8a8d\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<div class=\"Pre-title\">StreamTest4.java<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>import java.util.Arrays;\r\nimport java.util.List;\r\n\r\npublic class StreamTest4 {\r\n\r\n\tpublic static void main(String[] args) {\r\n\r\n\t\t\/\/ String\u578b\u914d\u5217\u306e\u751f\u6210\u3068\u3001\u8981\u7d20\u306e\u4ee3\u5165\r\n\t\tfinal String[] data = { \"shimizu\", \"tanaka\", \"sasaki\", \"suzaki\" };\r\n\r\n\t\t\/\/ \u914d\u5217\u3092String\u578b\u306eList\u306b\u5909\u63db\r\n\t\tList&lt;String&gt; list = Arrays.asList(data);\r\n\r\n\t\t\/\/ \uff08\u66f8\u304d\u63db\u3048\u90e8\u5206\uff09\r\n\t\t\/\/ Stream\u3092\u751f\u6210\u3057\u3001Stream\u306e\u5185\u5bb9\u3092\u6607\u9806\u306b\u4e26\u3073\u66ff\u3048\r\n\t\tlist.stream().sorted().forEach(System.out::println);\r\n\t}\r\n}<\/code><\/pre>\n<div class=\"Pre-title\">\u5b9f\u884c\u7d50\u679c<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>sasaki\r\nshimizu\r\nsuzaki\r\ntanaka<\/code><\/pre>\n<p>sorted\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u306b\u3088\u308a\u3001\u6607\u9806\u3067\u306e\u4e26\u3073\u66ff\u3048\u304c\u53ef\u80fd\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>list.stream().sorted()<\/code><\/pre>\n<p>\u307e\u305f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306bsorted\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u306bComparator.reverseOrder()\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u964d\u9806\u3078\u306e\u4e26\u3073\u66ff\u3048\u3082\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>list.stream().sorted(Comparator.reverseOrder())<\/code><\/pre>\n<p>\u3053\u3061\u3089\u3067\u5b9f\u884c\u3057\u305f\u5834\u5408\u306e\u7d50\u679c\u304c\u4e0b\u8a18\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<div class=\"Pre-title\">\u5b9f\u884c\u7d50\u679c<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>tanaka\r\nsuzaki\r\nshimizu\r\nsasaki<\/code><\/pre>\n<p>\u4e2d\u9593\u64cd\u4f5c\u306b\u306f\u3001\u3053\u306e\u4ed6\u306b\u3082\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<table class=\"Base-table\">\n<colgroup>\n<col>\n<col>\n\t<\/colgroup>\n<thead>\n<tr>\n<th>\u30e1\u30bd\u30c3\u30c9\u540d<\/th>\n<th>\u6982\u8981<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>flatMap\n\t\t\t<\/td>\n<td>\u591a\u91cd\u69cb\u9020\u3067\u4fdd\u6301\u3055\u308c\u308b\u5404\u8981\u7d20\u3092\u30d5\u30e9\u30c3\u30c8\u306a\u69cb\u9020\u306b\u7e8f\u3081\uff08\u5909\u63db\uff09\u307e\u3059\u3002\n\t\t\t<\/td>\n<\/tr>\n<tr>\n<td>skip\n\t\t\t<\/td>\n<td>skip(n)\u3067\u3001n\u500b\u76ee\u306e\u307e\u3067\u306e\u8981\u7d20\u3092\u8aad\u307f\u98db\u3070\u3057\u3001\u305d\u308c\u4ee5\u964d\u306e\u8981\u7d20\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002\n\t\t\t<\/td>\n<\/tr>\n<tr>\n<td>limit\n\t\t\t<\/td>\n<td>limit(n)\u3067\u3001n\u500b\u76ee\u307e\u3067\u306e\u8981\u7d20\u3092\u53d6\u5f97\u3057\u3001\u305d\u308c\u4ee5\u964d\u3092\u9664\u53bb\u3057\u307e\u3059\u3002\n\t\t\t<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h5 class=\"Heading Title Title--xs\" id=\"Bookmark-4-2-4\"><span class=\"Num\">4.2.4.<\/span>\u305d\u306e\u4ed6\u306e\u7d42\u7aef\u64cd\u4f5c<\/h5>\n<p>\u7d42\u7aef\u64cd\u4f5c\u3082\u3001forEach\u30e1\u30bd\u30c3\u30c9\u306e\u4ed6\u306b\u3082\u69d8\u3005\u306a\u30e1\u30bd\u30c3\u30c9\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\u306e\u3067\u3001\u3044\u304f\u3064\u304b\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<h6 class=\"Heading Title Title--xxs\" id=\"Bookmark-4-2-4-1\"><span class=\"Num\">4.2.4.1.<\/span>collect<\/h6>\n<p>collect\u30e1\u30bd\u30c3\u30c9\u306fStream\u306e\u5185\u5bb9\u3067List\u3084Map\u306e\u751f\u6210\u3092\u884c\u3046\u3001\u7d42\u7aef\u64cd\u4f5c\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u306fStream\u306e\u51e6\u7406\u3067\u62bd\u51fa\u51e6\u7406\u3092\u884c\u3063\u305f\u5f8c\u3001\u62bd\u51fa\u7d50\u679c\u3092\u30ea\u30b9\u30c8\u3068\u3057\u3066\u8fd4\u5374\u3059\u308b\u30b5\u30f3\u30d7\u30eb\u30bd\u30fc\u30b9\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<div class=\"Pre-title\">StreamTest5.java<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>import java.util.Arrays;\r\nimport java.util.List;\r\nimport java.util.stream.Collectors;\r\n\r\npublic class StreamTest5 {\r\n\tpublic static void main(String[] args) {\r\n\r\n\t\t\/\/ String\u578b\u914d\u5217\u306e\u751f\u6210\u3068\u3001\u8981\u7d20\u306e\u4ee3\u5165\r\n\t\tfinal String[] data = { \"shimizu\", \"tanaka\", \"sasaki\", \"suzaki\" };\r\n\r\n\t\t\/\/ \u914d\u5217\u3092String\u578b\u306eList\u306b\u5909\u63db\r\n\t\tList&lt;String&gt; list = Arrays.asList(data);\r\n\r\n\t\t\/\/ Stream\u3092\u751f\u6210\u3057\u3001\u300cs\u300d\u304b\u3089\u59cb\u307e\u308b\u8981\u7d20\u3060\u3051\u3092\u62bd\u51fa\u3057\u3001\u30ea\u30b9\u30c8\u3092\u751f\u6210\r\n\t\tList&lt;String&gt; collectList = list.stream().filter(\r\n\t\t\tname -&gt; name.startsWith(\"s\")).collect(Collectors.toList());\r\n\r\n\t\tSystem.out.println(list);\r\n\t\tSystem.out.println(collectList);\r\n\t}\r\n}<\/code><\/pre>\n<div class=\"Pre-title\">\u5b9f\u884c\u7d50\u679c<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>[shimizu, tanaka, sasaki, suzaki]\r\n[shimizu, sasaki, suzaki]<\/code><\/pre>\n<p>\u30ea\u30b9\u30c8\u3092\u751f\u6210\u3059\u308b\u51e6\u7406\u306f\u3001collect\u30e1\u30bd\u30c3\u30c9\u3092\u8a18\u8ff0\u3057\u3066\u3044\u308b\u3001\u4ee5\u4e0b\u306e\u90e8\u5206\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>collect(Collectors.toList())<\/code><\/pre>\n<p>collect\u30e1\u30bd\u30c3\u30c9\u306b\u306f\u3001Collector\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u5b9f\u88c5\u30af\u30e9\u30b9\u3092\u6e21\u3059\u5fc5\u8981\u304c\u3042\u308a\u3001<br \/>\n\u4eca\u56de\u306e\u30b5\u30f3\u30d7\u30eb\u3067\u306f\u300ctoList()\u300d\u3092\u6e21\u3057\u3066List\u304c\u751f\u6210\u3055\u308c\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u306a\u304a\u3001List\u3067\u306f\u306a\u304fMap\u3092\u751f\u6210\u3059\u308b\u5834\u5408\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3001\u300ctoMap()\u300d\u3092collect\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u306b\u6e21\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>collect(Collectors.toMap(key -&gt; key, value -&gt; value))<\/code><\/pre>\n<h6 class=\"Heading Title Title--xxs\" id=\"Bookmark-4-2-4-2\"><span class=\"Num\">4.2.4.2.<\/span>anyMatch<\/h6>\n<p>anyMatch\u30e1\u30bd\u30c3\u30c9\u306fStream\u306e\u8981\u7d20\u306b\u5bfe\u3057\u3001\u6761\u4ef6\u306b\u4e00\u81f4\u3059\u308b\u8981\u7d20\u304c\u3042\u308b\u304b\u5224\u5b9a\u3057\u3001\u7d50\u679c\u3092\u53d6\u5f97\u3059\u308b\u7d42\u7aef\u64cd\u4f5c\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u306f\u3001Stream\u5185\u306b\u300ctanaka\u300d\u304c\u5b58\u5728\u3059\u308b\u304b\u5224\u5b9a\u3092\u884c\u3046\u30b5\u30f3\u30d7\u30eb\u30bd\u30fc\u30b9\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<div class=\"Pre-title\">StreamTest6.java<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>import java.util.Arrays;\r\nimport java.util.List;\r\n\r\npublic class StreamTest6 {\r\n\tpublic static void main(String[] args) {\r\n\r\n\t\t\/\/ String\u578b\u914d\u5217\u306e\u751f\u6210\u3068\u3001\u8981\u7d20\u306e\u4ee3\u5165\r\n\t\tfinal String[] data = { \"shimizu\", \"tanaka\", \"sasaki\", \"suzaki\" };\r\n\r\n\t\t\/\/ \u914d\u5217\u3092String\u578b\u306eList\u306b\u5909\u63db\r\n\t\tList&lt;String&gt; list = Arrays.asList(data);\r\n\r\n\t\t\/\/ Stream\u3092\u751f\u6210\u3057\u3001\u300ctanaka\u300d\u304c\u5b58\u5728\u3059\u308b\u304b\u5224\u5b9a\r\n\t\tif (list.stream().anyMatch(name -&gt; name.equals(\"tanaka\"))) {\r\n\t\t\tSystem.out.println(\"Stream\u5185\u306btanaka\u304c\u5b58\u5728\u3057\u307e\u3059\u3002\");\r\n\t\t} else {\r\n\t\t\tSystem.out.println(\"Stream\u5185\u306btanaka\u304c\u5b58\u5728\u3057\u307e\u305b\u3093\u3002\");\r\n\t\t}\r\n\t}\r\n}<\/code><\/pre>\n<div class=\"Pre-title\">\u5b9f\u884c\u7d50\u679c<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>Stream\u5185\u306btanaka\u304c\u5b58\u5728\u3057\u307e\u3059\u3002<\/code><\/pre>\n<p>anyMatch\u30e1\u30bd\u30c3\u30c9\u3067\u306f\u3001\u6761\u4ef6\u306b\u4e00\u90e8\u306e\u8981\u7d20\u304c\u4e00\u81f4\u3059\u308b\u5834\u5408\u306ftrue\u304c\u53d6\u5f97\u3057\u307e\u3059\u304c\u3001\u985e\u4f3c\u306e\u30e1\u30bd\u30c3\u30c9\u3068\u3057\u3066\u4ee5\u4e0b\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul class=\"Base-list\">\n<li class=\"Base-list__child\">allMatch\uff08\u5168\u3066\u306e\u8981\u7d20\u304c\u6761\u4ef6\u306b\u4e00\u81f4\u3059\u308b\u304b\u5224\u5b9a\uff09<\/li>\n<li class=\"Base-list__child\">noneMatch\uff08\u5168\u3066\u306e\u8981\u7d20\u304c\u6761\u4ef6\u306b\u4e00\u81f4\u3057\u306a\u3044\u304b\u5224\u5b9a\uff09<\/li>\n<\/ul>\n<p>\u7d42\u7aef\u64cd\u4f5c\u306b\u306f\u3001\u3053\u306e\u4ed6\u306b\u3082\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<table class=\"Base-table\">\n<colgroup>\n<col>\n<col>\n\t<\/colgroup>\n<thead>\n<tr>\n<th>\u30e1\u30bd\u30c3\u30c9\u540d<\/th>\n<th>\u6982\u8981<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>max\u3001min\n\t\t\t<\/td>\n<td>Stream\u5185\u306e\u6700\u5927\u5024\u8981\u7d20\u3084\u6700\u5c0f\u5024\u8981\u7d20\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002\n\t\t\t<\/td>\n<\/tr>\n<tr>\n<td>findFirst\n\t\t\t<\/td>\n<td>Stream\u5185\u306e\u6700\u521d\u306e\u8981\u7d20\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002\n\t\t\t<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<div class=\"Information-block\">\n<div class=\"Information-heading\">\n<div class=\"Google-icon Google-icon--information\"><\/div>\n<div class=\"Information-heading__child\">Information<\/div>\n<\/p><\/div>\n<div class=\"Heading Title Title--xs\">Optional<\/div>\n<p>\t\u4e00\u90e8\u306e\u7d42\u7aef\u64cd\u4f5c\u3067\u53d6\u5f97\u3067\u304d\u308b\u7d50\u679c\u306e\u578b\u306b\u306f\u3001Optional\u578b\u3068\u3044\u3046\u3082\u306e\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\t\u4ee5\u4e0b\u306fOptional\u578b\u3067\u63d0\u4f9b\u3055\u308c\u308b\u30e1\u30bd\u30c3\u30c9\u306e\u4e00\u90e8\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<table class=\"Base-table\">\n<colgroup>\n<col>\n<col>\n\t\t<\/colgroup>\n<thead>\n<tr>\n<th class=\"Nowrap\">\u30e1\u30bd\u30c3\u30c9\u540d<\/th>\n<th>\u6982\u8981<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td class=\"Nowrap\">get<\/td>\n<td>Optional\u578b\u3067\u4fdd\u6301\u3055\u308c\u3066\u3044\u308b\u5024\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002<\/td>\n<\/tr>\n<tr>\n<td class=\"Nowrap\">isPresent<\/td>\n<td>Optional\u578b\u3067\u4fdd\u6301\u3055\u308c\u3066\u3044\u308b\u5024\u304c\u5b58\u5728\u3059\u308b\u304b\u5224\u5b9a\u3057\u307e\u3059\u3002\u5b58\u5728\u3059\u308c\u3070true\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002\t<\/td>\n<\/tr>\n<tr>\n<td class=\"Nowrap\">ifPresent<\/td>\n<td>Optional\u578b\u3067\u4fdd\u6301\u3055\u308c\u3066\u3044\u308b\u5024\u304c\u5b58\u5728\u3059\u308b\u5834\u5408\u306b\u5b9f\u884c\u3057\u305f\u3044\u51e6\u7406\u3092\u5f15\u6570\u306b\u6307\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\t<\/td>\n<\/tr>\n<tr>\n<td class=\"Nowrap\">orElse<\/td>\n<td>Optional\u578b\u3067\u4fdd\u6301\u3055\u308c\u3066\u3044\u308b\u5024\u304c\u5b58\u5728\u3059\u308b\u5834\u5408\u306f\u5024\u306e\u53d6\u5f97\u3092\u884c\u3044\u3001\u5b58\u5728\u3057\u306a\u3044\u5834\u5408\u306f\u5f15\u6570\u306b\u6307\u5b9a\u3057\u305f\u5024\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002\t<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\tOptional\u578b\u306f\u5024\u304c\u5b58\u5728\u3059\u308b\u304b\u306e\u30c1\u30a7\u30c3\u30af\u3084\u5024\u304c\u5b58\u5728\u3057\u306a\u3044\u5834\u5408\u306b\u5225\u5024\u306b\u7f6e\u304d\u63db\u3048\u7b49\u304c\u884c\u3048\u307e\u3059\u3002<br \/>\n\t\u672c\u7ae0\u3067\u306f\u8a73\u3057\u3044\u8aac\u660e\u306f\u5272\u611b\u3057\u307e\u3059\u304c\u3001\u982d\u306e\u7247\u9685\u306b\u306f\u7f6e\u3044\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002\n<\/p><\/div>\n<p>Stream API\u3092\u4f7f\u3044\u3053\u306a\u305b\u308b\u3088\u3046\u306b\u306a\u308b\u3068\u3001\u975e\u5e38\u306b\u8907\u96d1\u306a\u51e6\u7406\u3092\u7c21\u6f54\u306b\u8a18\u8ff0\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<br \/>\n\u3084\u3084\u96e3\u6613\u5ea6\u304c\u9ad8\u304f\u611f\u3058\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u304c\u3001\u958b\u767a\u73fe\u5834\u3067\u4f7f\u3046\u5834\u9762\u3082\u5897\u3048\u3066\u304d\u3066\u3044\u307e\u3059\u306e\u3067\u3001\u57fa\u672c\u306f\u62bc\u3055\u3048\u3066\u304a\u304f\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u30e9\u30e0\u30c0\u5f0f\u3068Stream API\u306b\u95a2\u3059\u308b\u8aac\u660e\u306f\u4ee5\u4e0a\u3067\u3059\u3002<\/p>\n<div class=\"Separator\">\n<div class=\"Separator__child\"><\/div>\n<\/div>\n<h3 class=\"Heading Title Title--m\" id=\"Bookmark-5\"><span class=\"Num\">5.<\/span>\u7df4\u7fd2\u554f\u984c1<\/h3>\n<p>Enum\u306e\u7df4\u7fd2\u554f\u984c\u3067\u3059\u3002<\/p>\n<h4 class=\"Heading Title Title--s\" id=\"Bookmark-5-1\"><span class=\"Num\">5.1.<\/span>\u554f\u984c1<\/h4>\n<p>\u4ee5\u4e0b\u306e\u30e1\u30c3\u30bb\u30fc\u30b8\u30b3\u30fc\u30c9\u3068\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u6301\u3064Enum\u3092\u5b9a\u7fa9\u3057\u3001\u30e1\u30c3\u30bb\u30fc\u30b8\u30b3\u30fc\u30c9\u304b\u3089\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u53d6\u5f97\u3067\u304d\u308b\u30e1\u30bd\u30c3\u30c9\u3092\u4f5c\u6210\u3057\u3066\u304f\u3060\u3055\u3044\u3002<br \/>\n\u307e\u305f\u3001\u4f5c\u6210\u3057\u305fEnum\u3092\u547c\u3073\u51fa\u3057\u3066\u5b9f\u884c\u3059\u308b\u3001main\u30e1\u30bd\u30c3\u30c9\u3092\u6301\u3064\u30af\u30e9\u30b9\u3082\u3042\u308f\u305b\u3066\u5b9f\u88c5\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<table class=\"Base-table\">\n<caption class=\"title\">\u8868 1. Enum\u306e\u5b9a\u7fa9<\/caption>\n<colgroup>\n<col>\n<col>\n\t<\/colgroup>\n<thead>\n<tr>\n<th>\u30e1\u30c3\u30bb\u30fc\u30b8\u30b3\u30fc\u30c9<\/th>\n<th>\u30e1\u30c3\u30bb\u30fc\u30b8<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>001\n\t\t\t<\/td>\n<td>INFO\u30e1\u30c3\u30bb\u30fc\u30b8\n\t\t\t<\/td>\n<\/tr>\n<tr>\n<td>002\n\t\t\t<\/td>\n<td>WARN\u30e1\u30c3\u30bb\u30fc\u30b8\n\t\t\t<\/td>\n<\/tr>\n<tr>\n<td>003\n\t\t\t<\/td>\n<td>ERROR\u30e1\u30c3\u30bb\u30fc\u30b8\n\t\t\t<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<div class=\"Pre-title\">MessageEnumMain.java<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>public class MessageEnumMain {\r\n\r\n\tpublic static void main(String[] args) {\r\n\r\n\t\t\/*  \u3053\u3053\u306b\u8ffd\u8a18\uff08\u4f5c\u6210\u3057\u305fEnum\u3092\u547c\u3073\u51fa\u3057\u3001INFO\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u30b3\u30f3\u30bd\u30fc\u30eb\u3078\u51fa\u529b\uff09 *\/\r\n\r\n\t\t\/*  \u3053\u3053\u306b\u8ffd\u8a18\uff08\u4f5c\u6210\u3057\u305fEnum\u3092\u547c\u3073\u51fa\u3057\u3001ERROR\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u30b3\u30f3\u30bd\u30fc\u30eb\u3078\u51fa\u529b\uff09 *\/\r\n\r\n\t}\r\n}<\/code><\/pre>\n<div class=\"Answer-block\">\n\t<input class=\"SW\" type=\"checkbox\" id=\"Answer-content-1\"><label for=\"Answer-content-1\" class=\"Answer-SW\"><span\n\t\t\tclass=\"Google-icon Google-icon--arrow-single-gray\"><\/span>\u89e3\u7b54\u3092\u8868\u793a\u3059\u308b<\/label><\/p>\n<div class=\"Answer-content\">\n<div class=\"Pre-title\">MessageEnum.java<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>public enum MessageEnum {\r\n\tINFO(\"001\", \"INFO\u30e1\u30c3\u30bb\u30fc\u30b8\"),\r\n\tWARN(\"002\", \"WARN\u30e1\u30c3\u30bb\u30fc\u30b8\"),\r\n\tERROR(\"003\", \"ERROR\u30e1\u30c3\u30bb\u30fc\u30b8\");\r\n\r\n\t\/\/ \u30e1\u30c3\u30bb\u30fc\u30b8\u30b3\u30fc\u30c9\r\n\tprivate String messageCode;\r\n\t\/\/ \u30e1\u30c3\u30bb\u30fc\u30b8\r\n\tprivate String message;\r\n\r\n\tprivate MessageEnum(String messageCode, String message) {\r\n\t\tthis.messageCode = messageCode;\r\n\t\tthis.message = message;\r\n\t}\r\n\r\n\tpublic String getMessageCode() {\r\n\t\treturn messageCode;\r\n\t}\r\n\r\n\tpublic String getMessage() {\r\n\t\treturn message;\r\n\t}\r\n\r\n\t\/**\r\n\t * \u5f15\u6570\u306e\u30e1\u30c3\u30bb\u30fc\u30b8\u30b3\u30fc\u30c9\u304b\u3089\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u53d6\u5f97\u3059\u308b\r\n\t *\r\n\t * @param messageCode \u30e1\u30c3\u30bb\u30fc\u30b8\u30b3\u30fc\u30c9\r\n\t * @return \u30e1\u30c3\u30bb\u30fc\u30b8\u30b3\u30fc\u30c9\u306b\u4e00\u81f4\u3059\u308b\u30e1\u30c3\u30bb\u30fc\u30b8 \/ \u4e00\u81f4\u3057\u306a\u3044\u5834\u5408\u306fnull\r\n\t *\/\r\n\tpublic static String getMessageByCode(String messageCode) {\r\n\t\tMessageEnum[] array = values();\r\n\r\n\t\tfor(MessageEnum msgEnum : array) {\r\n\t\t\tif (msgEnum.messageCode.equals(messageCode)) {\r\n\t\t\t\treturn msgEnum.message;\r\n\t\t\t}\r\n\t\t}\r\n\t\treturn null;\r\n\t}\r\n}<\/code><\/pre>\n<div class=\"Pre-title\">MessageEnumMain.java<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>public class MessageEnumMain {\r\n\r\n\tpublic static void main(String[] args) {\r\n\r\n\t\t\/\/ INFO\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u30b3\u30f3\u30bd\u30fc\u30eb\u3078\u51fa\u529b\u3059\u308b\r\n\t\tSystem.out.println(MessageEnum.getMessageByCode(\"001\"));\r\n\r\n\t\t\/\/ ERROR\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u30b3\u30f3\u30bd\u30fc\u30eb\u3078\u51fa\u529b\u3059\u308b\r\n\t\tSystem.out.println(MessageEnum.getMessageByCode(\"003\"));\r\n\t}\r\n}<\/code><\/pre>\n<div class=\"Pre-title\">\u5b9f\u884c\u7d50\u679c<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>INFO\u30e1\u30c3\u30bb\u30fc\u30b8\r\nERROR\u30e1\u30c3\u30bb\u30fc\u30b8<\/code><\/pre>\n<p>\t\tMessageEnum.java\u3067\u306f\u3001Enum\u306b\u8907\u6570\u306e\u5b9a\u6570\u5024\u3092\u307e\u3068\u3081\u3066\u5b9a\u7fa9\u3057\u3066\u3044\u307e\u3059\u3002<br \/>\n\t\t\u305d\u3057\u3066\u3001\u72ec\u81ea\u306b\u8ffd\u52a0\u3057\u305fgetMessageByCode\u30e1\u30bd\u30c3\u30c9\u5185\u3067\u3001\u6697\u9ed9\u7684\u306b\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308bvalues\u30e1\u30bd\u30c3\u30c9\u3092\u5229\u7528\u3057\u3066\u5168\u3066\u306eEnum\u3092\u691c\u7d22\u3059\u308b\u51e6\u7406\u3092\u3057\u3066\u3044\u307e\u3059\u3002<br \/>\n\t\tgetMessageByCode\u30e1\u30bd\u30c3\u30c9\u306f\u3001MessageEnum.java\u5185\u306e\u5168\u3066\u306eEnum\u3092\u53c2\u7167\u3059\u308b\u305f\u3081\u3001\u30af\u30e9\u30b9\u30e1\u30bd\u30c3\u30c9\u3068\u3057\u3066\u5b9a\u7fa9\u3092\u3057\u3066\u304f\u3060\u3055\u3044\u3002\n\t<\/p><\/div>\n<\/div>\n<h4 class=\"Heading Title Title--s\" id=\"Bookmark-5-2\"><span class=\"Num\">5.2.<\/span>\u554f\u984c2<\/h4>\n<p>\u554f\u984c1\u3067\u4f5c\u6210\u3057\u305fEnum\u306e\u5b9a\u7fa9\u3092\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u4fee\u6b63\u3057\u3001\u30e9\u30d9\u30eb\u304b\u3089\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u53d6\u5f97\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u3092\u4f5c\u6210\u3057\u3066\u304f\u3060\u3055\u3044\u3002<br \/>\n\u307e\u305f\u3001main\u30e1\u30bd\u30c3\u30c9\u3092\u6301\u3064\u30af\u30e9\u30b9\u306b\u3001\u30e9\u30d9\u30eb\u304b\u3089\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u53d6\u5f97\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059\u51e6\u7406\u3082\u8ffd\u52a0\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<table class=\"Base-table\">\n<caption class=\"title\">\u8868 2. Enum\u306e\u5b9a\u7fa9<\/caption>\n<colgroup>\n<col>\n<col>\n<col>\n\t<\/colgroup>\n<thead>\n<tr>\n<th>\u30e1\u30c3\u30bb\u30fc\u30b8\u30b3\u30fc\u30c9<\/th>\n<th>\u30e9\u30d9\u30eb<\/th>\n<th>\u30e1\u30c3\u30bb\u30fc\u30b8<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>001\n\t\t\t<\/td>\n<td>\u3010\u901a\u77e5\u3011\n\t\t\t<\/td>\n<td>INFO\u30e1\u30c3\u30bb\u30fc\u30b8\n\t\t\t<\/td>\n<\/tr>\n<tr>\n<td>002\n\t\t\t<\/td>\n<td>\u3010\u8b66\u544a\u3011\n\t\t\t<\/td>\n<td>WARN\u30e1\u30c3\u30bb\u30fc\u30b8\n\t\t\t<\/td>\n<\/tr>\n<tr>\n<td>003\n\t\t\t<\/td>\n<td>\u3010\u7570\u5e38\u3011\n\t\t\t<\/td>\n<td>ERROR\u30e1\u30c3\u30bb\u30fc\u30b8\n\t\t\t<\/td>\n<\/tr>\n<tr>\n<td>004\n\t\t\t<\/td>\n<td>\u3010\u8a73\u7d30\u3011\n\t\t\t<\/td>\n<td>DETAIL\u30e1\u30c3\u30bb\u30fc\u30b8\n\t\t\t<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<div class=\"Pre-title\">MessageEnumMain.java<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>public class MessageEnumMain {\r\n\r\n\tpublic static void main(String[] args) {\r\n\r\n\t\t\/*  \u554f\u984c1\u3067\u5b9f\u88c5\u3057\u305f\u51e6\u7406\u306e\u4e0b\u306b\u4ee5\u4e0b\u3092\u8ffd\u8a18 *\/\r\n\r\n\t\t\/*  \u30e9\u30d9\u30eb\u3010\u8b66\u544a\u3011\u304b\u3089\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u547c\u3073\u51fa\u3057\u3066\u3001\u30b3\u30f3\u30bd\u30fc\u30eb\u3078\u51fa\u529b\u3059\u308b\u51e6\u7406 *\/\r\n\t\t\/*  \u30e9\u30d9\u30eb\u3010\u8a73\u7d30\u3011\u304b\u3089\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u547c\u3073\u51fa\u3057\u3066\u3001\u30b3\u30f3\u30bd\u30fc\u30eb\u3078\u51fa\u529b\u3059\u308b\u51e6\u7406 *\/\r\n\r\n\t}\r\n}<\/code><\/pre>\n<p><span class=\"Text-highlight\">\u203b\u3053\u306e\u554f\u984c\u306e\u89e3\u7b54\u306f\u63b2\u8f09\u3057\u3066\u304a\u308a\u307e\u305b\u3093\u3002<span class=\"Post-link\" >Tech Fun IT\u30b9\u30af\u30fc\u30eb\u306eJava\u7814\u4fee<\/span>\u3067\u306f\u3001\u8b1b\u5e2b\u304c\u4e01\u5be7\u306b\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002<\/span><br \/>\n<span class=\"Text-red-bold\">\u73fe\u5728Tech Fun IT\u30b9\u30af\u30fc\u30eb\u3067\u306f\u3001\u65b0\u898f\u53d7\u8b1b\u8005\u306e\u52df\u96c6\u306f\u884c\u306a\u3063\u3066\u304a\u308a\u307e\u305b\u3093\u3002<\/span><\/p>\n<div class=\"Separator\">\n<div class=\"Separator__child\"><\/div>\n<\/div>\n<h3 class=\"Heading Title Title--m\" id=\"Bookmark-6\"><span class=\"Num\">6.<\/span>\u7df4\u7fd2\u554f\u984c2<\/h3>\n<p>\u30e9\u30e0\u30c0\u5f0f\u3068Stream API\u306e\u7df4\u7fd2\u554f\u984c\u3067\u3059\u3002<\/p>\n<h4 class=\"Heading Title Title--s\" id=\"Bookmark-6-1\"><span class=\"Num\">6.1.<\/span>\u554f\u984c1<\/h4>\n<p>\u4ee5\u4e0b\u306f\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3068Stream API\u3092\u7528\u3044\u305f\u62bd\u51fa\u51e6\u7406\u3092\u5b9f\u88c5\u3092\u3057\u3066\u3044\u307e\u3059\u3002<br \/>\n\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u5b9f\u88c5\u3092\u7528\u3044\u3066\u3001\u62bd\u51fa\u51e6\u7406\u3092\u5b8c\u6210\u3055\u305b\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<div class=\"Pre-title\">FilterFunction.java<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>import java.util.List;\r\n\r\n@FunctionalInterface\r\npublic interface FilterFunction {\r\n\r\n\tpublic List&lt;String&gt; filterFunc(List&lt;String&gt; list);\r\n\r\n}<\/code><\/pre>\n<div class=\"Pre-title\">FilterFunctionTest.java<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>import java.util.Arrays;\r\nimport java.util.List;\r\nimport java.util.stream.Collectors;\r\n\r\npublic class FilterFunctionTest {\r\n\r\n\tpublic static void main(String[] args) {\r\n\r\n\t\tList&lt;String&gt; nameList = Arrays.asList(\"sato\", \"ito\", \"tanaka\", \"sasaki\", \"suzuki\");\r\n\r\n\t\t\/\/ FilterFunction\u30af\u30e9\u30b9\u3092\u5b9f\u88c5\u3057\u3066\u300cs\u300d\u304b\u3089\u59cb\u307e\u308b\u8981\u7d20\u3060\u3051\u3092\u62bd\u51fa\u3059\u308b\r\n\t\tFilterFunction function = (list) -&gt; {\r\n\t\t\treturn list.stream().filter(name -&gt;\r\n\t\t\t\tname.startsWith(\"s\")).collect(Collectors.toList());\r\n\t\t};\r\n\r\n\t\t\/*  \u3053\u3053\u306b\u8ffd\u8a18\uff08\u4e0a\u8a18\u3067\u62bd\u51fa\u3057\u305f\u7d50\u679c\u3092\u30b3\u30f3\u30bd\u30fc\u30eb\u3078\u51fa\u529b\u3059\u308b\uff09 *\/\r\n\t}\r\n}<\/code><\/pre>\n<div class=\"Pre-title\">\u5b9f\u884c\u7d50\u679c<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>sato\r\nsasaki\r\nsuzuki<\/code><\/pre>\n<div class=\"Answer-block\">\n\t<input class=\"SW\" type=\"checkbox\" id=\"Answer-content-2\"><label for=\"Answer-content-2\" class=\"Answer-SW\"><span\n\t\t\tclass=\"Google-icon Google-icon--arrow-single-gray\"><\/span>\u89e3\u7b54\u3092\u8868\u793a\u3059\u308b<\/label><\/p>\n<div class=\"Answer-content\">\n<div class=\"Pre-title\">FilterFunctionTest.java<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>import java.util.Arrays;\r\nimport java.util.List;\r\nimport java.util.stream.Collectors;\r\n\r\npublic class FilterFunctionTest {\r\n\r\n\tpublic static void main(String[] args) {\r\n\r\n\t\tList&lt;String&gt; nameList = Arrays.asList(\"sato\", \"ito\", \"tanaka\", \"sasaki\", \"suzuki\");\r\n\r\n\t\t\/\/ FilterFunction\u30af\u30e9\u30b9\u3092\u5b9f\u88c5\u3057\u3066\u300cs\u300d\u304b\u3089\u59cb\u307e\u308b\u8981\u7d20\u3060\u3051\u3092\u62bd\u51fa\u3059\u308b\r\n\t\tFilterFunction function = (list) -&gt; {\r\n\t\t\treturn list.stream().filter(name -&gt;\r\n\t\t\t\tname.startsWith(\"s\")).collect(Collectors.toList());\r\n\t\t};\r\n\r\n\t\t\/\/ \u62bd\u51fa\u3057\u305f\u7d50\u679c\u3092\u30b3\u30f3\u30bd\u30fc\u30eb\u3078\u51fa\u529b\u3059\u308b\r\n\t\tfunction.filterFunc(nameList).stream().forEach(System.out::println);\r\n\r\n\t}\r\n}<\/code><\/pre>\n<p>\t\tFilterFunction\u306fList\u3092\u5f15\u6570\u3067\u53d7\u3051\u53d6\u308a\u3001List\u3092\u8fd4\u5374\u3059\u308b\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u304c\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u3059\u3002<br \/>\n\t\t\u30e9\u30e0\u30c0\u5f0f\u306e\u5b9f\u88c5\u306f\u524d\u9805\u306e\u300c<a href=\"#Bookmark-3-1-2-2\">\u30e9\u30e0\u30c0\u5f0f\u3092\u5229\u7528\u3057\u305f\u5b9f\u88c5<\/a>\u300d\u306eLambdaTest3.java\u3068\u540c\u3058\u5f62\u5f0f\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>FilterFunction function = (list) -&gt; {\r\n\r\n};<\/code><\/pre>\n<p>\t\t\u62bd\u51fa\u51e6\u7406\u306b\u306f\u3001filter\u30e1\u30bd\u30c3\u30c9\u3092\u5229\u7528\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>list.stream().filter(name -&gt; name.startsWith(\"s\"))<\/code><\/pre>\n<p>\t\t\u307e\u305f\u3001\u62bd\u51fa\u7d50\u679c\u3092\u30ea\u30b9\u30c8\u3068\u3057\u3066\u8fd4\u5374\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u305f\u3081\u3001\u7d42\u7aef\u64cd\u4f5c\u306bcollect\u30e1\u30bd\u30c3\u30c9\u3092\u5229\u7528\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>list.stream().filter(name -&gt; name.startsWith(\"s\")).collect(Collectors.toList());<\/code><\/pre>\n<p>\t\t\u3053\u308c\u3089\u306eStream API\u306e\u51e6\u7406\u3068\u30e9\u30e0\u30c0\u5f0f\u3092\u5408\u308f\u305b\u308b\u3068\u4e0b\u8a18\u306e\u3088\u3046\u306a\u51e6\u7406\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>\/\/ FilterFunction\u30af\u30e9\u30b9\u3092\u5b9f\u88c5\u3057\u3066\u300cs\u300d\u304b\u3089\u59cb\u307e\u308b\u8981\u7d20\u3060\u3051\u3092\u62bd\u51fa\u3059\u308b\r\nFilterFunction function = (list) -&gt; {\r\n\treturn list.stream().filter(name -&gt; name.startsWith(\"s\")).collect(Collectors.toList());\r\n};<\/code><\/pre>\n<p>\t\t\u5b9f\u88c5\u3055\u308c\u305fFilterFunction\u306efilterFunc\u30e1\u30bd\u30c3\u30c9\u306f\u30ea\u30b9\u30c8\u3092\u8fd4\u5374\u3059\u308b\u305f\u3081\u3001<br \/>\n\t\t\u305d\u308c\u3089\u3092\u30b3\u30f3\u30bd\u30fc\u30eb\u3078\u51fa\u529b\u3059\u308b\u5834\u5408\u306fFilterFunction\u306efilterFunc\u30e1\u30bd\u30c3\u30c9\u306e\u7d50\u679c\u304b\u3089Stream\u3092\u751f\u6210\u3057\u3001<br \/>\n\t\t\u3053\u308c\u307e\u3067\u3068\u540c\u69d8\u306bforEach\u30e1\u30bd\u30c3\u30c9\u306b\u3066\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u3092\u884c\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>function.filterFunc(nameList).stream().forEach(System.out::println);<\/code><\/pre>\n<\/p><\/div>\n<\/div>\n<h4 class=\"Heading Title Title--s\" id=\"Bookmark-6-2\"><span class=\"Num\">6.2.<\/span>\u554f\u984c2<\/h4>\n<p>\u4ee5\u4e0b\u306fStream API\u3092\u7528\u3044\u305f\u62bd\u51fa\u51e6\u7406\u3092\u5b9f\u88c5\u3092\u3057\u3066\u3044\u307e\u3059\u3002<br \/>\n\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u5b9f\u88c5\u3092\u7528\u3044\u3066\u3001\u62bd\u51fa\u51e6\u7406\u3092\u5b8c\u6210\u3055\u305b\u3066\u304f\u3060\u3055\u3044\u3002<br \/>\n\u305f\u3060\u3057\u3001FilterFunction\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306f\u554f\u984c1\u3067\u4f7f\u7528\u3057\u305f\u3082\u306e\u3092\u518d\u5229\u7528\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<div class=\"Pre-title\">FilterFunctionTest2.java<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>import java.util.Arrays;\r\nimport java.util.List;\r\nimport java.util.stream.Collectors;\r\n\r\npublic class FilterFunctionTest2 {\r\n\r\n\tpublic static void main(String[] args) {\r\n\r\n\t\tList&lt;String&gt; nameList = Arrays.asList(\"sato\", \"ito\", \"tanaka\", \"sasaki\", \"suzuki\", \"kikuchi\", \"matsumoto\", \"yamada\", \"sakurai\", \"ueda\", \"kimura\");\r\n\r\n\t\t\/* \u3053\u3053\u306b\u8ffd\u8a18\uff08nameList\u306e\u8981\u7d20\u306e\u3046\u3061\u30014\u500b\u76ee\u307e\u3067\u306e\u8981\u7d20\u3092\u8aad\u307f\u98db\u3070\u3057\u3001\u305d\u3053\u304b\u3089\uff13\u500b\u76ee\u307e\u3067\u306e\u8981\u7d20\u3092\u53d6\u5f97\u3059\u308b\u3002\uff09 *\/\r\n\r\n\t\t\/* \u3053\u3053\u306b\u8ffd\u8a18\uff08\u4e0a\u8a18\u3067\u62bd\u51fa\u3057\u305f\u7d50\u679c\u3092\u30b3\u30f3\u30bd\u30fc\u30eb\u3078\u51fa\u529b\u3059\u308b\uff09 *\/\r\n\r\n\t}\r\n}<\/code><\/pre>\n<div class=\"Pre-title\">\u5b9f\u884c\u7d50\u679c<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>suzuki\r\nkikuchi\r\nmatsumoto<\/code><\/pre>\n<p><span class=\"Text-highlight\">\u203b\u3053\u306e\u554f\u984c\u306e\u89e3\u7b54\u306f\u63b2\u8f09\u3057\u3066\u304a\u308a\u307e\u305b\u3093\u3002<span class=\"Post-link\" >Tech Fun IT\u30b9\u30af\u30fc\u30eb\u306eJava\u7814\u4fee<\/span>\u3067\u306f\u3001\u8b1b\u5e2b\u304c\u4e01\u5be7\u306b\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002<\/span><br \/>\n<span class=\"Text-red-bold\">\u73fe\u5728Tech Fun IT\u30b9\u30af\u30fc\u30eb\u3067\u306f\u3001\u65b0\u898f\u53d7\u8b1b\u8005\u306e\u52df\u96c6\u306f\u884c\u306a\u3063\u3066\u304a\u308a\u307e\u305b\u3093\u3002<\/span>\t\t<\/p>\n<div class=\"Separator\">\n<div class=\"Separator__child\"><\/div>\n<\/div>\n<h3 class=\"Heading Title Title--m\" id=\"Bookmark-7\"><span class=\"Num\">7.<\/span>\u672c\u7ae0\u306e\u307e\u3068\u3081<\/h3>\n<ul class=\"Base-list\">\n<li class=\"Base-list__child\">\u300cEnum\u300d\u306f\u3001\u8907\u6570\u306e\u5b9a\u6570\u30921\u3064\u306e\u30af\u30e9\u30b9\u3078\u307e\u3068\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u65b0\u305f\u306a\u578b\u3067\u3001\u300c\u5217\u6319\u578b\u300d\u3068\u3082\u3044\u3046\u3002 <\/li>\n<li class=\"Base-list__child\">Enum\u306b\u306f\u6697\u9ed9\u7684\u306b\u5ba3\u8a00\u3055\u308c\u308b\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308b\u304c\u3001\u958b\u767a\u8005\u304c\u72ec\u81ea\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u8ffd\u52a0\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u308b\u3002 <\/li>\n<li class=\"Base-list__child\">\u300c\u30e9\u30e0\u30c0\u5f0f\u300d\u3068\u306f\u300c\u30a2\u30ed\u30fc\u6f14\u7b97\u5b50\uff08- &gt;\uff09\u300d\u3092\u4f7f\u3063\u305f\u66f8\u304d\u65b9\u3067\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u3088\u308a\u7c21\u6f54\u306b\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u308b\u3002 <\/li>\n<li class=\"Base-list__child\">\u300cStream API\u300d\u3068\u306f\u3001\u914d\u5217\u3084\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306a\u3069\u306e\u96c6\u8a08\u3001\u691c\u7d22\u3001\u30c7\u30fc\u30bf\u62bd\u51fa\u306a\u3069\u3092\u884c\u3046API\u3067\u3042\u308b\u3002 <\/li>\n<li class=\"Base-list__child\">Stream API\u306f\u300c\u4e2d\u9593\u64cd\u4f5c\u300d\u3068\u300c\u7d42\u7aef\u64cd\u4f5c\u300d\u3092\u4f7f\u3063\u3066\u51e6\u7406\u3092\u884c\u3046\u3002<\/li>\n<li class=\"Base-list__child\">\u4e2d\u9593\u64cd\u4f5c\u306b\u306f\u300csorted\u300d\u3084\u300cfilter\u300d\u306a\u3069\u304c\u3042\u308b\u3002<\/li>\n<li class=\"Base-list__child\">\u7d42\u7aef\u64cd\u4f5c\u306b\u306f\u300cforEach\u300d\u3084\u300ccollect\u300d\u306a\u3069\u304c\u3042\u308b\u3002<\/li>\n<\/ul>\n<p>\u672c\u7ae0\u3067\u5b66\u3093\u3060\u5185\u5bb9\u306f\u3001\u3069\u308c\u3082\u6163\u308c\u308b\u307e\u3067\u306f\u96e3\u3057\u304f\u611f\u3058\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<br \/>\n\u7406\u89e3\u3092\u6df1\u3081\u308b\u305f\u3081\u306b\u3001\u6559\u6750\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u5c11\u3057\u5909\u66f4\u3057\u3066\u3001\u3044\u308d\u3044\u308d\u306a\u30d1\u30bf\u30fc\u30f3\u3092\u8a66\u3057\u3066\u307f\u308b\u3068\u826f\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n<p>Enum\u30fb\u30e9\u30e0\u30c0\u5f0f\u30fbStream API\u306b\u3064\u3044\u3066\u306e\u8aac\u660e\u306f\u3001\u4ee5\u4e0a\u3067\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>1.\u672c\u7ae0\u3067\u306e\u5b66\u7fd2\u9805\u76ee \u672c\u7ae0\u3067\u306f\u3001Enum\u53ca\u3073Java 8\u3088\u308a\u5c0e\u5165\u3055\u308c\u305f\u30e9\u30e0\u30c0\uff08Lambda\uff09\u5f0f\u3068Stream API\u306b\u95a2\u3057\u3066\u5b66\u7fd2\u3057\u307e\u3059\u3002 2.Enum Enum\u306f\u3001\u8907\u6570\u306e\u5b9a\u6570\u30921\u3064\u306e\u30af\u30e9\u30b9\u3078\u307e\u3068\u3081\u308b\u3053\u3068\u304c\u884c\u3048\u308b\u65b0\u305f\u306a\u578b\u3067\u2026<\/p>\n","protected":false},"author":5,"featured_media":6010,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[2],"class_list":["post-199","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java-base"],"acf":{"chapter":15,"javabase_order":18,"list-display_description":"Enum\u53ca\u3073Java 8\u3088\u308a\u5c0e\u5165\u3055\u308c\u305f\u30e9\u30e0\u30c0\uff08Lambda\uff09\u5f0f\u3068Stream API\u306b\u95a2\u3057\u3066\u5b66\u7fd2\u3057\u307e\u3059\u3002"},"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/techfun.cc\/wp-json\/wp\/v2\/posts\/199","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/techfun.cc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/techfun.cc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/techfun.cc\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/techfun.cc\/wp-json\/wp\/v2\/comments?post=199"}],"version-history":[{"count":32,"href":"https:\/\/techfun.cc\/wp-json\/wp\/v2\/posts\/199\/revisions"}],"predecessor-version":[{"id":6503,"href":"https:\/\/techfun.cc\/wp-json\/wp\/v2\/posts\/199\/revisions\/6503"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/techfun.cc\/wp-json\/wp\/v2\/media\/6010"}],"wp:attachment":[{"href":"https:\/\/techfun.cc\/wp-json\/wp\/v2\/media?parent=199"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/techfun.cc\/wp-json\/wp\/v2\/categories?post=199"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}