{"id":168,"date":"2024-08-19T10:39:08","date_gmt":"2024-08-19T01:39:08","guid":{"rendered":"https:\/\/techfun.cc\/?p=168"},"modified":"2025-06-02T12:44:37","modified_gmt":"2025-06-02T03:44:37","slug":"java_base_frequently_class","status":"publish","type":"post","link":"https:\/\/techfun.cc\/java-base\/java_base_frequently_class.html","title":{"rendered":"\u3088\u304f\u4f7f\u3046\u30af\u30e9\u30b9"},"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\u3001Java\u306b\u3042\u308b\u6a19\u6e96\u306e\u30af\u30e9\u30b9\u306e\u8abf\u3079\u65b9\u3068\u3088\u304f\u4f7f\u3046\u30af\u30e9\u30b9\u3092\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>\u672c\u7ae0\u306e\u8b1b\u7fa9<\/h3>\n<p>\u672c\u7ae0\u3067\u5b66\u7fd2\u3059\u308b\u5185\u5bb9\u3092\u52d5\u753b\u3068\u3057\u3066\u307e\u3068\u3081\u305f\u3082\u306e\u3067\u3059\u3002\u6700\u521d\u306b\u4e00\u901a\u308a\u898b\u7d42\u308f\u3063\u305f\u5f8c\u3067\u3001\u5b66\u7fd2\u306b\u5165\u308b\u3088\u3046\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<div class=\"Video-block\">\n<div class=\"Video-block__title\">\u8b1b\u7fa9:\u3088\u304f\u4f7f\u3046\u30af\u30e9\u30b9<\/div>\n<div class=\"Video-block__video Youtube\">\n\t\t<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube-nocookie.com\/embed\/06UFwViGucs?si=mj-Sdo4-qjiS9Hol&#038;rel=0\"\n\t\t\ttitle=\"YouTube video player\" frameborder=\"0\"\n\t\t\tallow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\"\n\t\t\treferrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n\t<\/div>\n<\/div>\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>\u30af\u30e9\u30b9\u30e9\u30a4\u30d6\u30e9\u30ea<\/h3>\n<p>Java\u306b\u306f\u3001\u4e88\u3081\u591a\u304f\u306e\u30af\u30e9\u30b9\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\u3002<br \/>\n\u4f8b\u3048\u3070\u3001\u30d5\u30a1\u30a4\u30eb\u304b\u3089\u30c7\u30fc\u30bf\u3092\u8aad\u307f\u8fbc\u3093\u3060\u308a\u3001\u66f8\u304d\u8fbc\u3093\u3060\u308a\u3068\u3044\u3046\u51e6\u7406\u306f\u3001\u8aad\u307f\u8fbc\u3080\u30c7\u30fc\u30bf\u30d5\u30a1\u30a4\u30eb\u304c\u9055\u3063\u3066\u3082\u57fa\u672c\u306e\u51e6\u7406\u306f\u540c\u3058\u306b\u306a\u308a\u307e\u3059\u306e\u3067\u3001\u305d\u306e\u51e6\u7406\u3092\u6bce\u56de\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3059\u308b\u3053\u3068\u306f\u3001\u975e\u52b9\u7387\u3067\u3059\u3002<br \/>\n\u305d\u306e\u3088\u3046\u306a\u3001\u5171\u901a\u7684\u306b\u5229\u7528\u3067\u304d\u308b\u51e6\u7406\u306b\u3064\u3044\u3066\u306f\u3001Java\u3067\u65e2\u306b\u591a\u304f\u30af\u30e9\u30b9\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u30af\u30e9\u30b9\u3092<span class=\"Text-highlight\">\u30af\u30e9\u30b9\u30e9\u30a4\u30d6\u30e9\u30ea<\/span>\u3068\u547c\u3093\u3067\u3044\u307e\u3059\u3002<\/p>\n<p>\u901a\u5e38\u3001Java\u3067\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3059\u308b\u3068\u304d\u306b\u306f\u3001\u3053\u308c\u3089\u306e\u30af\u30e9\u30b9\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u3046\u307e\u304f\u5229\u7528\u3057\u3066\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3057\u3066\u3044\u304d\u3001\u52b9\u7387\u5316\u3092\u56f3\u308a\u307e\u3059\u3002<br \/>\n\u65e2\u306b\u3042\u308b\u30af\u30e9\u30b9\u306e\u6a5f\u80fd\u3092\u5229\u7528\u305b\u305a\u3001\u81ea\u5206\u3067\u4e00\u304b\u3089\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u8a18\u8ff0\u3057\u306a\u3044\u3088\u3046\u306b\u3001\u3053\u308c\u3089\u306e\u30af\u30e9\u30b9\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u8abf\u3079\u65b9\u3084\u4f7f\u3044\u65b9\u3092\u7fd2\u5f97\u3057\u3066\u304a\u304f\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<br \/>\n\u3053\u306e\u7ae0\u3067\u306f\u3001Java\u306e\u30af\u30e9\u30b9\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u4e2d\u3067\u3082\u3001\u3088\u304f\u4f7f\u3046\u30af\u30e9\u30b9\u3092\u5b66\u7fd2\u3057\u306a\u304c\u3089\u3001\u30af\u30e9\u30b9\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u8abf\u3079\u65b9\u3068\u4f7f\u3044\u65b9\u3092\u5b66\u7fd2\u3057\u307e\u3059\u3002<\/p>\n<h4 class=\"Heading Title Title--s\" id=\"Bookmark-3-1\"><span class=\"Num\">3.1.<\/span>API\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8<\/h4>\n<p>\u4e0a\u8a18\u3067\u8aac\u660e\u3057\u305f\u3068\u304a\u308a\u3001Java\u306b\u306f\u3001\u6a19\u6e96\u3067\u7528\u610f\u3055\u308c\u305f\u30af\u30e9\u30b9\u304c\u591a\u304f\u3042\u308a\u307e\u3059\u3002<br \/>\n\u3088\u304f\u4f7f\u3046\u30af\u30e9\u30b9\u3084\u305d\u308c\u3089\u306e\u30af\u30e9\u30b9\u306b\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u30d5\u30a3\u30fc\u30eb\u30c9\u3084\u30e1\u30bd\u30c3\u30c9\u3067\u3088\u304f\u4f7f\u3046\u3082\u306e\u306b\u3064\u3044\u3066\u306f\u3001\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3057\u3066\u3044\u308b\u3046\u3061\u306b\u899a\u3048\u3066\u3057\u307e\u3046\u3082\u306e\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u3057\u304b\u3057\u3001\u3042\u307e\u308a\u306b\u591a\u304f\u3042\u308a\u3059\u304e\u308b\u305f\u3081\u6b86\u3069\u306e\u30af\u30e9\u30b9\u306f\u899a\u3048\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002<br \/>\n\u30b7\u30b9\u30c6\u30e0\u958b\u767a\u3067\u3001\u73fe\u5f79\u306e\u30d7\u30ed\u30b0\u30e9\u30de\u30fc\u3068\u3057\u3066\u6d3b\u8e8d\u3057\u3066\u3044\u308b\u6280\u8853\u8005\u3082\u5168\u3066\u3092\u899a\u3048\u3066\u3044\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<br \/>\n\u958b\u767a\u306e\u3068\u304d\u306b\u3001\u90fd\u5ea6\u3001\u9069\u5207\u306a\u30af\u30e9\u30b9\u3092\u8abf\u3079\u308b\u3053\u3068\u3067\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3092\u884c\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>API\uff08\u30a8\u30fc\u30d4\u30fc\u30a2\u30a4\uff09\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3068\u306f\u3001\u305d\u3046\u3044\u3063\u305f\u30af\u30e9\u30b9\u3092\u307e\u3068\u3081\u305f\u8f9e\u66f8\u306e\u3088\u3046\u306aWeb\u30da\u30fc\u30b8\u3067\u3059\u3002<br \/>\nAPI\u3068\u306f\u3001Application Program Interface\u306e\u7565\u3067\u3001\u30af\u30e9\u30b9\u3084\u30e1\u30bd\u30c3\u30c9\u3001\u30d5\u30a3\u30fc\u30eb\u30c9\u306a\u3069\u306e\u60c5\u5831\u3067\u3059\u3002<br \/>\n\u3053\u306eAPI\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u4f7f\u3046\u3053\u3068\u306b\u3088\u3063\u3066\u3001Java\u306e\u30af\u30e9\u30b9\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u8abf\u3079\u3066\u3001\u5b9f\u969b\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u6d3b\u304b\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>API\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3067\u78ba\u8a8d\u3067\u304d\u308b\u4e3b\u306a\u60c5\u5831\u306f\u3001\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n<ul class=\"Base-list\">\n<li class=\"Base-list__child\">\u30af\u30e9\u30b9\u306e\u6982\u8981<\/li>\n<li class=\"Base-list__child\">\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3001\u30d5\u30a3\u30fc\u30eb\u30c9\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u4e00\u89a7\u3068\u8aac\u660e<\/li>\n<li class=\"Base-list__child\">\u767a\u751f\u3059\u308b\u4f8b\u5916\uff08\u4f8b\u5916\u306b\u3064\u3044\u3066\u306f\u3001\u5f8c\u8ff0\u3057\u307e\u3059\u3002\uff09<\/li>\n<li class=\"Base-list__child\">\u7d99\u627f\u95a2\u4fc2\uff08\u7d99\u627f\u306b\u3064\u3044\u3066\u306f\u3001\u5f8c\u8ff0\u3057\u307e\u3059\u3002\uff09<\/li>\n<\/ul>\n<p>\u3053\u306eAPI\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306f\u3001\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u3067\u691c\u7d22\u53ef\u80fd\u3067\u3059\u3002\u4ee5\u4e0b\u306e\u30ea\u30f3\u30af\u3092\u30af\u30ea\u30c3\u30af\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p><a href=\"https:\/\/docs.oracle.com\/javase\/jp\/17\/docs\/api\/index.html\" class=\"Post-link Ext\">API\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8<\/a><\/p>\n<p>\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u753b\u9762\u304c\u8868\u793a\u3055\u308c\u305f\u3067\u3057\u3087\u3046\u304b\u3002\u3053\u306e\u753b\u9762\u304cAPI\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306e\u753b\u9762\u3067\u3059\u3002<\/p>\n<p><a class=\"Ext Image-link\" href=\"https:\/\/techfun.cc\/wp-content\/uploads\/2024\/06\/frequently_class-javadoc1.png\"><br \/>\n\t<img decoding=\"async\" src=\"https:\/\/techfun.cc\/wp-content\/uploads\/2024\/06\/frequently_class-javadoc1.png\" alt=\"frequently class javadoc1\"><br \/>\n<\/a><\/p>\n<p>\u3053\u306e\u7ae0\u3067\u5b66\u7fd2\u3092\u59cb\u3081\u308b\u524d\u306b\u3001\u307e\u305a\u3053\u306eAPI\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306e\u4f7f\u3044\u65b9\u3092\u78ba\u8a8d\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<p>\u305d\u308c\u3067\u306f\u3001\u30c8\u30c3\u30d7\u306e\u753b\u9762\u304b\u3089\u78ba\u8a8d\u3057\u307e\u3059\u3002\u3053\u306e\u753b\u9762\u306f\u3001\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306e\u6982\u8981\u3068\u3001\u30e2\u30b8\u30e5\u30fc\u30eb\u306e\u4e00\u89a7\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<br \/>\n\u30e2\u30b8\u30e5\u30fc\u30eb\u306fJava \uff19\u3088\u308a\u5c0e\u5165\u3055\u308c\u305f\u5404\u6a5f\u80fd\u306e\u5358\u4f4d\u3067\u3059\u3002\u3053\u308c\u304b\u3089\u5b66\u7fd2\u3059\u308b\u3001\u30d1\u30c3\u30b1\u30fc\u30b8\u3001\u30af\u30e9\u30b9\u306f\u305d\u308c\u305e\u308c\u306e\u30e2\u30b8\u30e5\u30fc\u30eb\u306b\u5206\u985e\u3055\u308c\u3066\u3044\u307e\u3059\u3002<br \/>\n\u305d\u308c\u3067\u306f\u3001\u753b\u9762\u3092\u4e0b\u306e\u65b9\u306b\u30b9\u30e9\u30a4\u30c9\u3057\u3001\u8d64\u67a0\u306e\u300cjava.base\u300d\u30e2\u30b8\u30e5\u30fc\u30eb\u3092\u30af\u30ea\u30c3\u30af\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<p><a class=\"Ext Image-link\" href=\"https:\/\/techfun.cc\/wp-content\/uploads\/2024\/06\/frequently_class-javadoc2.png\"><br \/>\n\t<img decoding=\"async\" src=\"https:\/\/techfun.cc\/wp-content\/uploads\/2024\/06\/frequently_class-javadoc2.png\" alt=\"frequently class javadoc2\"><br \/>\n<\/a><\/p>\n<p>\u300cjava.base\u300d\u30e2\u30b8\u30e5\u30fc\u30eb\u306b\u5206\u985e\u3055\u308c\u3066\u3044\u308b\u3001\u30d1\u30c3\u30b1\u30fc\u30b8\u306e\u4e00\u89a7\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<br \/>\n\u30af\u30e9\u30b9\u306f\u3001\u3053\u306e\u30d1\u30c3\u30b1\u30fc\u30b8\u3068\u3044\u3046\u5358\u4f4d\u3067\u5206\u985e\u3055\u308c\u3066\u3044\u307e\u3059\u3002<br \/>\n\u3053\u306e\u30d1\u30c3\u30b1\u30fc\u30b8\u306e\u4e2d\u304b\u3089\u3001API\u3092\u78ba\u8a8d\u3057\u305f\u3044\u30af\u30e9\u30b9\u3092\u63a2\u3057\u307e\u3059\u3002<\/p>\n<p>\u4eca\u56de\u5b66\u7fd2\u3059\u308bInteger\u30af\u30e9\u30b9\u3092\u8abf\u3079\u3066\u307f\u307e\u3057\u3087\u3046\u3002Integer\u30af\u30e9\u30b9\u304c\u5c5e\u3059\u308b\u30d1\u30c3\u30b1\u30fc\u30b8\u306f\u3001\u300cjava.lang\u300d\u3068\u3044\u3046\u30d1\u30c3\u30b1\u30fc\u30b8\u3067\u3059\u3002<br \/>\n\u300cjava.lang\u300d\u3092\u63a2\u3057\u3066\u30af\u30ea\u30c3\u30af\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p><a class=\"Ext Image-link\" href=\"https:\/\/techfun.cc\/wp-content\/uploads\/2024\/06\/frequently_class-javadoc3.png\"><br \/>\n\t<img decoding=\"async\" src=\"https:\/\/techfun.cc\/wp-content\/uploads\/2024\/06\/frequently_class-javadoc3.png\" alt=\"frequently class javadoc3\"><br \/>\n<\/a><\/p>\n<p>\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u753b\u9762\u304c\u51fa\u3066\u304d\u307e\u3059\u3002\u3053\u306e\u753b\u9762\u3092\u30b9\u30e9\u30a4\u30c9\u3055\u305b\u3001\u300cInteger\u300d\u30af\u30e9\u30b9\u3092\u63a2\u3057\u3066\u30af\u30ea\u30c3\u30af\u3057\u3066\u304f\u3060\u3055\u3044\u3002<br \/>\n\u306a\u304a\u3001\u53f3\u4e0a\u306e\u691c\u7d22\u6b04\u304b\u3089\u63a2\u3059\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<p><a class=\"Ext Image-link\" href=\"https:\/\/techfun.cc\/wp-content\/uploads\/2024\/06\/frequently_class-javadoc4.png\"><br \/>\n\t<img decoding=\"async\" src=\"https:\/\/techfun.cc\/wp-content\/uploads\/2024\/06\/frequently_class-javadoc4.png\" alt=\"frequently class javadoc4\"><br \/>\n<\/a><\/p>\n<p>\u300cInteger\u300d\u30af\u30e9\u30b9\u3092\u30af\u30ea\u30c3\u30af\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u753b\u9762\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n<p><a class=\"Ext Image-link\" href=\"https:\/\/techfun.cc\/wp-content\/uploads\/2024\/06\/frequently_class-javadoc5.png\"><br \/>\n\t<img decoding=\"async\" src=\"https:\/\/techfun.cc\/wp-content\/uploads\/2024\/06\/frequently_class-javadoc5.png\" alt=\"frequently class javadoc5\"><br \/>\n<\/a><\/p>\n<p>\u3053\u306e\u753b\u9762\u304c\u3001Integer\u30af\u30e9\u30b9\u306e\u8aac\u660e\u304c\u8a18\u8ff0\u3055\u308c\u305f\u753b\u9762\u3067\u3059\u3002<br \/>\n\u3059\u3067\u306b\u5b9a\u7fa9\u3055\u308c\u305f\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3084\u30d5\u30a3\u30fc\u30eb\u30c9\u3001\u30e1\u30bd\u30c3\u30c9\u306a\u3069\u304c\u4e00\u89a7\u3067\u7d39\u4ecb\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u304c\u78ba\u8a8d\u3067\u304d\u305f\u3067\u3057\u3087\u3046\u304b\u3002<br \/>\n\u5404\u30e1\u30bd\u30c3\u30c9\u3084\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u30af\u30ea\u30c3\u30af\u3059\u308b\u3068\u3001\u305d\u308c\u3089\u306e\u8aac\u660e\u304c\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u3088\u3046\u306b\u3001API\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306f\u6a19\u6e96\u3067\u7528\u610f\u3055\u308c\u3066\u3044\u308b\u30af\u30e9\u30b9\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u8abf\u3079\u308b\u3068\u304d\u306b\u5229\u7528\u3057\u307e\u3059\u3002<br \/>\n\u4f8b\u3048\u3070\u3001\u30af\u30e9\u30b9\u3092\u691c\u7d22\u3057\u305f\u308a\u3001\u307e\u305f\u30af\u30e9\u30b9\u306e\u4e2d\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u8abf\u3079\u305f\u308a\u3059\u308b\u3068\u304d\u306b\u6709\u52b9\u3067\u3059\u3002<br \/>\n\u3053\u306e\u7ae0\u306e\u5b66\u7fd2\u306e\u4e2d\u3067\u51fa\u3066\u304f\u308b\u30af\u30e9\u30b9\u306b\u3064\u3044\u3066\u306f\u3001\u90fd\u5ea6API\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3067\u78ba\u8a8d\u3057\u3001\u4f7f\u3044\u65b9\u306b\u6163\u308c\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\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\">\u3088\u304f\u4f7f\u3046\u30d1\u30c3\u30b1\u30fc\u30b8<\/div>\n<p>\tJava\u306e\u6a19\u6e96\u30af\u30e9\u30b9\u3092\u5206\u985e\u3057\u3066\u3044\u308b\u30d1\u30c3\u30b1\u30fc\u30b8\u306e\u4e2d\u3067\u3088\u304f\u4f7f\u3046\u30d1\u30c3\u30b1\u30fc\u30b8\u306b\u3064\u3044\u3066\u3001\u4ee5\u4e0b\u306b\u8a18\u8f09\u3057\u3066\u304a\u304d\u307e\u3059\u3002<br \/>\n\t\u4eca\u5f8c\u3001\u5c11\u3057\u305a\u3064\u3001\u3053\u308c\u3089\u306e\u30d1\u30c3\u30b1\u30fc\u30b8\u306b\u3042\u308b\u30af\u30e9\u30b9\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3066\u304a\u304f\u3068\u826f\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n<table class=\"Base-table\">\n<colgroup>\n<col>\n<col>\n\t\t<\/colgroup>\n<thead>\n<tr>\n<th>\u30d1\u30c3\u30b1\u30fc\u30b8\u540d<\/th>\n<th>\u8aac\u660e<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\n\t\t\t\t\tjava.lang\n\t\t\t\t<\/td>\n<td>\n\t\t\t\t\tJava\u306e\u57fa\u672c\u30af\u30e9\u30b9\n\t\t\t\t<\/td>\n<\/tr>\n<tr>\n<td>\n\t\t\t\t\tjava.util\n\t\t\t\t<\/td>\n<td>\n\t\t\t\t\t\u6c4e\u7528\u7684\u306a\u5404\u7a2e\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u30af\u30e9\u30b9\n\t\t\t\t<\/td>\n<\/tr>\n<tr>\n<td>\n\t\t\t\t\tjava.io\n\t\t\t\t<\/td>\n<td>\n\t\t\t\t\t\u5165\u51fa\u529b\u7528\u30af\u30e9\u30b9\n\t\t\t\t<\/td>\n<\/tr>\n<tr>\n<td>\n\t\t\t\t\tjava.sql\n\t\t\t\t<\/td>\n<td>\n\t\t\t\t\t\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u95a2\u9023\u306e\u30af\u30e9\u30b9\n\t\t\t\t<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h4 class=\"Heading Title Title--s\" id=\"Bookmark-3-2\"><span class=\"Num\">3.2.<\/span>Javadoc\u30b3\u30e1\u30f3\u30c8<\/h4>\n<p>\u4e0a\u8a18\u3067\u8aac\u660e\u3057\u305fAPI\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306b\u8a18\u8f09\u3055\u308c\u3066\u3044\u308b\u3088\u3046\u306a\u3001\u30af\u30e9\u30b9\u3084\u30e1\u30bd\u30c3\u30c9\u306e\u6982\u8981\u3001\u623b\u308a\u5024\u3084\u5f15\u6570\u306e\u5b9a\u7fa9\u306b\u3064\u3044\u3066\u3001\u81ea\u8eab\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306b\u3082\u8a18\u8f09\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br \/>\n\u305d\u308c\u3092Javadoc\u30b3\u30e1\u30f3\u30c8\u3068\u3044\u3044\u307e\u3059\u3002<br \/>\nJavadoc\u30b3\u30e1\u30f3\u30c8\u306f\u3001\u5b9a\u3081\u3089\u308c\u305f\u8a18\u6cd5\u306b\u5247\u3063\u3066\u3001\u30af\u30e9\u30b9\u3084\u30e1\u30bd\u30c3\u30c9\u3001\u30d5\u30a3\u30fc\u30eb\u30c9\u306b\u4ed8\u4e0e\u3057\u307e\u3059\u3002<br \/>\n\u4ee5\u4e0b\u306b\u3001\u30af\u30e9\u30b9\u3001\u30d5\u30a3\u30fc\u30eb\u30c9\u3001\u30e1\u30bd\u30c3\u30c9\u305d\u308c\u305e\u308c\u306bJavadoc\u30b3\u30e1\u30f3\u30c8\u3092\u8a18\u8f09\u3057\u305f\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n<div class=\"Pre-title\">StudentName.java<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>\/**\r\n * \u751f\u5f92\u306e\u540d\u524d\u3092\u6271\u3046\u30af\u30e9\u30b9\r\n * @author techfun\r\n *\r\n *\/\r\npublic class StudentName {\r\n\t\/**\r\n\t * \u751f\u5f92\u540d\u30d5\u30a3\u30fc\u30eb\u30c9\r\n\t *\/\r\n\tString name;\r\n\r\n\t\/**\r\n\t * \u540d\u524d\u3092\u5f15\u6570\u3068\u3057\u3066\u53d7\u3051\u53d6\u308a\u3001\r\n\t * \u751f\u5f92\u540d\u30d5\u30a3\u30fc\u30eb\u30c9\u306b\u30bb\u30c3\u30c8\u3059\u308b\r\n\t * @param tName \u540d\u524d\r\n\t *\/\r\n\tvoid setName(String tName) {\r\n\t\tname = tName;\r\n\t}\r\n\r\n\t\/**\r\n\t * \u751f\u5f92\u540d\u3092\u623b\u308a\u5024\u3068\u3057\u3066\u8fd4\u3059\r\n\t * @return name \u751f\u5f92\u540d\r\n\t *\/\r\n\tString getName() {\r\n\t\treturn name;\r\n\t}\r\n}<\/code><\/pre>\n<p>Javadoc\u30b3\u30e1\u30f3\u30c8\u306f\u3001\u30b3\u30e1\u30f3\u30c8\u306e\u4e00\u7a2e\u3067\u3042\u308b\u305f\u3081\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u5b9f\u884c\u6642\u306e\u52d5\u4f5c\u306b\u5f71\u97ff\u306f\u3042\u308a\u307e\u305b\u3093\u3002<br \/>\n\u300c\/**\u300d\u3068\u300c*\/\u300d\u3067\u56f2\u307f\u3001\u305d\u306e\u9593\u306b\u8a18\u8f09\u3057\u3066\u3044\u304d\u307e\u3059\u3002<br \/>\nEclipse\u306b\u306f\u3001Javadoc\u30b3\u30e1\u30f3\u30c8\u3092\u7c21\u5358\u306b\u8a18\u8f09\u3059\u308b\u305f\u3081\u306e\u6a5f\u80fd\u304c\u3042\u308a\u307e\u3059\u3002<br \/>\n\u3069\u306e\u30e1\u30bd\u30c3\u30c9\u3067\u3082\u69cb\u3044\u307e\u305b\u3093\u306e\u3067\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u5b9a\u7fa9\u306e1\u884c\u4e0a\u306b\u30ab\u30fc\u30bd\u30eb\u6301\u3063\u3066\u3044\u304d\u3001\u300c\/**\u300d\u3068\u5165\u529b\u3057\u3066Enter\u30ad\u30fc\u3092\u62bc\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>\/**\r\n *\r\n * @param tName\r\n *\/\r\nvoid setName(String tName) {\r\n\tname = tName;\r\n}<\/code><\/pre>\n<p>\u81ea\u52d5\u7684\u306b\u300c*\uff08\u30a2\u30b9\u30bf\u30ea\u30b9\u30af\uff09\u300d\u3068\u3001Javadoc\u30b3\u30e1\u30f3\u30c8\u306e\u7d42\u308f\u308a\u3092\u8868\u3059\u300c*\/\u300d\u304c\u5165\u529b\u3055\u308c\u3001 \u4e0a\u8a18\u306e\u4f8b\u3060\u3068\u3001\u305d\u306e\u9593\u306b\u300c@param\u300d\u3068\u5165\u529b\u3055\u308c\u307e\u3059\u3002<br \/>\n\u3053\u3061\u3089\u306b\u8ffd\u8a18\u3059\u308b\u304b\u305f\u3061\u3067\u3001Javadoc\u30b3\u30e1\u30f3\u30c8\u3092\u8a18\u8ff0\u3057\u3066\u3044\u304d\u307e\u3059\u3002<br \/>\n\u57fa\u672c\u7684\u306b\u306f1\u884c\u76ee\u306b\u51e6\u7406\u6982\u8981\u30012\u884c\u76ee\u4ee5\u4e0b\u306b\u30af\u30e9\u30b9\u306e\u4f5c\u6210\u8005\u3084\u3001\u5f15\u6570\u3084\u623b\u308a\u5024\u306e\u60c5\u5831\u3092\u8a18\u8ff0\u3057\u307e\u3059\u3002<br \/>\n\u30af\u30e9\u30b9\u306eJavadoc\u30b3\u30e1\u30f3\u30c8\u306e\u300c@author\u300d\u306b\u306f\u30af\u30e9\u30b9\u306e\u4f5c\u6210\u8005\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u300c@param\u300d\u306b\u306f\u5f15\u6570\u3001\u300c@return\u300d\u306b\u306f\u623b\u308a\u5024\u3092\u305d\u308c\u305e\u308c\u8a18\u8f09\u3057\u307e\u3059\u3002<br \/>\nJavadoc\u30b3\u30e1\u30f3\u30c8\u306b\u8a18\u8ff0\u3059\u3079\u304d\u5185\u5bb9\u306f\u3001\u4e0a\u8a18\u3067\u8aac\u660e\u3057\u305fAPI\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306b\u8a18\u8f09\u3055\u308c\u3066\u3044\u308b\u60c5\u5831\u3068\u307b\u307c\u540c\u7fa9\u3067\u3042\u308b\u3068\u8003\u3048\u3066\u304f\u3060\u3055\u3044\u3002<br \/>\n\u3064\u307e\u308a\u3001\u305d\u306eJavadoc\u30b3\u30e1\u30f3\u30c8\u3092\u898b\u308c\u3070\u3001\u30af\u30e9\u30b9\u3084\u30e1\u30bd\u30c3\u30c9\u306e\u6982\u8981\u3001\u623b\u308a\u5024\u3084\u5f15\u6570\u3001\u7d99\u627f\u95a2\u4fc2\u306a\u3069\u304c\u5168\u3066\u308f\u304b\u308b\u3088\u3046\u306bJavadoc\u30b3\u30e1\u30f3\u30c8\u3092\u66f8\u3044\u3066\u3044\u304f\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u958b\u767a\u73fe\u5834\u306b\u3088\u3063\u3066\u66f8\u304d\u65b9\u306e\u30eb\u30fc\u30eb\u304c\u7570\u306a\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u539f\u5247\u3001<span\n\tclass=\"Text-highlight\">\u3059\u3079\u3066\u306e\u30af\u30e9\u30b9\u3068\u30e1\u30bd\u30c3\u30c9<\/span>\uff08\u30d5\u30a3\u30fc\u30eb\u30c9\u306b\u3064\u3044\u3066\u306f\u901a\u5e38\u306e\u30b3\u30e1\u30f3\u30c8\u3067\u8a18\u8f09\u3059\u308b\u5834\u5408\u3082\u3042\u308b\uff09\u306b\u8a18\u8ff0\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u3067\u306f\u3001Javadoc\u30b3\u30e1\u30f3\u30c8\u3092\u8a18\u8ff0\u3059\u308b\u3053\u3068\u3067\u3069\u306e\u3088\u3046\u306a\u30e1\u30ea\u30c3\u30c8\u304c\u3042\u308b\u306e\u304b\u3092\u898b\u3066\u3044\u304d\u307e\u3059\u3002<br \/>\n\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3001\u5229\u7528\u3059\u308b\u30af\u30e9\u30b9\u3067\u30e1\u30bd\u30c3\u30c9\u540d\u306b\u30ab\u30fc\u30bd\u30eb\u3092\u3042\u3066\u3066\u3001\u300cF2\u300d\u30ad\u30fc\u3092\u62bc\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p><a class=\"Ext Image-link\" href=\"https:\/\/techfun.cc\/wp-content\/uploads\/2024\/06\/kari1.png\"><br \/>\n\t<img decoding=\"async\" src=\"https:\/\/techfun.cc\/wp-content\/uploads\/2024\/06\/kari1.png\" alt=\"(kari)1\"><br \/>\n<\/a><\/p>\n<p>StudentName\u30af\u30e9\u30b9\u306e\u3001setName\u30e1\u30bd\u30c3\u30c9\u306eJavadoc\u30b3\u30e1\u30f3\u30c8\u3092\u3053\u306e\u3088\u3046\u306b\u5229\u7528\u3059\u308b\u30af\u30e9\u30b9\u3067\u53c2\u7167\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br \/>\n\u5927\u898f\u6a21\u306a\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u3092\u958b\u767a\u3059\u308b\u5834\u5408\u3001\u591a\u4eba\u6570\u3067\u30b3\u30fc\u30c9\u3092\u5171\u6709\u3057\u305f\u308a\u3001\u4fee\u6b63\u3057\u3066\u3044\u304f\u3053\u3068\u304c\u3088\u304f\u3042\u308a\u307e\u3059\u3002<br \/>\n\u4ed6\u306e\u4eba\u304c\u898b\u3066\u3082\u308f\u304b\u308a\u3084\u3059\u3044\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3092\u884c\u3063\u3066\u3044\u304f\u3053\u3068\u306f\u3001\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u6027\u306e\u5411\u4e0a\u3084\u3001\u30d0\u30b0\u306e\u9632\u6b62\u3001\u958b\u767a\u52b9\u7387\u306e\u5411\u4e0a\u306b\u5fc5\u8981\u4e0d\u53ef\u6b20\u3067\u3059\u3002<br \/>\nJavadoc\u30b3\u30e1\u30f3\u30c8\u306b\u3064\u3044\u3066\u306f\u3001\u4eca\u5f8c\u610f\u8b58\u3057\u3066\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3092\u884c\u3063\u3066\u3044\u304f\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<br \/>\n\u306a\u304a\u3001\u3053\u306e\u6559\u6750\u3067\u7d39\u4ecb\u3059\u308b\u30d7\u30ed\u30b0\u30e9\u30e0\u306b\u3064\u3044\u3066\u306f\u3001\u6559\u6750\u306e\u898b\u3084\u3059\u3055\u306e\u305f\u3081\u306bJavadoc\u30b3\u30e1\u30f3\u30c8\u306b\u3064\u3044\u3066\u306f\u7701\u7565\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\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\">Javadoc<\/div>\n<p>\tJavadoc\u3068\u306f\u3001Javadoc\u30b3\u30e1\u30f3\u30c8\u304c\u8a18\u8ff0\u3055\u308c\u305f\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u304b\u3089\u3001API\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306eHTML\u30da\u30fc\u30b8\u3092\u751f\u6210\u3059\u308b\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u306e\u3053\u3068\u3067\u3059\u3002Javadoc\u306e\u7d30\u304b\u306a\u4ed5\u69d8\u306b\u3064\u3044\u3066\u306f\u3001<a\n\t\thref=\"https:\/\/docs.oracle.com\/javase\/jp\/17\/docs\/specs\/man\/javadoc.html\" class=\"Post-link Ext\">\u3053\u3061\u3089<\/a>\u3092\u3054\u53c2\u7167\u304f\u3060\u3055\u3044\u3002<\/p>\n<p>\tStudentName\u30af\u30e9\u30b9\u3092Javadoc\u3067API\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306b\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\t<a class=\"Ext Image-link\" href=\"https:\/\/techfun.cc\/wp-content\/uploads\/2024\/06\/javadoc6.png\"><br \/>\n\t\t<img decoding=\"async\" src=\"https:\/\/techfun.cc\/wp-content\/uploads\/2024\/06\/javadoc6.png\" alt=\"javadoc6\"><br \/>\n\t<\/a>\n<\/div>\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>\u30e9\u30c3\u30d1\u30fc\u30af\u30e9\u30b9<\/h3>\n<p>\u3088\u304f\u4f7f\u3046\u30af\u30e9\u30b9\u3068\u3057\u3066\u3001\u6700\u521d\u306b\u30e9\u30c3\u30d1\u30fc\u30af\u30e9\u30b9\u3092\u5b66\u7fd2\u3057\u307e\u3059\u3002<\/p>\n<p>Java\u306b\u306f\u3001\u57fa\u672c\u30c7\u30fc\u30bf\u578b\u3068\u53c2\u7167\u578b\u304c\u3042\u308a\u307e\u3057\u305f\u304c\u3001\u5b9f\u969b\u306eJava\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u306f99%\u304c\u53c2\u7167\u578b\u3067\u3042\u308a\u3001\u57fa\u672c\u30c7\u30fc\u30bf\u578b\u306f\u7279\u6b8a\u306a\u578b\u3067\u3059\u3002<br \/>\n\u305d\u306e\u305f\u3081\u3001\u3042\u308b\u30c7\u30fc\u30bf\uff08\u5024\uff09\u3092\u57fa\u672c\u30c7\u30fc\u30bf\u578b\u306e\u307e\u307e\u3067\u6271\u3046\u3068\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u4e2d\u3067\u5229\u7528\u3057\u306b\u304f\u3044\u3053\u3068\u304c\u3042\u308a\u3001\u57fa\u672c\u30c7\u30fc\u30bf\u578b\u3067\u306a\u304f\u3001\u53c2\u7167\u578b\u304b\u3089\u751f\u6210\u3055\u308c\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u3057\u3066\u6271\u3044\u305f\u3044\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u305d\u3093\u306a\u3068\u304d\u306b\u4f7f\u7528\u3059\u308b\u306e\u304c\u3001<span\n\tclass=\"Text-highlight\">\u30e9\u30c3\u30d1\u30fc\u30af\u30e9\u30b9<\/span>\u3067\u3059\u3002\u30e9\u30c3\u30d1\u30fc\u30af\u30e9\u30b9\u306f\u3001\u57fa\u672c\u30c7\u30fc\u30bf\u578b\u3092\u53c2\u7167\u578b\u306b\u5909\u63db\u3059\u308b\u6a5f\u80fd\u3092\u6301\u3063\u3066\u304a\u308a\u3001\u57fa\u672c\u30c7\u30fc\u30bf\u578b\u3067\u3042\u308b\u30c7\u30fc\u30bf\uff08\u5024\uff09\u3092\u53c2\u7167\u578b\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5909\u63db\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br \/>\n\u53c2\u7167\u578b\u306b\u5909\u63db\u3059\u308b\u3053\u3068\u306b\u3088\u308a\u3001\u4f8b\u3048\u3070\u3001\u305d\u306e\u30c7\u30fc\u30bf\uff08\u5024\uff09\u3092\u3001\u30e1\u30bd\u30c3\u30c9\u306716\u9032\u6570\u306b\u5909\u63db\u3057\u305f\u308a\u3001\u4e00\u90e8\u306e\u6587\u5b57\u5217\u3092\u629c\u304d\u51fa\u3057\u305f\u308a\u3001\u6587\u5b57\u5217\u5909\u63db\u3092\u884c\u3063\u305f\u308a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br \/>\n\u30e9\u30c3\u30d1\u30fc\u30af\u30e9\u30b9\u306f\u3001java.lang\u30d1\u30c3\u30b1\u30fc\u30b8\u306b\u5c5e\u3057\u30018\u7a2e\u985e\u306e\u57fa\u672c\u30c7\u30fc\u30bf\u578b\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u306e\u5404\u30e9\u30c3\u30d1\u30fc\u30af\u30e9\u30b9\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<table class=\"Base-table\">\n<colgroup>\n<col>\n<col>\n\t<\/colgroup>\n<thead>\n<tr>\n<th>\u30e9\u30c3\u30d1\u30fc\u30af\u30e9\u30b9\u540d<\/th>\n<th>\u5bfe\u5fdc\u57fa\u672c\u30c7\u30fc\u30bf\u578b<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\n\t\t\t\tByte\n\t\t\t<\/td>\n<td>\n\t\t\t\tbyte\n\t\t\t<\/td>\n<\/tr>\n<tr>\n<td>\n\t\t\t\tShort\n\t\t\t<\/td>\n<td>\n\t\t\t\tshort\n\t\t\t<\/td>\n<\/tr>\n<tr>\n<td>\n\t\t\t\tInteger\n\t\t\t<\/td>\n<td>\n\t\t\t\tint\n\t\t\t<\/td>\n<\/tr>\n<tr>\n<td>\n\t\t\t\tLong\n\t\t\t<\/td>\n<td>\n\t\t\t\tlong\n\t\t\t<\/td>\n<\/tr>\n<tr>\n<td>\n\t\t\t\tFloat\n\t\t\t<\/td>\n<td>\n\t\t\t\tfloat\n\t\t\t<\/td>\n<\/tr>\n<tr>\n<td>\n\t\t\t\tDouble\n\t\t\t<\/td>\n<td>\n\t\t\t\tdouble\n\t\t\t<\/td>\n<\/tr>\n<tr>\n<td>\n\t\t\t\tCharacter\n\t\t\t<\/td>\n<td>\n\t\t\t\tchar\n\t\t\t<\/td>\n<\/tr>\n<tr>\n<td>\n\t\t\t\tBoolean\n\t\t\t<\/td>\n<td>\n\t\t\t\tboolean\n\t\t\t<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u305d\u308c\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u30e9\u30c3\u30d1\u30fc\u30af\u30e9\u30b9\u306e\u3046\u3061\u3001Integer\u30af\u30e9\u30b9\u306b\u3064\u3044\u3066\u3001\u5b66\u7fd2\u3057\u307e\u3057\u3087\u3046\u3002<br \/>\n\u305d\u306e\u4ed6\u306e\u30e9\u30c3\u30d1\u30fc\u30af\u30e9\u30b9\u3082\u540c\u69d8\u306a\u6a5f\u80fd\u3092\u6301\u3063\u3066\u3044\u307e\u3059\u306e\u3067\u3001Javadoc\u3092\u78ba\u8a8d\u3057\u3066\u307f\u308b\u3068\u826f\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n<h4 class=\"Heading Title Title--s\" id=\"Bookmark-4-1\"><span class=\"Num\">4.1.<\/span>Integer\u30af\u30e9\u30b9<\/h4>\n<p>\u57fa\u672c\u30c7\u30fc\u30bf\u578b\u3092\u4ee3\u8868\u3057\u3066\u3001int\u578b\u306e\u30e9\u30c3\u30d1\u30fc\u30af\u30e9\u30b9\u3067\u3042\u308b\u3001Integer\u30af\u30e9\u30b9\u3092\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n<h5 class=\"Heading Title Title--xs\" id=\"Bookmark-4-1-1\"><span class=\"Num\">4.1.1.<\/span>Integer\u30af\u30e9\u30b9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5909\u63db<\/h5>\n<p>Integer\u30af\u30e9\u30b9\u306b\u306fint\u578b\u306e\u5909\u6570\u3092\u6271\u3046\u4fbf\u5229\u306a\u30e1\u30bd\u30c3\u30c9\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\u3002<br \/>\nInteger\u30af\u30e9\u30b9\u306e\u6a5f\u80fd\u3092\u5229\u7528\u3057\u305f\u3044\u3068\u304d\u306f\u3001int\u578b\u306e\u5909\u6570\u3084\u5024\u3092Integer\u30af\u30e9\u30b9\u306b\u5909\u63db\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<br \/>\nint\u578b\u306e\u5909\u6570\u3084\u5024\u3092Integer\u30af\u30e9\u30b9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5909\u63db\u3059\u308b\u306b\u306f\u3001\u30af\u30e9\u30b9\u30e1\u30bd\u30c3\u30c9valueOf\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>Integer \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u540d = Integer.valueOf(\u5909\u63db\u3057\u305f\u3044int\u578b\u306e\u5909\u6570\u307e\u305f\u306f\u5024);<\/code><\/pre>\n<p>\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u66f8\u304f\u3068\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002int\u578b\u306e3\u3092Integer\u30af\u30e9\u30b9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8myI\u306b\u5909\u63db\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>\/\/ int\u578b\u306e3\u3092Integer\u30af\u30e9\u30b9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8myI\u306b\u5909\u63db\r\nInteger myI = Integer.valueOf(3); \/\/ int\u578b\u306e3\u3092\u3082\u3064Integer\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u751f\u6210\r\nSystem.out.println(myI); \/\/ 3\u304c\u8868\u793a\u3055\u308c\u307e\u3059<\/code><\/pre>\n<p>valueOf\u30e1\u30bd\u30c3\u30c9\u306b\u306f\u3001valueOf(10)\u306e\u3088\u3046\u306bint\u578b\u306e\u5f15\u6570\u3092\u6301\u3064\u3082\u306e\u3068\u3001valueOf(&quot;10&quot;)\u306e\u3088\u3046\u306bString\u578b\u3092\u6301\u3064\u3082\u306e\u304c\u3042\u308a\u307e\u3059\u3002<br \/>\n\u5f15\u6570\u306bString\u578b\u3092\u6301\u3064\u30e1\u30bd\u30c3\u30c9\u306e\u5834\u5408\u3001Integer\u578b\u306b\u5909\u63db\u3067\u304d\u306a\u3044\u6570\u5b57\u3067\u306a\u3044\u6587\u5b57\u5217\u3092\u6e21\u3059\u3068\u3001NumberFormatException\u4f8b\u5916\u3068\u3044\u3046\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3059\u3002\uff08\u4f8b\u5916\u306b\u3064\u3044\u3066\u306f\u3001\u5f8c\u8ff0\u3057\u307e\u3059\u3002\uff09<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>\/\/ int\u578b\u307e\u305f\u306fString\u578b\u306e10\u3092Integer\u30af\u30e9\u30b9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8myI\u306b\u5909\u63db\r\nInteger myI = Integer.valueOf(10); \/\/ int\u578b10\u3092\u3082\u3064Integer\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u751f\u6210\r\nInteger myI = Integer.valueOf(\"10\"); \/\/ String\u578b10\u3092\u3082\u3064Integer\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u751f\u6210\r\n\r\n\/\/ String\u578b\u306e\"\u3042\"\u3092Integer\u30af\u30e9\u30b9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8myI\u306b\u5909\u63db\u3059\u308b\u3068\u30a8\u30e9\u30fc\u767a\u751f\r\nInteger myI = Integer.valueOf(\"\u3042\"); \/\/ NumberFormatException \u4f8b\u5916\u767a\u751f<\/code><\/pre>\n<h5 class=\"Heading Title Title--xs\" id=\"Bookmark-4-1-2\"><span class=\"Num\">4.1.2.<\/span>Integer\u30af\u30e9\u30b9\u306e\u30e1\u30bd\u30c3\u30c9<\/h5>\n<p>Integer\u30af\u30e9\u30b9\u306b\u306f\u3001valueOf\u30e1\u30bd\u30c3\u30c9\u306e\u4ed6\u306b\u3082\u591a\u304f\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308a\u307e\u3059\u3002\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30e1\u30bd\u30c3\u30c9\u3068\u30af\u30e9\u30b9\u30e1\u30bd\u30c3\u30c9\u306e\u4e21\u65b9\u304c\u3042\u308a\u3001\u305d\u308c\u305e\u308c\u4f7f\u3044\u65b9\u306f\u9055\u3063\u3066\u304d\u307e\u3059\u3002<\/p>\n<p>Integer\u30af\u30e9\u30b9\u306e\u4e3b\u8981\u306a\u30af\u30e9\u30b9\u30e1\u30bd\u30c3\u30c9\u306b\u3064\u3044\u3066\u3001\u3044\u304f\u3064\u304b\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<br \/>\n\u30af\u30e9\u30b9\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\u3059\u308b\u5fc5\u8981\u304c\u306a\u3044\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u306e\u3067\u3001\u300cInteger.\u300d\u306b\u30e1\u30bd\u30c3\u30c9\u540d\u3092\u8a18\u8ff0\u3057\u3001\u5909\u63db\u3057\u305f\u3044\u6570\u5024\u3092\u5f15\u6570\u3092\u5f15\u304d\u6e21\u3057\u307e\u3059\u3002valueOf\u30e1\u30bd\u30c3\u30c9\u3082\u305d\u306e\u4e00\u3064\u3067\u3059\u3002<\/p>\n<p>10\u9032\u6570\u306e\u6570\u5024\u30922\u9032\u6570\u306b\u5909\u63db\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u30af\u30e9\u30b9\u30e1\u30bd\u30c3\u30c9toBinaryString\u30e1\u30bd\u30c3\u30c9\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<br \/>\n\u4ee5\u4e0b\u304c\u30b5\u30f3\u30d7\u30eb\u30bd\u30fc\u30b9\u3067\u3059\u300210\u9032\u6570\u306e\u6570\u50243\u30922\u9032\u6570\u8868\u8a18\u306e11\u306b\u5909\u63db\u3057\u3066\u3044\u307e\u3059\u3002<br \/>\n\u5b9f\u884c\u3059\u308b\u3068\u3001\u30b3\u30f3\u30bd\u30fc\u30eb\u306b\u306f3\u306e2\u9032\u6cd5\u8868\u8a18\u3067\u3042\u308b\u300c11\u300d\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>\/\/ 10\u9032\u6570\u306e\u6570\u50243\u30922\u9032\u6570\u306b\u5909\u63db\r\nSystem.out.println(Integer.toBinaryString(3)); \/\/ 3\u306e2\u9032\u6570\u6cd5\u8868\u8a18\u3067\u3042\u308b11\u3092\u8868\u793a<\/code><\/pre>\n<p>\u305d\u306e\u4ed6\u306eInteger\u30af\u30e9\u30b9\u306e\u4e3b\u8981\u306a\u30af\u30e9\u30b9\u30e1\u30bd\u30c3\u30c9\u3092\u5229\u7528\u3057\u305f\u30b5\u30f3\u30d7\u30eb\u30bd\u30fc\u30b9\u3067\u3059\u3002\u8a73\u7d30\u306fJavadoc\u3092\u53c2\u7167\u3057\u306a\u304c\u3089\u5b66\u7fd2\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<div class=\"Pre-title\">MyInteger1.java<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>\/\/ Integer\u30af\u30e9\u30b9\u306e\u30af\u30e9\u30b9\u30e1\u30bd\u30c3\u30c9\r\npublic class MyInteger1 {\r\n\tpublic static void main(String[] args) {\r\n\t\t\/\/ \u6587\u5b57\u5217\uff08\u6570\u5b57\uff09\u3092int\u306b\u5909\u63db\r\n\t\t\/\/ \u6587\u5b57\u521720\u3092int\u578b\u306b\u5909\u63db\r\n\t\tSystem.out.println(Integer.parseInt(\"20\"));\r\n\r\n\t\t\/\/ 16\u9032\u6570\u8868\u8a18\u306e1E\u3092int\u578b\uff0810\u9032\u6570\uff09\u306e30\u306b\u5909\u63db\r\n\t\tSystem.out.println(Integer.parseInt(\"1E\", 16));\r\n\r\n\t\t\/\/ \u6587\u5b57\u5217\uff08\u6570\u5b57\uff09\u3092Integer\u306b\u5909\u63db\uff08\u57fa\u6570\u306f\u6570\u5b57\u3067\u6307\u5b9a\uff09\r\n\t\t\/\/ \u6587\u5b57\u521764(16\u9032\u6570\u8868\u8a18)\u309210\u9032\u6570\u8868\u8a18100\u306b\u5909\u63db\u3057\u3001Integer\u30af\u30e9\u30b9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5909\u63db\r\n\t\tSystem.out.println(Integer.valueOf(\"64\",16));\r\n\t}\r\n}<\/code><\/pre>\n<div class=\"Pre-title\">\u56f31 \u4e0a\u8a18\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5b9f\u884c\u3057\u305f\u5834\u5408\u306e\u51fa\u529b<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>20\r\n30\r\n100<\/code><\/pre>\n<p>\u6b21\u306b\u3001Integer\u30af\u30e9\u30b9\u306e\u4e3b\u8981\u306a\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30e1\u30bd\u30c3\u30c9\u306b\u3064\u3044\u3066\u3001\u3044\u304f\u3064\u304b\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<br \/>\n\u4ee5\u4e0b\u306bInteger\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30e1\u30bd\u30c3\u30c9\u3092\u5229\u7528\u3057\u305f\u30b5\u30f3\u30d7\u30eb\u30bd\u30fc\u30b9\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<br \/>\n\u8a73\u7d30\u306f\u3001Javadoc\u3092\u53c2\u7167\u3057\u306a\u304c\u3089\u3001\u5b66\u7fd2\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<div class=\"Pre-title\">MyInteger2.java<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>\/\/ Integer\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30e1\u30bd\u30c3\u30c9\r\npublic class MyInteger2 {\r\n\tpublic static void main(String[] args) {\r\n\t\t\/\/ Integer\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u751f\u6210\r\n\t\t\/\/ int\u578b100\u306e\u5024\u3092\u6301\u3064Integer\u30af\u30e9\u30b9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8myI1\u3092\u751f\u6210\r\n\t\tInteger myI1 = Integer.valueOf(100);\r\n\r\n\t\t\/\/ int\u578b100\u306e\u5024\u3092\u6301\u3064Integer\u30af\u30e9\u30b9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8myI2\u3092\u751f\u6210\r\n\t\tInteger myI2 = Integer.valueOf(100);\r\n\r\n\t\t\/\/ \u5404\u30c7\u30fc\u30bf\u578b\u3078\u306e\u5909\u63db\r\n\t\tint i = myI1.intValue(); \/\/ myI1\u306e\u5024\u3092int\u578b\u306b\u5909\u63db\r\n\t\tlong l = myI1.longValue(); \/\/ myI1\u306e\u5024\u3092long\u578b\u306b\u5909\u63db\r\n\t\tfloat f = myI1.floatValue(); \/\/ myI1\u306e\u5024\u3092float\u578b\u306b\u5909\u63db\r\n\t\tdouble d = myI1.doubleValue(); \/\/ myI1\u306e\u5024\u3092double\u578b\u306b\u5909\u63db\r\n\t\tString st = myI1.toString(); \/\/ myI1\u306e\u5024\u3092String\u578b\u306b\u5909\u63db\r\n\t}\r\n}<\/code><\/pre>\n<p>Integer\u30af\u30e9\u30b9\u306e\u4f7f\u3044\u65b9\u3001\u8abf\u3079\u65b9\u306f\u7fd2\u5f97\u3067\u304d\u305f\u3067\u3057\u3087\u3046\u304b\u3002\u305d\u306e\u4ed6\u306e\u30e9\u30c3\u30d1\u30fc\u30af\u30e9\u30b9\u3082Javadoc\u3067\u78ba\u8a8d\u3057\u3066\u304a\u304f\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\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>String\u30af\u30e9\u30b9<\/h3>\n<p>\u30e9\u30c3\u30d1\u30fc\u30af\u30e9\u30b9\u306e\u6b21\u306b<span class=\"Text-highlight\">String<\/span>\u30af\u30e9\u30b9\u3092\u5b66\u7fd2\u3057\u307e\u3059\u3002<\/p>\n<h4 class=\"Heading Title Title--s\" id=\"Bookmark-5-1\"><span class=\"Num\">5.1.<\/span>String\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316<\/h4>\n<p>String\u30af\u30e9\u30b9\u306f\u3001\u6587\u5b57\u5217\u3092\u6271\u3046\u30af\u30e9\u30b9\u3067\u3001\u30e9\u30c3\u30d1\u30fc\u30af\u30e9\u30b9\u3068\u540c\u69d8\u306bjava.lang\u30d1\u30c3\u30b1\u30fc\u30b8\u306b\u5c5e\u3057\u307e\u3059\u3002<\/p>\n<p>String\u30af\u30e9\u30b9\u306f\u983b\u7e41\u306b\u5229\u7528\u3059\u308b\u305f\u3081\u3001\u4f8b\u5916\u7684\u306b\u8a31\u3055\u308c\u308b\u6587\u6cd5\u3084\u6c7a\u307e\u308a\u304c\u3044\u304f\u3064\u304b\u3042\u308a\u307e\u3059\u3002<br \/>\n\u3053\u308c\u307e\u3067\u306e\u5b66\u7fd2\u3067\u3001\u6587\u5b57\u5217\u306f\u300c&quot;&quot;\uff08\u30c0\u30d6\u30eb\u30af\u30a9\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\uff09\u300d\u3067\u56f2\u3093\u3067\u8868\u73fe\u3057\u3066\u3044\u307e\u3057\u305f\u304c\u3001\u3053\u308c\u3089\u306e\u6587\u5b57\u5217\u306f\u5168\u3066String\u30af\u30e9\u30b9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u3057\u3066\u6271\u308f\u308c\u3066\u3044\u307e\u3059\u3002<br \/>\n\u901a\u5e38\u3001\u30af\u30e9\u30b9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\u3092\u3057\u3066\u751f\u6210\u3057\u307e\u3059\u304c\u3001String\u30af\u30e9\u30b9\u306e\u5834\u5408\u3001\u6587\u5b57\u5217\u3092\u300c&quot;&quot;\uff08\u30c0\u30d6\u30eb\u30af\u30a9\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\uff09\u300d\u3067\u56f2\u3093\u3067\u4ee3\u5165\u3059\u308b\u3053\u3068\u3067\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u304c\u3001\u300c\u3042\u3044\u3046\u3048\u304a\u300d\u3068\u3044\u3046\u6587\u5b57\u5217\u3092\u5f15\u6570\u306b\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u4f7f\u7528\u3057\u3066\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u751f\u6210\u3059\u308b\u30b5\u30f3\u30d7\u30eb\u30bd\u30fc\u30b9\u3067\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>\/\/ \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\u306b\u3088\u308a\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u751f\u6210\r\nString str = new String(\"\u3042\u3044\u3046\u3048\u304a\");<\/code><\/pre>\n<p>\u3057\u304b\u3057\u3001String\u30af\u30e9\u30b9\u306e\u5834\u5408\u3001\u4e0a\u8a18\u306e\u3088\u3046\u306b\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\u3092\u660e\u793a\u3057\u306a\u304f\u3066\u3082\u3001\u3053\u308c\u307e\u3067\u306e\u30b5\u30f3\u30d7\u30eb\u30bd\u30fc\u30b9\u3067\u8a18\u8ff0\u3057\u3066\u304d\u305f\u3088\u3046\u306b\u3001\u6587\u5b57\u5217\u3092\u4ee3\u5165\u3059\u308b\u3053\u3068\u3067\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u751f\u6210\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>\/\/ \u6587\u5b57\u5217\"\u3042\u3044\u3046\u3048\u304a\"\u3092\u4ee3\u5165\u3059\u308b\u3053\u3068\u306b\u3088\u308a\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u751f\u6210\r\nString str = \"\u3042\u3044\u3046\u3048\u304a\";<\/code><\/pre>\n<p>\u3064\u307e\u308a\u3001String\u30af\u30e9\u30b9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u751f\u6210\u3059\u308b\u3068\u304d\u306b\u3001\u300cnew String()\u300d\u306e\u8a18\u8ff0\u304c\u7701\u7565\u3067\u304d\u308b\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002<\/p>\n<h4 class=\"Heading Title Title--s\" id=\"Bookmark-5-2\"><span class=\"Num\">5.2.<\/span>String\u30af\u30e9\u30b9\u306e\u30af\u30e9\u30b9\u30e1\u30bd\u30c3\u30c9<\/h4>\n<p>String\u30af\u30e9\u30b9\u306b\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30af\u30e9\u30b9\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308a\u307e\u3059\u3002\u4e3b\u306b\u4ed6\u306e\u578b\u304b\u3089String\u3078\u306e\u5909\u63db\u306b\u4f7f\u308f\u308c\u307e\u3059\u3002<br \/>\n\u4ee5\u4e0b\u304c\u30b5\u30f3\u30d7\u30eb\u30bd\u30fc\u30b9\u3067\u3059\u3002int\u578b\u3084long\u578b\u3001float\u578b\u3001double\u578b\u306e\u5024\u3092String\u578b\u306b\u5909\u63db\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<div class=\"Pre-title\">MyString1.java<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>\/\/ String\u30af\u30e9\u30b9\u306e\u30af\u30e9\u30b9\u30e1\u30bd\u30c3\u30c9\r\npublic class MyString1 {\r\n\tpublic static void main(String[] args) {\r\n\t\t\/\/ \u5404\u578b\u306e\u6587\u5b57\u5217\u8868\u73fe\u3092\u6301\u3064 String \u578b\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u751f\u6210\r\n\t\tint i = 100;\r\n\t\tSystem.out.println(String.valueOf(i)); \/\/ int\u578b\u3092String\u578b\u306b\u5909\u63db\r\n\t\tlong l = 2147483648L;\r\n\t\tSystem.out.println(String.valueOf(l)); \/\/ long\u578b\u3092String\u578b\u306b\u5909\u63db\r\n\t\tfloat f = 3.14F;\r\n\t\tSystem.out.println(String.valueOf(f)); \/\/ float\u578b\u3092String\u578b\u306b\u5909\u63db\r\n\t\tdouble d = 3.14;\r\n\t\tSystem.out.println(String.valueOf(d)); \/\/ double\u578b\u3092String\u578b\u306b\u5909\u63db\r\n\t}\r\n}<\/code><\/pre>\n<div class=\"Pre-title\">\u4e0a\u8a18\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5b9f\u884c\u3057\u305f\u5834\u5408\u306e\u51fa\u529b<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>100\r\n2147483648\r\n3.14\r\n3.14<\/code><\/pre>\n<p>String\u30af\u30e9\u30b9\u306b\u306f\u3001\u4ed6\u306b\u3082\u3044\u304f\u3064\u304b\u30af\u30e9\u30b9\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308a\u307e\u3059\u306e\u3067\u3001Javadoc\u3067\u78ba\u8a8d\u3057\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<h4 class=\"Heading Title Title--s\" id=\"Bookmark-5-3\"><span class=\"Num\">5.3.<\/span>String\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30e1\u30bd\u30c3\u30c9<\/h4>\n<p>String\u30af\u30e9\u30b9\u306b\u306f\u3001\u8272\u3005\u306a\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308a\u307e\u3059\u3002<br \/>\n\u6587\u5b57\u5217\u3092\u6bd4\u8f03\u3057\u305f\u308a\u3001\u6587\u5b57\u5217\u304b\u3089\u4e00\u90e8\u306e\u6587\u5b57\u5217\u3092\u629c\u304d\u51fa\u3057\u305f\u308a\u3001\u6587\u5b57\u5217\u3092\u5206\u5272\u3057\u305f\u308a\u306a\u3069\u3001\u69d8\u3005\u306a\u51e6\u7406\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u304c\u3088\u304f\u4f7f\u3046\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30e1\u30bd\u30c3\u30c9\u3067\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>\u8aac\u660e<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\n\t\t\t\tcharAt\n\t\t\t<\/td>\n<td>\n\t\t\t\t\u6307\u5b9a\u3057\u305f\u4f4d\u7f6e\u306b\u3042\u308b\u6587\u5b57\u3092\u53d6\u5f97\u3057\u307e\u3059\n\t\t\t<\/td>\n<\/tr>\n<tr>\n<td>\n\t\t\t\tcompareTo\n\t\t\t<\/td>\n<td>\n\t\t\t\t\u8f9e\u66f8\u306e\u8868\u793a\u9806\u3067\u6587\u5b57\u5217\u3092\u6bd4\u8f03\u3057\u307e\u3059\n\t\t\t<\/td>\n<\/tr>\n<tr>\n<td>\n\t\t\t\tequals\n\t\t\t<\/td>\n<td>\n\t\t\t\t\u6587\u5b57\u5217\u306e\u6bd4\u8f03\u3092\u3057\u307e\u3059\n\t\t\t<\/td>\n<\/tr>\n<tr>\n<td>\n\t\t\t\tindexOf\n\t\t\t<\/td>\n<td>\n\t\t\t\t\u6587\u5b57\u5217\u3092\u691c\u7d22\u3057\u3066\u6307\u5b9a\u3057\u305f\u6587\u5b57\u304c\u6700\u521d\u306b\u51fa\u73fe\u3059\u308b\u4f4d\u7f6e\u756a\u53f7\u3092\u53d6\u5f97\u3057\u307e\u3059\n\t\t\t<\/td>\n<\/tr>\n<tr>\n<td>\n\t\t\t\tlastIndexOf\n\t\t\t<\/td>\n<td>\n\t\t\t\t\u6587\u5b57\u5217\u3092\u691c\u7d22\u3057\u3066\u6307\u5b9a\u3057\u305f\u6587\u5b57\u304c\u6700\u5f8c\u306b\u51fa\u73fe\u3059\u308b\u4f4d\u7f6e\u756a\u53f7\u3092\u53d6\u5f97\u3057\u307e\u3059\n\t\t\t<\/td>\n<\/tr>\n<tr>\n<td>\n\t\t\t\tsplit\n\t\t\t<\/td>\n<td>\n\t\t\t\t\u533a\u5207\u308a\u6587\u5b57\u5217\u3092\u6307\u5b9a\u3057\u3066\u6587\u5b57\u5217\u3092\u5206\u5272\u3057\u307e\u3059\n\t\t\t<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u4ee5\u4e0b\u304c\u30b5\u30f3\u30d7\u30eb\u30bd\u30fc\u30b9\u3067\u3059\u3002\u300cABCDEF\u300d\u3068\u3044\u3046\u6587\u5b57\u5217\u3092\u6301\u3064String\u30af\u30e9\u30b9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8myS\u3092\u4f7f\u7528\u3057\u3066\u3001\u6587\u5b57\u306e\u629c\u304d\u51fa\u3057\u3068\u6bd4\u8f03\u3092\u884c\u3063\u3066\u3044\u307e\u3059\u3002<br \/>\n\u305d\u306e\u5f8c\u3001\u300cAABBCCDDEEFF\u300d\u3068\u3044\u3046\u6587\u5b57\u5217\u3092myS\u306b\u4ee3\u5165\u3057\u306a\u304a\u3057\u3066\u3001C\u3084CD\u306a\u3069\u304c\u73fe\u308c\u308b\u4f4d\u7f6e\u304cmyS\u306e\u6587\u5b57\u5217\u306e\u5de6\u304b\u3089\u6570\u3048\u3066\u4f55\u756a\u76ee\u304b\u3092indexOf\u30e1\u30bd\u30c3\u30c9\u3084lastIndexOf\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u8abf\u3079\u3066\u3044\u307e\u3059\u3002<br \/>\n\u306a\u304a\u3001\u6587\u5b57\u5217\u306f\u5de6\u304b\u3089\u6570\u3048\u3001\u4e00\u756a\u5de6\u306e\u6587\u5b57\u30920\u756a\u76ee\u3068\u3057\u3066\u30ab\u30a6\u30f3\u30c8\u3057\u307e\u3059\u3002<br \/>\n<span class=\"red yellow-background\"><span class=\"Text-highlight\">\u8a72\u5f53\u306e\u6587\u5b57\u5217\u304c\u898b\u3064\u304b\u3089\u306a\u3044\u5834\u5408\u306f\u3001-1\u3092\u8fd4\u3057\u307e\u3059\u3002<\/span><\/span><br \/>\n\u6700\u5f8c\u306b\u3001\u300c\u308a\u3093\u3054,\u3082\u3082,\u307f\u304b\u3093,\u306a\u3057,\u3059\u3044\u304b,\u3044\u3061\u3054\u300d\u3068\u3044\u3046\u6587\u5b57\u5217\u3092myS\u306b\u4ee3\u5165\u3057\u306a\u304a\u3057\u3066\u3001\u300c,\u300d\u533a\u5207\u308a\u3067\u6587\u5b57\u5217\u3092\u5206\u5272\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<div class=\"Pre-title\">MyString2.java<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>\/\/ String\u30af\u30e9\u30b9\u306e\u3088\u304f\u4f7f\u3046\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30e1\u30bd\u30c3\u30c9\r\npublic class MyString2 {\r\n\tpublic static void main(String[] args) {\r\n\t\t\/\/ String\u30af\u30e9\u30b9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8myS\u306b\u300cABCDEF\u300d\u3092\u4ee3\u5165\r\n\t\tString myS = \"ABCDEF\";\r\n\r\n\t\t\/\/ \uff11\uff0e2\u6587\u5b57\u76ee(B)\u3092\u53d6\u308a\u51fa\u3057\u307e\u3059\r\n\t\tSystem.out.println(\"\uff11\u306e\u7d50\u679c\uff1a\" + myS.charAt(1));\r\n\r\n\t\t\/\/ \uff12\uff0emyS\u3092 \"ABCDEG\" \u3068\u8f9e\u66f8\u5f0f(abc\u3084\u3042\u3044\u3046\u3048\u304a\u9806\uff09\u306b\u6bd4\u8f03\u3057\u3001\u6570\u5024\u3092\u8fd4\u3057\u307e\u3059\r\n\t\tSystem.out.println(\"\uff12\u306e\u7d50\u679c\uff1a\" + myS.compareTo(\"ABCDEG\"));\r\n\r\n\t\t\/\/ \uff13\uff0e\"ABCDEG\" \u3092myS\u3068\u8f9e\u66f8\u5f0f(abc\u3084\u3042\u3044\u3046\u3048\u304a\u9806\uff09\u306b\u6bd4\u8f03\u3057\u3001\u6570\u5024\u3092\u8fd4\u3057\u307e\u3059\r\n\t\tSystem.out.println(\"\uff13\u306e\u7d50\u679c\uff1a\" + \"ABCDEG\".compareTo(myS));\r\n\r\n\t\t\/\/ \uff14\uff0emyS\u3092 \"abcdef\" \u3068\u6bd4\u8f03\u3001boolean\u3067\u8fd4\u3057\u307e\u3059\r\n\t\tSystem.out.println(\"\uff14\u306e\u7d50\u679c\uff1a\" + myS.equals(\"abcdef\"));\r\n\t\tSystem.out.println(\"\uff14\u306e\u7d50\u679c\uff1a\" + !myS.equals(\"abcdef\"));\r\n\r\n\t\t\/\/ \u6539\u884c\r\n\t\tSystem.out.println(\"\");\r\n\r\n\t\t\/\/ myS\u306b\u300cAABBCCDDEEFF\u300d\u3092\u4ee3\u5165\r\n\t\tmyS = \"AABBCCDDEEFF\";\r\n\r\n\t\t\/\/ \uff15\uff0e\u6587\u982d\u304b\u3089\u8abf\u3079\u3066\u6700\u521d\u306b \"C\"\u304c\u73fe\u308c\u308b\u4f4d\u7f6e\u756a\u53f7\u3092\u8fd4\u3057\u307e\u3059\r\n\t\tSystem.out.println(\"\uff15\u306e\u7d50\u679c\uff1a\" + myS.indexOf(\"C\"));\r\n\r\n\t\t\/\/ \uff16\uff0e5\u756a\u76ee\u304b\u3089\u8abf\u3079\u3066\u6700\u521d\u306b \"C\"\u304c\u73fe\u308c\u308b\u4f4d\u7f6e\u756a\u53f7\u3092\u8fd4\u3057\u307e\u3059\r\n\t\tSystem.out.println(\"\uff16\u306e\u7d50\u679c\uff1a\" + myS.indexOf(\"C\", 5));\r\n\r\n\t\t\/\/ \uff17\uff0e\u6587\u982d\u304b\u3089\u8abf\u3079\u3066\u6700\u521d\u306b \"CD\"\u304c\u73fe\u308c\u308b\u4f4d\u7f6e\u756a\u53f7\u3092\u8fd4\u3057\u307e\u3059\r\n\t\tSystem.out.println(\"\uff17\u306e\u7d50\u679c\uff1a\" + myS.indexOf(\"CD\"));\r\n\r\n\t\t\/\/ \uff18\uff0e6\u756a\u76ee\u304b\u3089\u8abf\u3079\u3066\u6700\u521d\u306b\"CD\"\u304c\u73fe\u308c\u308b\u4f4d\u7f6e\u756a\u53f7\u3092\u8fd4\u3057\u307e\u3059\r\n\t\tSystem.out.println(\"\uff18\u306e\u7d50\u679c\uff1a\" + myS.indexOf(\"CD\", 6));\r\n\r\n\t\t\/\/ \uff19\uff0e\u6587\u672b\u304b\u3089\u8abf\u3079\u3066\u6700\u521d\u306b \"C\"\u304c\u73fe\u308c\u308b\u4f4d\u7f6e\u756a\u53f7\u3092\u8fd4\u3057\u307e\u3059\r\n\t\tSystem.out.println(\"\uff19\u306e\u7d50\u679c\uff1a\" + myS.lastIndexOf(\"C\"));\r\n\r\n\t\t\/\/ \uff11\uff10\uff0e4\u756a\u76ee\u304b\u3089\u6587\u982d\u306b\u5411\u304b\u3063\u3066\u8abf\u3079\u3066\u6700\u521d\u306b \"C\"\u304c\u73fe\u308c\u308b\u4f4d\u7f6e\u756a\u53f7\u3092\u8fd4\u3057\u307e\u3059\r\n\t\tSystem.out.println(\"\uff11\uff10\u306e\u7d50\u679c\uff1a\" + myS.lastIndexOf(\"C\", 4));\r\n\r\n\t\t\/\/ \uff11\uff11\uff0e\u6587\u672b\u304b\u3089\u8abf\u3079\u3066\u6700\u521d\u306b \"CD\"\u304c\u73fe\u308c\u308b\u4f4d\u7f6e\u756a\u53f7\u3092\u8fd4\u3057\u307e\u3059\r\n\t\tSystem.out.println(\"\uff11\uff11\u306e\u7d50\u679c\uff1a\" + myS.lastIndexOf(\"CD\"));\r\n\r\n\t\t\/\/ \uff11\uff12\uff0e6\u756a\u76ee\u304b\u3089\u6587\u982d\u306b\u5411\u304b\u3063\u3066\u8abf\u3079\u3066\u6700\u521d\u306b\"CD\"\u304c\u73fe\u308c\u308b\u4f4d\u7f6e\u756a\u53f7\u3092\u8fd4\u3057\u307e\u3059\r\n\t\tSystem.out.println(\"\uff11\uff12\u306e\u7d50\u679c\uff1a\" + myS.lastIndexOf(\"CD\", 6));\r\n\r\n\t\t\/\/ \u6539\u884c\r\n\t\tSystem.out.println(\"\");\r\n\r\n\t\t\/\/ myS\u306b\u300c\u308a\u3093\u3054,\u3082\u3082,\u307f\u304b\u3093,\u306a\u3057,\u3059\u3044\u304b,\u3044\u3061\u3054\u300d\u3092\u4ee3\u5165\r\n\t\tmyS = \"\u308a\u3093\u3054,\u3082\u3082,\u307f\u304b\u3093,\u306a\u3057,\u3059\u3044\u304b,\u3044\u3061\u3054\";\r\n\r\n\t\t\/\/ \uff11\uff13\uff0emyS\u306e\u6587\u5b57\u5217\u3092\u300c,\u300d\u3092\u533a\u5207\u308a\u6587\u5b57\u3068\u3057\u3066\u5206\u5272\r\n\t\tString[] splMyS = myS.split(\",\");\r\n\r\n\t\tSystem.out.println(\"\uff11\uff13\u306e\u7d50\u679c\uff1a\");\r\n\r\n\t\tfor (String str : splMyS) {\r\n\t\t\t\tSystem.out.println(str);\r\n\t\t}\r\n\t}\r\n}<\/code><\/pre>\n<div class=\"Pre-title\">\u4e0a\u8a18\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5b9f\u884c\u3057\u305f\u5834\u5408\u306e\u51fa\u529b<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>\uff11\u306e\u7d50\u679c\uff1aB\r\n\uff12\u306e\u7d50\u679c\uff1a-1\r\n\uff13\u306e\u7d50\u679c\uff1a1\r\n\uff14\u306e\u7d50\u679c\uff1afalse\r\n\uff14\u306e\u7d50\u679c\uff1atrue\r\n\r\n\uff15\u306e\u7d50\u679c\uff1a4\r\n\uff16\u306e\u7d50\u679c\uff1a5\r\n\uff17\u306e\u7d50\u679c\uff1a5\r\n\uff18\u306e\u7d50\u679c\uff1a-1\r\n\uff19\u306e\u7d50\u679c\uff1a5\r\n\uff11\uff10\u306e\u7d50\u679c\uff1a4\r\n\uff11\uff11\u306e\u7d50\u679c\uff1a5\r\n\uff11\uff12\u306e\u7d50\u679c\uff1a5\r\n\r\n\uff11\uff13\u306e\u7d50\u679c\uff1a\r\n\u308a\u3093\u3054\r\n\u3082\u3082\r\n\u307f\u304b\u3093\r\n\u306a\u3057\r\n\u3059\u3044\u304b\r\n\u3044\u3061\u3054<\/code><\/pre>\n<h5 class=\"Heading Title Title--xs\" id=\"Bookmark-5-3-1\"><span class=\"Num\">5.3.1.<\/span>equals\u30e1\u30bd\u30c3\u30c9<\/h5>\n<p>\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u51e6\u7406\u306e\u4e2d\u3067\u3001\u6587\u5b57\u5217\u306e\u6bd4\u8f03\u306f\u3088\u304f\u884c\u3046\u51e6\u7406\u306e\u4e00\u3064\u3067\u3059\u3002<br \/>\n\u6587\u5b57\u5217\u306e\u6bd4\u8f03\u306b\u306f\u3001String\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30e1\u30bd\u30c3\u30c9\u306eequals\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<p>\u307e\u305a\u306f\u3001\u4ee5\u4e0b\u306e\u30b5\u30f3\u30d7\u30eb\u30bd\u30fc\u30b9\u3092\u78ba\u8a8d\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<br \/>\n2\u3064\u306e\u300c\u3042\u3044\u3046\u3048\u304a\u300d\u3068\u3044\u3046\u6587\u5b57\u5217\u3092\u6bd4\u8f03\u3057\u3066\u3044\u307e\u3059\u3002<br \/>\n\u5f53\u7136\u540c\u3058\u5024\u3092\u6bd4\u8f03\u3057\u3066\u3044\u308b\u306e\u3067\u3001\u6bd4\u8f03\u7d50\u679c\u306f\u3001true\u3068\u306a\u308a\u3001if\u6587\u306e\u51e6\u7406\u304c\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>if (\"\u3042\u3044\u3046\u3048\u304a\" == \"\u3042\u3044\u3046\u3048\u304a\") {\r\n\t\/\/ \u6bd4\u8f03\u7d50\u679c\u304ctrue\u306e\u305f\u3081\u5b9f\u884c\u3055\u308c\u307e\u3059\r\n}<\/code><\/pre>\n<p>\u4e00\u898b\u5f53\u305f\u308a\u524d\u306e\u3088\u3046\u3067\u3059\u304c\u3001\u4e0a\u8a18\u306e\u6bd4\u8f03\u306f\u3001\u57fa\u672c\u30c7\u30fc\u30bf\u578b\u306e\u6bd4\u8f03\u306e\u3088\u3046\u306b\u30c7\u30fc\u30bf\uff08\u5024\uff09\u305d\u306e\u3082\u306e\u3092\u6bd4\u8f03\u3057\u3066\u3044\u308b\u308f\u3051\u3067\u306a\u304f\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u53c2\u7167\u5143\u3092\u6bd4\u8f03\u3057\u3066\u3044\u307e\u3059\u3002<br \/>\n\u9055\u3044\u3092\u7406\u89e3\u3059\u308b\u305f\u3081\u3001\u4ee5\u4e0b\u306e\u30b5\u30f3\u30d7\u30eb\u30bd\u30fc\u30b9\u3067\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002<br \/>\n2\u3064\u306eString\u30af\u30e9\u30b9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8a\u3068b\u306f\u3001\u540c\u3058\u5024&quot;\u3042\u3044\u3046\u3048\u304a&quot;\u3092\u6301\u3063\u3066\u3044\u307e\u3059\u304c\u3001\u5225\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3042\u308b\u305f\u3081\u3001\u53c2\u7167\u5143\u304c\u7570\u306a\u308a\u307e\u3059\u3002<br \/>\n\u305d\u306e\u305f\u3081\u3001if\u6587\u306e\u6bd4\u8f03\u7d50\u679c\u306f\u3001false\u3068\u306a\u308a\u3001if\u6587\u306e\u51e6\u7406\u306f\u3001\u5b9f\u884c\u3055\u308c\u307e\u305b\u3093\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>String a = new String(\"\u3042\u3044\u3046\u3048\u304a\");\r\nString b = new String(\"\u3042\u3044\u3046\u3048\u304a\");\r\nif (a == b) {\r\n\t\/\/ \u6bd4\u8f03\u7d50\u679c\u304cfalse\u306e\u305f\u3081\u5b9f\u884c\u3055\u308c\u307e\u305b\u3093\r\n}<\/code><\/pre>\n<p>\u3053\u306e\u3088\u3046\u306b\u3001\u6587\u5b57\u5217\u540c\u58eb\u3092\u6bd4\u8f03\u3059\u308b\u5834\u5408\u306b\u300c==\u300d\u6f14\u7b97\u5b50\u3092\u5229\u7528\u3059\u308b\u3068\u3001\u601d\u308f\u306c\u7d50\u679c\u304c\u8fd4\u3063\u3066\u304f\u308b\u3053\u3068\u304c\u3042\u308b\u305f\u3081\u3001\u57fa\u672c\u7684\u306b\u5229\u7528\u3057\u307e\u305b\u3093\u3002<br \/>\n\u305d\u306e\u305f\u3081\u3001\u6587\u5b57\u5217\u306e\u6bd4\u8f03\u306b\u306fString\u30af\u30e9\u30b9\u306eequals\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3044\u307e\u3059\u3002<br \/>\nequals\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u53c2\u7167\u5143\u3067\u306f\u306a\u304f\u3001\u30c7\u30fc\u30bf\uff08\u5024\uff09\u3092\u6bd4\u8f03\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>String a = new String(\"\u3042\u3044\u3046\u3048\u304a\");\r\nString b = new String(\"\u3042\u3044\u3046\u3048\u304a\");\r\n\/\/ true\r\nif (a.equals(b)) {\r\n\t\/\/ \u6bd4\u8f03\u7d50\u679c\u304ctrue\u306e\u305f\u3081\u5b9f\u884c\u3055\u308c\u307e\u3059\r\n}<\/code><\/pre>\n<p>\u307e\u305f\u3001\u300c!\u300d\uff08\u30a8\u30af\u30b9\u30af\u30e9\u30e1\u30fc\u30b7\u30e7\u30f3\u30de\u30fc\u30af\uff09\u3092\u3064\u3051\u308b\u3053\u3068\u3067\u3001\u6bd4\u8f03\u7d50\u679c\u3092\u9006\u306b\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>String a = new String(\"\u3042\u3044\u3046\u3048\u304a\");\r\nString b = new String(\"\u3042\u3044\u3046\u3048\u304a\");\r\nif (!a.equals(b)) {\r\n\t\/\/ \u6bd4\u8f03\u7d50\u679c\u304cfalse\u306e\u305f\u3081\u5b9f\u884c\u3055\u308c\u307e\u305b\u3093\r\n}<\/code><\/pre>\n<p>String\u30af\u30e9\u30b9\u306eequals\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u3088\u304f\u4f7f\u3044\u307e\u3059\u306e\u3067\u3001\u5fd8\u308c\u306a\u3044\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<br \/>\n\u307e\u305f\u3001\u300c!\u300d\uff08\u30a8\u30af\u30b9\u30af\u30e9\u30e1\u30fc\u30b7\u30e7\u30f3\u30de\u30fc\u30af\uff09\u306fequals\u30e1\u30bd\u30c3\u30c9\u3060\u3051\u3067\u306a\u304f\u3001<br \/>\n\u4ed6\u306e\u6bd4\u8f03\u7d50\u679c\uff08\u3064\u307e\u308aboolean\u578b\uff09\u3092\u8fd4\u5374\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u306b\u3082\u5229\u7528\u3067\u304d\u307e\u3059\u306e\u3067\u3001\u3053\u3061\u3089\u3082\u899a\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<h5 class=\"Heading Title Title--xs\" id=\"Bookmark-5-3-2\"><span class=\"Num\">5.3.2.<\/span>split\u30e1\u30bd\u30c3\u30c9<\/h5>\n<p>split\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3046\u3068\u3001\u6587\u5b57\u5217\u3092\u7279\u5b9a\u306e\u533a\u5207\u308a\u6587\u5b57\u3067\u5206\u5272\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br \/>\n\u4f8b\u3048\u3070\u3001\u300c,\uff08\u30ab\u30f3\u30de\uff09\u300d\u3067\u3044\u304f\u3064\u304b\u306e\u8981\u7d20\u306b\u533a\u5207\u3089\u308c\u305f\u6587\u5b57\u5217\u3092\u8aad\u307f\u8fbc\u3093\u3067\u3001\u300c,\u300d\u3092\u76ee\u5b89\u306b\u8981\u7d20\u3054\u3068\u306b\u3092\u6587\u5b57\u5217\u3092\u5206\u5272\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br \/>\n\u5206\u5272\u3057\u305f\u5024\u306f\u3001String\u578b\u306e\u914d\u5217\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u66f8\u5f0f\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>String[] strs = \u5206\u5272\u5bfe\u8c61\u6587\u5b57\u5217.split(\u533a\u5207\u308a\u6587\u5b57\u5217);<\/code><\/pre>\n<p>\u533a\u5207\u308a\u6587\u5b57\u5217\u90e8\u5206\u306b\u306f\u3001\u300c,\u300d\u3084\u300cA\u300d\u306a\u3069\u306e\u4e00\u3064\u306e\u6587\u5b57\u3060\u3051\u3067\u306a\u304f\u3001\u300cABC\u300d\u306a\u3069\u306e\u6587\u5b57\u5217\u3082\u6307\u5b9a\u3067\u304d\u307e\u3059\u3002<br \/>\n\u533a\u5207\u308a\u6587\u5b57\u5217\u306b\u6307\u5b9a\u3059\u308b\u5f15\u6570\u306f\u3001\u6b63\u78ba\u306b\u306f\u300c\u6b63\u898f\u8868\u73fe\u300d\u3092\u6307\u5b9a\u3059\u308b\u306e\u3067\u3059\u304c\u3001\u5c11\u3057\u96e3\u6613\u5ea6\u304c\u9ad8\u3044\u306e\u3067\u3001\u8a73\u3057\u3044\u8aac\u660e\u306f\u5272\u611b\u3057\u307e\u3059\u3002<br \/>\n\u3072\u3068\u307e\u305a\u306f\u3001\u533a\u5207\u308a\u305f\u3044\u6587\u5b57\u3092\u6307\u5b9a\u3059\u308b\u3068\u6587\u5b57\u304c\u5206\u5272\u3055\u308c\u3001String\u578b\u306e\u914d\u5217\u3067\u623b\u3063\u3066\u304f\u308b\u3068\u3060\u3051\u899a\u3048\u3066\u304a\u3051\u3070\u826f\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n<p>\u306a\u304a\u3001\u53e4\u3044\u30d0\u30fc\u30b8\u30e7\u30f3\u306eJDK\u3092\u4f7f\u3046\u5834\u5408\u3001split\u30e1\u30bd\u30c3\u30c9\u306f\u4f7f\u3048\u306a\u3044\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<br \/>\n\u4f7f\u3048\u306a\u3044\u5834\u5408\u306f\u3001\u300cStringTokenizer\u300d\u3068\u3044\u3046\u30af\u30e9\u30b9\u3067\u540c\u3058\u3088\u3046\u306a\u64cd\u4f5c\u304c\u884c\u3048\u308b\u305f\u3081\u3001Javadoc\u3067\u8abf\u3079\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h5 class=\"Heading Title Title--xs\" id=\"Bookmark-5-3-3\"><span class=\"Num\">5.3.3.<\/span>\u305d\u306e\u4ed6\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30e1\u30bd\u30c3\u30c9<\/h5>\n<p>\u305d\u306e\u4ed6\u306e\u3088\u304f\u4f7f\u3046\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30e1\u30bd\u30c3\u30c9\u3092\u7d39\u4ecb\u3057\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>\u8aac\u660e<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\n\t\t\t\tlength\n\t\t\t<\/td>\n<td>\n\t\t\t\t\u6587\u5b57\u5217\u306e\u9577\u3055\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306b\u4f7f\u3044\u307e\u3059\n\t\t\t<\/td>\n<\/tr>\n<tr>\n<td>\n\t\t\t\treplace\n\t\t\t<\/td>\n<td>\n\t\t\t\t\u6587\u5b57\u3092\u7f6e\u63db\u3057\u307e\u3059\n\t\t\t<\/td>\n<\/tr>\n<tr>\n<td>\n\t\t\t\tstartsWith\n\t\t\t<\/td>\n<td>\n\t\t\t\t\u5f15\u6570\u3067\u6e21\u3057\u305f\u6587\u5b57\u3067\u59cb\u307e\u308b\u304b\u3092boolean\u3067\u8fd4\u3057\u307e\u3059\n\t\t\t<\/td>\n<\/tr>\n<tr>\n<td>\n\t\t\t\tsubstring\n\t\t\t<\/td>\n<td>\n\t\t\t\t\u90e8\u5206\u6587\u5b57\u5217\u3092\u62bd\u51fa\u3057\u307e\u3059\n\t\t\t<\/td>\n<\/tr>\n<tr>\n<td>\n\t\t\t\ttrim\n\t\t\t<\/td>\n<td>\n\t\t\t\t\u524d\u5f8c\u306e\u7a7a\u767d\u6587\u5b57\u3092\u524a\u9664\u3057\u307e\u3059\n\t\t\t<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u4ee5\u4e0b\u304c\u30b5\u30f3\u30d7\u30eb\u30bd\u30fc\u30b9\u3067\u3059\u3002<\/p>\n<div class=\"Pre-title\">MyString3.java<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>\/\/ String\u30af\u30e9\u30b9\u306e\u305d\u306e\u4ed6\u306e\u3088\u304f\u4f7f\u3046\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30e1\u30bd\u30c3\u30c9\r\npublic class MyString3 {\r\n\tpublic static void main(String[] args) {\r\n\t\tString myS = new String(\"ABCDEF\");\r\n\r\n\t\t\/\/ \uff11\uff0e\u6587\u5b57\u5217\u306e\u9577\u3055\u3092\u53d6\u5f97\u3057\u307e\u3059\r\n\t\tSystem.out.println(\"\uff11\u306e\u7d50\u679c\uff1a\" + myS.length());\r\n\r\n\t\t\/\/ \uff12\uff0eB\u3092b\u3067\u7f6e\u304d\u63db\u3048\u307e\u3059\r\n\t\tSystem.out.println(\"\uff12\u306e\u7d50\u679c\uff1a\" + myS.replace(\"B\", \"b\"));\r\n\r\n\t\t\/\/ \uff13\uff0eAB\u3067\u59cb\u307e\u308b\u304b\u3069\u3046\u304b\u3092boolean\u3067\u8fd4\u3057\u307e\u3059\r\n\t\tSystem.out.println(\"\uff13\u306e\u7d50\u679c\uff1a\" + myS.startsWith(\"AB\"));\r\n\r\n\t\t\/\/ \uff14\uff0e2\u756a\u76ee\u3092\u57fa\u70b9\u306bBC\u3067\u59cb\u307e\u308b\u304b\u3069\u3046\u304b\u3092boolean\u3067\u8fd4\u3057\u307e\u3059\r\n\t\tSystem.out.println(\"\uff14\u306e\u7d50\u679c\uff1a\" + myS.startsWith(\"BC\", 1));\r\n\r\n\t\t\/\/ \uff15\uff0e3\u756a\u76ee\u304b\u3089\u6700\u5f8c\u307e\u3067\u306e\u6587\u5b57\u5217\u3092\u5207\u308a\u51fa\u3057\u307e\u3059\r\n\t\tSystem.out.println(\"\uff15\u306e\u7d50\u679c\uff1a\" + myS.substring(2));\r\n\r\n\t\t\/\/ \uff16\uff0e3\u756a\u76ee\u30684\u756a\u76ee\u306e\u6587\u5b57\u5217\u3092\u5207\u308a\u51fa\u3057\u307e\u3059\r\n\t\tSystem.out.println(\"\uff16\u306e\u7d50\u679c\uff1a\" + myS.substring(2, 4));\r\n\r\n\t\tmyS = new String(\" ABC DEF \");\r\n\t\t\/\/ \uff17\uff0e\u6587\u5b57\u5217\u306e\u4e21\u7aef\u304b\u3089\u30b9\u30da\u30fc\u30b9\u3092\u524a\u9664\u3057\u307e\u3059\r\n\t\tSystem.out.println(\"\uff17\u306e\u7d50\u679c\uff1a\" + myS.trim());\r\n\t}\r\n}<\/code><\/pre>\n<div class=\"Pre-title\">\u4e0a\u8a18\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5b9f\u884c\u3057\u305f\u5834\u5408\u306e\u51fa\u529b<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>\uff11\u306e\u7d50\u679c\uff1a6\r\n\uff12\u306e\u7d50\u679c\uff1aAbCDEF\r\n\uff13\u306e\u7d50\u679c\uff1atrue\r\n\uff14\u306e\u7d50\u679c\uff1atrue\r\n\uff15\u306e\u7d50\u679c\uff1aCDEF\r\n\uff16\u306e\u7d50\u679c\uff1aCD\r\n\uff17\u306e\u7d50\u679c\uff1aABC DEF<\/code><\/pre>\n<p>String\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u65b9\u306f\u3001\u7406\u89e3\u3067\u304d\u305f\u3067\u3057\u3087\u3046\u304b\u3002<br \/>\n\u4e00\u5ea6\u306b\u899a\u3048\u308b\u306e\u306f\u5927\u5909\u3067\u3059\u306e\u3067\u3001\u5c11\u3057\u305a\u3064\u4f7f\u3044\u306a\u304c\u3089\u899a\u3048\u3066\u3044\u304f\u3068\u826f\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n<h4 class=\"Heading Title Title--s\" id=\"Bookmark-5-4\"><span class=\"Num\">5.4.<\/span>String\u30af\u30e9\u30b9\u306e\u52a0\u7b97\u6f14\u7b97\u5b50<\/h4>\n<p>\u6700\u5f8c\u306bString\u30af\u30e9\u30b9\u306e\u52a0\u7b97\u6f14\u7b97\u5b50\u306b\u3064\u3044\u3066\u3001\u8aac\u660e\u3057\u307e\u3059\u3002<br \/>\nString\u30af\u30e9\u30b9\uff08\u6587\u5b57\u5217\uff09\u306b\u5bfe\u3057\u3066\u3001\u52a0\u7b97\u6f14\u7b97\u5b50\u300c&#43;\uff08\u30d7\u30e9\u30b9\uff09\u300d\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u6587\u5b57\u5217\u306e\u9023\u7d50\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u304c\u30b5\u30f3\u30d7\u30eb\u30bd\u30fc\u30b9\u3067\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>String str = \"\u3042\u3055\" + \"\u304b\u3089\";\r\nSystem.out.println(str);\r\nstr += \"\u3052\u3093\u304d\u3067\u3059\";\r\nSystem.out.println(str);<\/code><\/pre>\n<p>\u307e\u305f\u3001\u4ed6\u306e\u578b\u3068\u6587\u5b57\u5217\u3092\u52a0\u7b97\u6f14\u7b97\u5b50\u3067\u3064\u306a\u3052\u308b\u3068\u3001\u7d50\u679c\u3092String\u578b\u306b\u3059\u308b\u6027\u8cea\u304c\u3042\u308a\u307e\u3059\u3002<br \/>\n\u4ee5\u4e0b\u304c\u30b5\u30f3\u30d7\u30eb\u30bd\u30fc\u30b9\u3067\u3059\u3002<br \/>\n\u7a7a\u6587\u5b57\u306e\u300c&quot;&quot;\u300d\u3068int\u578b\u306e\u6570\u5024\u3092\u52a0\u7b97\u3059\u308b\u3068\u3001\u6587\u5b57\u5217\u306e\u9023\u7d50\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>\/\/ 1\u306f\u3001\u6587\u5b57\u5217\u3068\u306a\u308a\u307e\u3059\r\nSystem.out.println(\"\" + 1);\r\n\r\n\/\/ 34\u30681\u304c\u6587\u5b57\u5217\u3068\u306a\u308a\u3001\u6587\u5b57\u5217\u306e\u9023\u7d50\u3067341\u3068\u8868\u793a\u3055\u308c\u307e\u3059\r\nSystem.out.println(34 + \"\" + 1);<\/code><\/pre>\n<p>\u9069\u5207\u306b\u5229\u7528\u3059\u308c\u3070\u975e\u5e38\u306b\u6709\u52b9\u306a\u6a5f\u80fd\u3067\u3059\u304c\u3001\u7406\u89e3\u304c\u6d45\u3044\u3068\u30d7\u30ed\u30b0\u30e9\u30e0\u30d0\u30b0\uff08\u30a8\u30e9\u30fc\uff09\u306e\u539f\u56e0\u306b\u306a\u308a\u307e\u3059\u306e\u3067\u3001\u6ce8\u610f\u3057\u3066\u4f7f\u3044\u307e\u3057\u3087\u3046\u3002<\/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>LocalDateTime\u30af\u30e9\u30b9<\/h3>\n<p>Java\u306b\u306f\u3001\u65e5\u6642\u3092\u6271\u3046\u30af\u30e9\u30b9\u3068\u3057\u3066\u3001LocalDateTime\u30af\u30e9\u30b9\u3084ZonedDateTime\u30af\u30e9\u30b9\u3001OffsetDateTime\u30af\u30e9\u30b9\u306a\u3069\u304c\u3042\u308a\u307e\u3059\u3002<br \/>\n\u307e\u305f\u3001\u30d5\u30a9\u30fc\u30de\u30c3\u30bf\u30fc\u3068\u3057\u3066DateTimeFormatter\u30af\u30e9\u30b9\u304c\u3042\u308a\u307e\u3059\u3002<br \/>\n\u3053\u3053\u3067\u306f\u3001LocalDateTime\u30af\u30e9\u30b9\u3068DateTimeFormatter\u30af\u30e9\u30b9\u306e\u4f7f\u3044\u65b9\u3092\u5b66\u7fd2\u3057\u307e\u3059\u3002<\/p>\n<p>LocalDateTime\u30af\u30e9\u30b9\u306f\u3001\u5e74\u3001\u6708\u3001\u65e5\u3001\u6642\u3001\u5206\u3001\u79d2\uff08\u30ca\u30ce\u79d2\uff09\u3001\u66dc\u65e5\u3092\u6271\u3044\u306a\u304c\u3089\u3001\u73fe\u5728\u65e5\u6642\u3084\u66dc\u65e5\u306e\u4ed6\u3001\u6307\u5b9a\u3057\u305f\u65e5\u306e\u66dc\u65e5\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u306a\u3069\u304c\u3067\u304d\u307e\u3059\u3002<br \/>\n\u3053\u306eLocalDateTime\u30af\u30e9\u30b9\u306fjava.time\u30d1\u30c3\u30b1\u30fc\u30b8\u306b\u5c5e\u3057\u307e\u3059\u3002<br \/>\n\u30d1\u30c3\u30b1\u30fc\u30b8\u306b\u5c5e\u3057\u3066\u3044\u308b\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3059\u308b\u3068\u304d\u306b\u306f\u3001\u30a4\u30f3\u30dd\u30fc\u30c8\u3068\u547c\u3070\u308c\u308b\u51e6\u7406\u3092\u884c\u3046\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<br \/>\n\u305d\u306e\u305f\u3081\u3001LocalDateTime\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3059\u308b\u306b\u306f\u3001\u4ee5\u4e0b\u306e\u30a4\u30f3\u30dd\u30fc\u30c8\u6587\u3092\u30af\u30e9\u30b9\u306e\u5ba3\u8a00\u90e8\u306e\u4e0a\u306b\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>import java.time.LocalDateTime;<\/code><\/pre>\n<p>LocalDateTime\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3059\u308b\u3068\u304d\u306f\u3001LocalDateTime\u30af\u30e9\u30b9\u306e\u30af\u30e9\u30b9\u30e1\u30bd\u30c3\u30c9\u3067\u3042\u308b\u300cnow\u30e1\u30bd\u30c3\u30c9\uff08\u73fe\u5728\u65e5\u6642\uff09\u300d\u304b\u300cof\u30e1\u30bd\u30c3\u30c9\uff08\u65e5\u6642\u3092\u6307\u5b9a\uff09\u300d\u3067\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<br \/>\n\u300cnew\u300d\u3092\u7528\u3044\u305f\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\u306f\u3067\u304d\u307e\u305b\u3093\u306e\u3067\u3001\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p>\u4ee5\u4e0b\u304c\u30b5\u30f3\u30d7\u30eb\u30bd\u30fc\u30b9\u3067\u3059\u3002\u73fe\u5728\u65e5\u6642\u3001\u66dc\u65e5\u3001\u6642\u9593\u3068\u5206\u3001\u79d2\u3092\u53d6\u5f97\u3057\u3066\u3001\u30b3\u30f3\u30bd\u30fc\u30eb\u306b\u8868\u793a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<div class=\"Pre-title\">MyLocalDateTime1.java<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>\/\/ LocalDateTime\u30af\u30e9\u30b9\u3067\u73fe\u5728\u65e5\u6642\u3001\u66dc\u65e5\u3001\u6642\u9593\u3001\u5206\u3001\u79d2\u3092\u53d6\u5f97\r\nimport java.time.LocalDateTime;\r\nimport java.time.format.TextStyle;\r\nimport java.util.Locale;\r\n\r\npublic class MyLocalDateTime1 {\r\n\tpublic static void main(String[] args) {\r\n\t\t\/\/ LocalDateTime\u30af\u30e9\u30b9\u3092\u73fe\u5728\u65e5\u6642\u3067\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\r\n\t\tLocalDateTime ldt = LocalDateTime.now();\r\n\r\n\t\tint year = ldt.getYear(); \/\/ \u73fe\u5728\u5e74\u3092\u53d6\u5f97\r\n\t\tint month = ldt.getMonthValue(); \/\/ \u73fe\u5728\u6708\u3092\u53d6\u5f97\r\n\t\tint day = ldt.getDayOfMonth(); \/\/ \u73fe\u5728\u65e5\u3092\u53d6\u5f97\r\n\r\n\t\t\/\/ \u73fe\u5728\u5e74\u6708\u65e5\u3092\u8868\u793a\r\n\t\tSystem.out.println(year + \"\u5e74\" + month + \"\u6708\" + day + \"\u65e5\");\r\n\r\n\t\t\/\/ \u73fe\u5728\u66dc\u65e5\u3092\u53d6\u5f97\r\n\t\tString week = ldt.getDayOfWeek().getDisplayName(TextStyle.FULL, Locale.JAPAN);\r\n\r\n\t\t\/\/ \u73fe\u5728\u66dc\u65e5\u3092\u8868\u793a\r\n\t\tSystem.out.println(week);\r\n\r\n\t\tint hour = ldt.getHour(); \/\/ \u73fe\u5728\u6642\u9593\u3092\u53d6\u5f97\r\n\t\tint min = ldt.getMinute(); \/\/ \u73fe\u5728\u5206\u3092\u53d6\u5f97\r\n\t\tint sec = ldt.getSecond(); \/\/ \u73fe\u5728\u79d2\u3092\u53d6\u5f97\r\n\r\n\t\t\/\/ \u73fe\u5728\u6642\u9593\u3001\u5206\u3001\u79d2\u3092\u8868\u793a\r\n\t\tSystem.out.println(hour + \"\u6642\" + min + \"\u5206\" + sec + \"\u79d2\");\r\n\t}\r\n}<\/code><\/pre>\n<div class=\"Pre-title\">\u4e0a\u8a18\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5b9f\u884c\u3057\u305f\u5834\u5408\u306e\u51fa\u529b\uff08\u7d50\u679c\u306f\u5b9f\u884c\u6642\u306e\u72b6\u6cc1\u306b\u3088\u308a\u5909\u52d5\u3057\u307e\u3059\uff09<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>2018\u5e7412\u67087\u65e5\r\n\u91d1\u66dc\u65e5\r\n20\u66422\u52069\u79d2<\/code><\/pre>\n<p>\u73fe\u5728\u66dc\u65e5\u3092\u53d6\u5f97\u3059\u308b\u6642\u306b\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>\/\/ \u73fe\u5728\u66dc\u65e5\u3092\u53d6\u5f97\r\nString week = ldt.getDayOfWeek().getDisplayName(TextStyle.FULL, Locale.JAPAN);<\/code><\/pre>\n<p>getDisplayName\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u306b\u306f\u3001\u7b2c\u4e00\u5f15\u6570\u306b\u8868\u793a\u3059\u308b\u30c6\u30ad\u30b9\u30c8\u306e\u30b5\u30a4\u30ba\u3001\u7b2c\u4e8c\u5f15\u6570\u306b\u5730\u57df\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u3002<br \/>\n\u4e0a\u8a18\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u306f\u3001<span class=\"Text-highlight\">TextStyle.FULL<\/span>\u3067\u30d5\u30eb\u30c6\u30ad\u30b9\u30c8\u3092\u6307\u5b9a\u3057\u3001<span\n\tclass=\"Text-highlight\">Locale.JAPAN<\/span>\u3067\u5730\u57df\u306b\u65e5\u672c\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u300e\u25cf\u66dc\u65e5\u300f\u3068\u8868\u793a\u3055\u305b\u3066\u3044\u307e\u3059\u3002<br \/>\n\u306a\u304a\u3001TextStyle\u306b\u306f\u5225\u306e\u30c6\u30ad\u30b9\u30c8\u30b5\u30a4\u30ba\u304c\u3001Locale\u306b\u306f\u5225\u306e\u5730\u57df\u306e\u8a2d\u5b9a\u304c\u53ef\u80fd\u3067\u3059\u306e\u3067\u3001\u5fc5\u8981\u306b\u5fdc\u3058\u3066API\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u78ba\u8a8d\u3057\u3001\u5229\u7528\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u307e\u305f\u3001DateTimeFormatter\u30af\u30e9\u30b9\u3092\u7528\u3044\u308c\u3070\u3001\u3088\u308a\u7c21\u6f54\u306b\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br \/>\n\u4ee5\u4e0b\u306e\u30b5\u30f3\u30d7\u30eb\u30bd\u30fc\u30b9\u3067\u306f\u3001\u65e5\u6642\u3092\u6307\u5b9a\u3057\u305f\u5f8c\u306b\u5404\u60c5\u5831\u3092\u8868\u793a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<div class=\"Pre-title\">MyLocalDateTime2.java<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>import java.time.LocalDateTime;\r\nimport java.time.format.DateTimeFormatter;\r\nimport java.util.Locale;\r\n\r\npublic class MyLocalDateTime2 {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\t\/\/ LocalDateTime\u30af\u30e9\u30b9\u30922018\u5e7412\u670818\u65e5 15\u664227\u520654\u79d2\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\r\n\t\tLocalDateTime ldt = LocalDateTime.of(2018, 12, 18, 15, 27, 54);\r\n\r\n\t\t\/\/ \u5e74\u6708\u65e5\u3092\u8868\u793a\r\n\t\tDateTimeFormatter dtfDate = DateTimeFormatter.ofPattern(\"uuuu\u5e74MM\u6708dd\u65e5\");\r\n\t\tSystem.out.println(dtfDate.format(ldt));\r\n\r\n\t\t\/\/ \u66dc\u65e5\u3092\u8868\u793a\r\n\t\tDateTimeFormatter dtfWeek = DateTimeFormatter.ofPattern(\"EEEE\", Locale.JAPAN);\r\n\t\tSystem.out.println(dtfWeek.format(ldt));\r\n\r\n\t\t\/\/ \u6642\u9593\u3001\u5206\u3001\u79d2\u3092\u8868\u793a\r\n\t\tDateTimeFormatter dtfTime = DateTimeFormatter.ofPattern(\"HH\u6642mm\u5206ss\u79d2\");\r\n\t\tSystem.out.println(dtfTime.format(ldt));\r\n\t}\r\n}<\/code><\/pre>\n<p>DateTimeFormatter\u30af\u30e9\u30b9\u3084Locale\u30af\u30e9\u30b9\u3082\u30a4\u30f3\u30dd\u30fc\u30c8\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u305f\u3081\u3001\u30af\u30e9\u30b9\u306e\u5ba3\u8a00\u90e8\u306e\u4e0a\u306b\u30a4\u30f3\u30dd\u30fc\u30c8\u6587\u3092\u8a18\u8ff0\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u307e\u305f\u3001\u66dc\u65e5\u3092\u8868\u793a\u3059\u308b\u305f\u3081\u306b\u3001<span\n\tclass=\"Text-highlight\">DateTimeFormatter.ofPattern<\/span>\u30e1\u30bd\u30c3\u30c9\u306b\u6307\u5b9a\u3057\u3066\u3044\u308b\u300c&quot;EEEE&quot;\u300d\u306f\u3001\u4e0b\u8a18\u306e\u3088\u3046\u306b&quot;E&quot;\u3092\u4e00\u3064\u306e\u307f\u6307\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u300e\u66dc\u65e5\u300f\u306e\u6587\u5b57\u3092\u7121\u304f\u3057\u305f\u3001\u77ed\u3044\u66dc\u65e5\u8868\u793a\u304c\u53ef\u80fd\u3068\u306a\u308a\u307e\u3059\u306e\u3067\u3001\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>DateTimeFormatter dtfWeek = DateTimeFormatter.ofPattern(\"E\", Locale.JAPAN);<\/code><\/pre>\n<h4 class=\"Heading Title Title--s\" id=\"Bookmark-6-1\"><span class=\"Num\">6.1.<\/span>LocalDateTime\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30e1\u30bd\u30c3\u30c9<\/h4>\n<p>\u3088\u304f\u4f7f\u3046\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30e1\u30bd\u30c3\u30c9\u3092\u7d39\u4ecb\u3057\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>\u8aac\u660e<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\n\t\t\t\tgetXXX\u30e1\u30bd\u30c3\u30c9\n\t\t\t<\/td>\n<td>\n\t\t\t\t\u6307\u5b9a\u3057\u305f\u65e5\u6642\u306e\u5024\u3092\u8fd4\u3057\u307e\u3059\n\t\t\t<\/td>\n<\/tr>\n<tr>\n<td>\n\t\t\t\twithXXX\u30e1\u30bd\u30c3\u30c9\n\t\t\t<\/td>\n<td>\n\t\t\t\t\u6307\u5b9a\u3057\u305f\u65e5\u6642\u3092\u8a2d\u5b9a\u3057\u307e\u3059\n\t\t\t<\/td>\n<\/tr>\n<tr>\n<td>\n\t\t\t\tplusXXX\u30e1\u30bd\u30c3\u30c9\n\t\t\t<\/td>\n<td>\n\t\t\t\t\u6307\u5b9a\u3057\u305f\u65e5\u6642\u3092\u52a0\u7b97\u3057\u307e\u3059\n\t\t\t<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u4ee5\u4e0b\u304c\u30b5\u30f3\u30d7\u30eb\u30bd\u30fc\u30b9\u3067\u3059\u3002<\/p>\n<div class=\"Pre-title\">MyLocalDateTime3.java<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>import java.time.LocalDate;\r\nimport java.time.LocalDateTime;\r\n\r\npublic class MyLocalDateTime3 {\r\n\tpublic static void main(String[] args) {\r\n\r\n\t\tLocalDateTime ldt = LocalDateTime.now();\r\n\t\t\/\/ \u5e74\u3092\u8a2d\u5b9a\r\n\t\tldt = ldt.withYear(2020);\r\n\t\tint year = ldt.getYear();\r\n\r\n\t\t\/\/ \u8a2d\u5b9a\u3057\u305f\u5e74\u3092\u8868\u793a\r\n\t\tSystem.out.println(year + \"\u5e74\");\r\n\r\n\t\t\/\/ \u5e74\u6708\u65e5\u3092\u8a2d\u5b9a\r\n\t\tldt = ldt.with(LocalDate.of(2024, 12, 30));\r\n\r\n\t\tyear = ldt.getYear();\r\n\t\tint month = ldt.getMonthValue();\r\n\t\tint day = ldt.getDayOfMonth();\r\n\t\tSystem.out.println(year + \"\u5e74\" + month + \"\u6708\" + day + \"\u65e5\");\r\n\r\n\t\t\/\/ \u65e5\u3092\u52a0\u7b97\r\n\t\tldt = ldt.plusDays(4);\r\n\r\n\t\tyear = ldt.getYear();\r\n\t\tmonth = ldt.getMonthValue();\r\n\t\tday = ldt.getDayOfMonth();\r\n\t\tSystem.out.println(year + \"\u5e74\" + month + \"\u6708\" + day + \"\u65e5\");\r\n\t}\r\n}<\/code><\/pre>\n<div class=\"Pre-title\">\u4e0a\u8a18\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5b9f\u884c\u3057\u305f\u5834\u5408\u306e\u51fa\u529b<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>2020\u5e74\r\n2024\u5e7412\u670830\u65e5\r\n2025\u5e741\u67083\u65e5<\/code><\/pre>\n<p>\u4e0a\u8a18\u30b5\u30f3\u30d7\u30eb\u30bd\u30fc\u30b9\u3067\u306f\u3001\u4ee5\u4e0b\u306e\u90e8\u5206\u3067LocalDate\u30af\u30e9\u30b9\u3092\u7528\u3044\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"Copy prettyprint lang-js\"><code>ldt = ldt.with(LocalDate.of(2024, 12, 30));<\/code><\/pre>\n<p>\u3053\u3061\u3089\u306f\u6642\u523b\u3092\u6301\u305f\u306a\u3044\u65e5\u4ed8\u306e\u307f\u3092\u4fdd\u6301\u3059\u308b\u30af\u30e9\u30b9\u3067\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\u3092\u306f\u3058\u3081\u3001\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u306fLocalDateTime\u30af\u30e9\u30b9\u3068\u540c\u3058\u3067\u3059\u3002<br \/>\n\u306a\u304a\u3001\u65e5\u4ed8\u3092\u6301\u305f\u305a\u6642\u523b\u306e\u307f\u3092\u4fdd\u6301\u3059\u308bLocalTime\u30af\u30e9\u30b9\u3082\u3042\u308a\u307e\u3059\u3002\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u4f7f\u3044\u5206\u3051\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u307e\u305f\u3001withXXX\u30e1\u30bd\u30c3\u30c9\u3084plusXXX\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u8a08\u7b97\u3057\u305f\u5f8c\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u8fd4\u3059\u306e\u3067\u3001\u5909\u6570\u3078\u4ee3\u5165\u3059\u308b\u306e\u3092\u5fd8\u308c\u306a\u3044\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\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\">Java7\u4ee5\u524d\u306b\u4f7f\u7528\u3055\u308c\u3066\u3044\u305f\u65e5\u6642\u3092\u6271\u3046\u30af\u30e9\u30b9<\/div>\n<p>\t\u672c\u7ae0\u3067\u306f\u3001Java8\u304b\u3089\u5c0e\u5165\u3055\u308c\u305f\u65e5\u6642\u3092\u6271\u3046\u30af\u30e9\u30b9\u3092\u7d39\u4ecb\u3057\u307e\u3057\u305f\u304c\u3001Java7\u4ee5\u524d\u306f\u3001\u672c\u7ae0\u306e\u8a18\u8f09\u306f\u3067\u304d\u307e\u305b\u3093\u3002<br \/>\n\t\u305d\u306e\u305f\u3081\u3001java.util.Date\u30af\u30e9\u30b9\u3068java.util.Calendar\u30af\u30e9\u30b9\u3001\u305d\u308c\u3068java.text.SimpleDateFormat\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3057\u305f\u3002<\/p>\n<div class=\"Pre-title\">Java7\u4ee5\u524d\u306e\u30af\u30e9\u30b9\u3092\u7528\u3044\u305f\u4f8b<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>\/\/ \u4eca\u306e\u65e5\u6642\u3092Calnedar\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u3066\u8868\u793a\u3059\u308b\r\nCalendar cal = Calendar.getInstance();\r\nSimpleDateFormat sdf = new SimpleDateFormat(\"yyyy\u5e74MM\u6708dd\u65e5HH\u6642mm\u5206\");\r\nSystem.out.println(sdf.format(cal.getTime()));\r\n\r\n\/\/ \u4eca\u306e\u65e5\u6642\u3092Date\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u3066\u8868\u793a\u3059\u308b\r\nDate date = new Date();\r\nSystem.out.println(sdf.format(date));<\/code><\/pre>\n<div class=\"Pre-title\">\u4e0a\u8a18\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5b9f\u884c\u3057\u305f\u5834\u5408\u306e\u51fa\u529b<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>2018\u5e7412\u670807\u65e520\u664202\u5206\r\n2018\u5e7412\u670807\u65e520\u664202\u5206<\/code><\/pre>\n<\/div>\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>\u7df4\u7fd2\u554f\u984c1<\/h3>\n<p>\u305d\u308c\u3067\u306f\u3001Integer\u30af\u30e9\u30b9\u3068String\u30af\u30e9\u30b9\u306e\u554f\u984c\u3092\u89e3\u3044\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<h4 class=\"Heading Title Title--s\" id=\"Bookmark-7-1\"><span class=\"Num\">7.1.<\/span>\u554f\u984c1<\/h4>\n<p>\u4ee5\u4e0b\u306e\u30bd\u30fc\u30b9\u306e\u30b3\u30e1\u30f3\u30c8\u306b\u5f93\u3044\u3001\u5404\u554f\u984c\u306b\u6cbf\u3063\u305f\u30b3\u30fc\u30c9\u3092\u30d7\u30ed\u30b0\u30e9\u30e0\u30bd\u30fc\u30b9\u306e\u300c\/*\u3053\u3053\u306b\u8ffd\u52a0*\/\u300d\u306e\u90e8\u5206\u306b\u8ffd\u52a0\u3057\u3001\u5b9f\u884c\u7d50\u679c\u3068\u540c\u69d8\u306b\u51fa\u529b\u3055\u308c\u308b\u3088\u3046\u306b\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5b8c\u6210\u3055\u305b\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<div class=\"Pre-title\">InteStrMondai1.java<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>public class InteStrMondai1 {\r\n\tpublic static void main(String[] args) {\r\n\t\t\/\/ \u554f\u984c1 int\u578b\u306e250\u3092\u5185\u90e8\u306b\u6301\u3064Integer\u30af\u30e9\u30b9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u751f\u6210\u3057\u3001\r\n\t\t\/\/ Integer\u578b\u306e\u53c2\u7167\u5909\u6570tempI\u306b\u4ee3\u5165\u3057\u307e\u3057\u3087\u3046\u3002\r\n\t\tInteger tempI = \/* \u3053\u3053\u306b\u8ffd\u52a0 *\/;\r\n\t\tSystem.out.println(\"\u554f\u984c1\uff1a\" + tempI);\r\n\r\n\t\t\/\/ \u554f\u984c2 Integer\u30af\u30e9\u30b9\u306eparseInt\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\r\n\t\t\/\/ String\u578b\u306e\"20\"\u3092int\u578b\u306b\u5909\u63db\u3057\u307e\u3057\u3087\u3046\u3002\r\n\t\tint i = \/* \u3053\u3053\u306b\u8ffd\u52a0 *\/ ;\r\n\t\tSystem.out.println(\"\u554f\u984c2\uff1a\" + i);\r\n\r\n\t\t\/\/ \u554f\u984c3 Integer\u30af\u30e9\u30b9\u306eparseInt\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\r\n\t\t\/\/ 16\u9032\u6570\u8868\u8a18\u306eFF\u3092int\u578b\uff0810\u9032\u6570\uff09\u306b\u5909\u63db\u3057\u307e\u3057\u3087\u3046\u3002\r\n\t\tint j = \/* \u3053\u3053\u306b\u8ffd\u52a0 *\/ ;\r\n\t\tSystem.out.println(\"\u554f\u984c3\uff1a\" + j);\r\n\r\n\t\t\/\/ \u554f\u984c4 String\u30af\u30e9\u30b9\u306evalueOf\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\r\n\t\t\/\/ int\u578b\u306e250\u3092String\u578b\u306b\u5909\u63db\u3057\u307e\u3057\u3087\u3046\u3002\r\n\t\tint k = 250;\r\n\t\tString tempS = \/* \u3053\u3053\u306b\u8ffd\u52a0 *\/;\r\n\t\tSystem.out.println(\"\u554f\u984c4\uff1a\" + tempS);\r\n\r\n\t\t\/\/ \u554f\u984c5 String\u30af\u30e9\u30b9\u306eequals\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\r\n\t\t\/\/ 2\u3064\u306e\u6587\u5b57\u5217\u304c\u30a4\u30b3\u30fc\u30eb\u304b\u5426\u304b\u3092\u5224\u5b9a\u3057\u307e\u3057\u3087\u3046\u3002\r\n\t\tString tempS1 = \"\u304a\u306f\u3088\u3046\";\r\n\t\tString tempS2 = \"\u304a\u306f\u3088\u3046\";\r\n\t\tif (\/* \u3053\u3053\u306b\u8ffd\u52a0 *\/) {\r\n\t\t\tSystem.out.println(\"\u554f\u984c5\uff1a\u540c\u3058\u3067\u3059\u3002\");\r\n\r\n\t\t} else {\r\n\t\t\tSystem.out.println(\"\u554f\u984c5\uff1a\u9055\u3044\u307e\u3059\u3002\");\r\n\t\t}\r\n\r\n\t\ttempS2 = \"\u3053\u3093\u306b\u3061\u306f\";\r\n\t\tif (\/* \u3053\u3053\u306b\u8ffd\u52a0 *\/) {\r\n\t\t\tSystem.out.println(\"\u554f\u984c5\uff1a\u9055\u3044\u307e\u3059\u3002\");\r\n\r\n\t\t} else {\r\n\t\t\tSystem.out.println(\"\u554f\u984c5\uff1a\u540c\u3058\u3067\u3059\u3002\");\r\n\t\t}\r\n\r\n\t\t\/\/ \u554f\u984c6 String\u30af\u30e9\u30b9\u306eindexOf\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\r\n\t\t\/\/ \u6587\u5b57\u5217\u306e\u4e2d\u306b\u300c@\u300d\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u304b\u5224\u5b9a\u3057\u307e\u3057\u3087\u3046\u3002\r\n\t\tString mail = \"test@test.co.jp\";\r\n\t\tif (\/* \u3053\u3053\u306b\u8ffd\u52a0 *\/) {\r\n\t\t\tSystem.out.println(\"\u554f\u984c6\uff1a@\u304c\u3042\u308a\u307e\u3059\u3002\");\r\n\r\n\t\t} else {\r\n\t\t\tSystem.out.println(\"\u554f\u984c6\uff1a@\u304c\u3042\u308a\u307e\u305b\u3093\u3002\");\r\n\t\t}\r\n\r\n\t\tmail = \"testtest.co.jp\";\r\n\t\tif (\/* \u3053\u3053\u306b\u8ffd\u52a0 *\/) {\r\n\t\t\tSystem.out.println(\"\u554f\u984c6\uff1a@\u304c\u3042\u308a\u307e\u3059\u3002\");\r\n\r\n\t\t} else {\r\n\t\t\tSystem.out.println(\"\u554f\u984c6\uff1a@\u304c\u3042\u308a\u307e\u305b\u3093\u3002\");\r\n\t\t}\r\n\r\n\t\t\/\/ \u554f\u984c7 String\u30af\u30e9\u30b9\u306esubstring\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\r\n\t\t\/\/ \u6587\u5b57\u5217\u304b\u3089\u6708\u306e\u5024\u3092\u629c\u304d\u51fa\u3057\u307e\u3057\u3087\u3046\u3002\r\n\t\tString theDate = \"2010-06-11\";\r\n\t\tString month = \/* \u3053\u3053\u306b\u8ffd\u52a0 *\/ ;\r\n\t\tSystem.out.println(\"\u554f\u984c7\uff1a\" + month + \"\u6708\");\r\n\r\n\t\t\/\/ \u554f\u984c8 String\u30af\u30e9\u30b9\u306esplit\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\r\n\t\t\/\/ \u300caa\u300d\u3092\u533a\u5207\u308a\u6587\u5b57\u3068\u3057\u3066\u5206\u5272\u3057\u307e\u3057\u3087\u3046\u3002\r\n\t\tString animal = \"\u308f\u3093aa\u306b\u3083\u30fcaa\u3053\u3051\u3053\u3063\u3053\u30fcaa\u30d6\u30d2aa\u30e2\u30fca\u30d2\u30d2\u30fc\u30f3\";\r\n\t\tString[] splAnimal = \/* \u3053\u3053\u306b\u8ffd\u52a0 *\/ ;\r\n\r\n\t\tSystem.out.println(\"\u554f\u984c8\uff1a\");\r\n\r\n\t\tfor (String str : splAnimal) {\r\n\t\t\tSystem.out.println(str);\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>\u554f\u984c1\uff1a250\r\n\u554f\u984c2\uff1a20\r\n\u554f\u984c3\uff1a255\r\n\u554f\u984c4\uff1a250\r\n\u554f\u984c5\uff1a\u540c\u3058\u3067\u3059\u3002\r\n\u554f\u984c5\uff1a\u9055\u3044\u307e\u3059\u3002\r\n\u554f\u984c6\uff1a@\u304c\u3042\u308a\u307e\u3059\u3002\r\n\u554f\u984c6\uff1a@\u304c\u3042\u308a\u307e\u305b\u3093\u3002\r\n\u554f\u984c7\uff1a06\u6708\r\n\u554f\u984c8\uff1a\r\n\u308f\u3093\r\n\u306b\u3083\u30fc\r\n\u3053\u3051\u3053\u3063\u3053\u30fc\r\n\u30d6\u30d2\r\n\u30e2\u30fca\u30d2\u30d2\u30fc\u30f3<\/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-8\"><span class=\"Num\">8.<\/span>\u7df4\u7fd2\u554f\u984c2<\/h3>\n<p>LocalDateTime\u30af\u30e9\u30b9\u306e\u7df4\u7fd2\u554f\u984c\u3067\u3059\u3002<\/p>\n<h4 class=\"Heading Title Title--s\" id=\"Bookmark-8-1\"><span class=\"Num\">8.1.<\/span>\u554f\u984c1<\/h4>\n<p>LocalDateTime\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u3066\u30011999\u5e7412\u670831\u65e5\u306e\u65e5\u6642\u3092\u53d6\u5f97\u3057\u3001\u300c1999\u5e7412\u670831\u65e5\u306f\u3001\u91d1\u66dc\u65e5\u3067\u3059\u3002\u300d\u3068\u30b3\u30f3\u30bd\u30fc\u30eb\u306b\u8868\u793a\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\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\">LocalDateTimeMondai1.java<\/div>\n<pre class=\"Copy prettyprint lang-js\"><code>import java.time.LocalDateTime;\r\nimport java.time.format.TextStyle;\r\nimport java.util.Locale;\r\n\r\npublic class LocalDateTimeMondai1 {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\t\/\/ LocalDateTime\u30af\u30e9\u30b9\u30921999\u5e7412\u670831\u65e5\u3067\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\r\n\t\tLocalDateTime ldt = LocalDateTime.of(1999, 12, 31, 23, 59, 59);\r\n\r\n\t\t\/\/ \u5e74\u3001\u6708\u3001\u65e5\u3092\u53d6\u5f97\r\n\t\tint year = ldt.getYear();\r\n\t\tint month = ldt.getMonthValue();\r\n\t\tint day = ldt.getDayOfMonth();\r\n\r\n\t\t\/\/ \u66dc\u65e5\u3092\u53d6\u5f97\r\n\t\tString week = ldt.getDayOfWeek().getDisplayName(TextStyle.FULL, Locale.JAPAN);\r\n\r\n\t\t\/\/ \u7d50\u679c\u3092\u30b3\u30f3\u30bd\u30fc\u30eb\u306b\u8868\u793a\r\n\t\tSystem.out.println(year + \"\u5e74\" + month + \"\u6708\" + day + \"\u65e5\u306f\u3001\" + week + \"\u3067\u3059\u3002\");\r\n\r\n\t}\r\n\r\n}<\/code><\/pre>\n<p>\t\t\u6700\u521d\u306b\u3001LocalDateTime\u3092of\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066\u65e5\u6642\u3092\u6307\u5b9a\u3057\u305f\u3046\u3048\u3067\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\u3057\u3066\u3044\u307e\u3059\u3002<br \/>\n\t\t\u306a\u304a\u3001\u6642\u5206\u79d2\u306e\u90e8\u5206\u306f\u3001\u4eca\u56de\u306e\u554f\u984c\u3067\u306f\u4e0d\u8981\u3067\u3059\u306e\u3067\u3001\u4efb\u610f\u306e\u5024\u3067\u554f\u984c\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\t\tLocalDateTime\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304b\u3089\u3001\u5404\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066\u5e74\u6708\u65e5\u3001\u66dc\u65e5\u3092\u53d6\u5f97\u3057\u3001\u6700\u5f8c\u306b\u305d\u306e\u5024\u3092\u7d44\u307f\u5408\u308f\u305b\u3066\u8868\u793a\u3057\u307e\u3059\u3002\n\t<\/p><\/div>\n<\/div>\n<h4 class=\"Heading Title Title--s\" id=\"Bookmark-8-2\"><span class=\"Num\">8.2.<\/span>\u554f\u984c2<\/h4>\n<p>LocalDateTime\u30af\u30e9\u30b9\u3068DateTimeFormatter\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u3066\u30015\u5e74\u5f8c\u306e\u4eca\u65e5\u306e\u65e5\u4ed8\u3092\u53d6\u5f97\u3057\u3001\u300c5\u5e74\u5f8c\u306e\u4eca\u65e5\u306f\u3001xxxx\u5e74xx\u6708xx\u65e5\u3067\u3059\u3002\u300d\u3068\u30b3\u30f3\u30bd\u30fc\u30eb\u306b\u8868\u793a\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\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<\/p>\n<div class=\"Separator\">\n<div class=\"Separator__child\"><\/div>\n<\/div>\n<h3 class=\"Heading Title Title--m\" id=\"Bookmark-9\"><span class=\"Num\">9.<\/span>\u672c\u7ae0\u306e\u307e\u3068\u3081<\/h3>\n<ul class=\"Base-list\">\n<li class=\"Base-list__child\">Java\u306b\u306f\u6a19\u6e96\u3067\u7528\u610f\u3055\u308c\u305f\u30af\u30e9\u30b9\u304c\u591a\u304f\u3042\u308a\u3001\u305d\u306e\u60c5\u5831\u3092\u307e\u3068\u3081\u305f\u3082\u306e\u304c\u300c <a class=\"Post-link Ext\"\n\t\t\thref=\"https:\/\/docs.oracle.com\/javase\/jp\/17\/docs\/api\/index.html\">API\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8<\/a>\u300d\u3067\u3042\u308b\u3002 <\/li>\n<li 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class=\"Base-list__child\">\u65e5\u6642\u3092\u6271\u3046\u30af\u30e9\u30b9\u3068\u3057\u3066\u300cLocalDateTime\u30af\u30e9\u30b9\u300d\u304c\u3042\u308a\u3001\u300cDateTimeFormatter\u30af\u30e9\u30b9\u300d\u3092\u7528\u3044\u308c\u3070\u8868\u793a\u65b9\u6cd5\u3092\u7d30\u304b\u304f\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/li>\n<\/ul>\n<p>\u672c\u7ae0\u3067\u51fa\u3066\u304d\u305f\u30af\u30e9\u30b9\u3084\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u4ee5\u964d\u306e\u7ae0\u3060\u3051\u3067\u306f\u306a\u304f\u3001\u5b9f\u52d9\u3067\u3082\u5229\u7528\u3059\u308b\u6a5f\u4f1a\u304c\u591a\u304f\u3042\u308a\u307e\u3059\u3002<br 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