{"id":208,"date":"2024-08-09T10:39:08","date_gmt":"2024-08-09T01:39:08","guid":{"rendered":"https:\/\/techfun.cc\/?p=208"},"modified":"2025-03-07T13:25:51","modified_gmt":"2025-03-07T04:25:51","slug":"java_base_read_error_message","status":"publish","type":"post","link":"https:\/\/techfun.cc\/java-base\/java_base_read_error_message.html","title":{"rendered":"Java\u306e\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u8aad\u307f\u65b9\u3068\u305d\u306e\u89e3\u6d88"},"content":{"rendered":"

1.<\/span>\u672c\u7ae0\u3067\u306e\u5b66\u7fd2\u9805\u76ee<\/h3>\n

\u672c\u7ae0\u3067\u306f\u3001Java\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u52d5\u4f5c\u3055\u305b\u305f\u969b\u3001\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f\u6642\u306b\u8868\u793a\u3055\u308c\u308b\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u8aad\u307f\u65b9\u3068\u305d\u306e\u89e3\u6d88\u65b9\u6cd5\u306b\u3064\u3044\u3066\u5b66\u7fd2\u3057\u307e\u3059\u3002<\/p>\n

\n
<\/div>\n<\/div>\n

2.<\/span>\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3068\u306f<\/h3>\n

\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u52d5\u4f5c\u3059\u308b\u969b\u306b\u3001\u4e88\u671f\u3057\u306a\u3044\u72b6\u614b\u304c\u767a\u751f\u3057\u305f\u6642\u306b\u8868\u793a\u3055\u308c\u308b\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u3053\u3068\u3067\u3059\u3002
\n\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306b\u306f\u3001\u8aa4\u308a\u306e\u767a\u751f\u7b87\u6240\u3084\u7a2e\u985e\u3001\u5185\u5bb9\u306a\u3069\u304c\u8868\u793a\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u3001\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u6b63\u3057\u304f\u8aad\u307f\u53d6\u308b\u3053\u3068\u306f\u30a8\u30e9\u30fc\u3084\u4e0d\u5177\u5408\u306e\u89e3\u6d88\u306e\u305f\u3081\u306b\u3068\u3066\u3082\u5fc5\u8981\u306a\u3053\u3068\u3067\u3059\u3002
\n\u3053\u3053\u3067\u306f\u3001\u7c21\u5358\u306a\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u901a\u3057\u3066\u3001\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u8aad\u307f\u65b9\u3068\u305d\u306e\u89e3\u6d88\u65b9\u6cd5\u3092\u5b66\u3093\u3067\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n

\u306a\u304a\u3001\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u5185\u5bb9\u306f\u3001Java\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u306b\u3088\u3063\u3066\u7570\u306a\u308a\u307e\u3059\u3002
\n\u3053\u306e\u7ae0\u3067\u8868\u793a\u3055\u308c\u308b\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306fJava17\u306e\u5185\u5bb9\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n

\n
<\/div>\n<\/div>\n

3.<\/span>\uff11\u3064\u306e\u30af\u30e9\u30b9\u5185\u3067\u767a\u751f\u3057\u305f\u30a8\u30e9\u30fc\u306e\u5834\u5408<\/h3>\n

\u4ee5\u4e0b\u306e\u30b5\u30f3\u30d7\u30eb\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5b9f\u88c5\u3057\u3066\u3001\u5b9f\u884c\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n

3.1.<\/span>\u5b9f\u88c5<\/h4>\n

\u300cjp.techfun\u300d\u30d1\u30c3\u30b1\u30fc\u30b8\u306b\u3001\u4ee5\u4e0b\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u6210\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n

ErrorMessageSample01.java<\/div>\n
package jp.techfun;\r\n\r\npublic class ErrorMessageSample01 {\r\n\r\n\tpublic static void main(String[] args) {\r\n\r\n\t\tString str = null;\r\n\t\tint converted = Integer.parseInt(str);\r\n\r\n\t\tSystem.out.println(\"int\u578b\u5909\u63db\u5f8c\u306e\u5024\u306f \" + converted + \" \u3067\u3059\u3002\");\r\n\t}\r\n}<\/code><\/pre>\n
3.2.<\/span>\u52d5\u4f5c\u78ba\u8a8d<\/h4>\n
\u4e0a\u8a18\u3067\u4f5c\u6210\u3057\u305f\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u30b3\u30f3\u30bd\u30fc\u30eb\u306b\u51fa\u529b\u3055\u308c\u307e\u3059\u3002<\/p>\n
Exception in thread \"main\" java.lang.NumberFormatException: Cannot parse null string\r\n\tat java.base\/java.lang.Integer.parseInt(Integer.java:630)\r\n\tat java.base\/java.lang.Integer.parseInt(Integer.java:786)\r\n\tat jp.techfun.ErrorMessageSample01.main(ErrorMessageSample01.java:8)<\/code><\/pre>\n
3.3.<\/span>\u30a8\u30e9\u30fc\u60c5\u5831\u306e\u78ba\u8a8d<\/h4>\n
\u305d\u308c\u3067\u306f\u3001\u30a8\u30e9\u30fc\u60c5\u5831\u3092\u78ba\u8a8d\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002
\n\u4ee5\u4e0b\u306e\u30b9\u30c6\u30c3\u30d7\u306b\u5f93\u3063\u3066\u8aad\u3093\u3067\u3044\u304d\u307e\u3059\u3002<\/p>\n
    \n
  1. \u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u5168\u4f53\u3092\u78ba\u8a8d\u3059\u308b<\/li>\n
  2. \u300c\uff5e\uff5eException\u300d\u3068\u3044\u3046\u6587\u5b57\u3092\u63a2\u3059<\/li>\n
  3. \u81ea\u5206\u304c\u4f5c\u6210\u3057\u305f\u30af\u30e9\u30b9\u540d\u3084\u30d5\u30a1\u30a4\u30eb\u540d\u3001\u5909\u6570\u540d\u306a\u3069\u3092\u63a2\u3059<\/li>\n<\/ol>\n
    3.3.1.<\/span>\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u5168\u4f53\u3092\u78ba\u8a8d\u3059\u308b<\/h5>\n
    Eclipse\u306e\u30b3\u30f3\u30bd\u30fc\u30eb\u306b\u306f\u53ce\u307e\u308a\u304d\u3089\u306a\u3044\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u8868\u793a\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002
    \n\u307e\u305a\u306f\u3001\u30b9\u30af\u30ed\u30fc\u30eb\u30d0\u30fc\u3092\u4e0a\u4e0b\u5de6\u53f3\u306b\u52d5\u304b\u3057\u3066\u3001\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u5168\u4f53\u3092\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002
    \n\u3053\u306e\u6642\u70b9\u3067\u306f\u3001\u5185\u5bb9\u304c\u7406\u89e3\u3067\u304d\u306a\u304f\u3066\u3082\u69cb\u3044\u307e\u305b\u3093\u3002
    \n\u4e0a\u4e0b\u5de6\u53f3\u306b\u30b9\u30af\u30ed\u30fc\u30eb\u30d0\u30fc\u3092\u52d5\u304b\u3057\u3066\u3001\u3069\u306e\u304f\u3089\u3044\u306e\u5206\u91cf\u304c\u3042\u308b\u306e\u304b\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u4fee\u6b63\u524d\u5f8c\u3067\u5185\u5bb9\u304c\u5909\u308f\u3063\u305f\u304b\u306a\u3069\u3001\u304f\u307e\u306a\u304f\u76ee\u3092\u901a\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
    3.3.2.<\/span>\u300c\uff5e\uff5eException\u300d\u3068\u3044\u3046\u6587\u5b57\u3092\u63a2\u3059<\/h5>\n
    \u6b21\u306b\u3001\u30a8\u30e9\u30fc\u306e\u7a2e\u985e\u3092\u7279\u5b9a\u3059\u308b\u305f\u3081\u306b\u5fc5\u8981\u306a\u60c5\u5831\u3068\u3057\u3066\u3001\u300c\uff5e\uff5eException\u300d\u3068\u3044\u3046\u6587\u5b57\u3092\u63a2\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
    \u4eca\u56de\u306e\u30b5\u30f3\u30d7\u30eb\u30d7\u30ed\u30b0\u30e9\u30e0\u300cErrorMessageSample01.java\u300d\u306e\u5834\u5408\u306f\u3001\u4ee5\u4e0b\u306e\u56f3\u306e\u3088\u3046\u306b\u300cNumberFormatException\u300d\u3092\u898b\u3064\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002
    \n\u300cNumberFormatException\u300d\u306f\u3001\u6587\u5b57\u5217\u3092\u6570\u5024\u306b\u5909\u63db\u3057\u3088\u3046\u3068\u3057\u305f\u304c\u3001\u3046\u307e\u304f\u5909\u63db\u3067\u304d\u306a\u304b\u3063\u305f\u3068\u304d\u306b\u767a\u751f\u3057\u307e\u3059\u3002
    \n\u305d\u3057\u3066\u3001\u305d\u306e\u96a3\u306b\u30a8\u30e9\u30fc\u306e\u539f\u56e0\u304c\u66f8\u304b\u308c\u3066\u304a\u308a\u3001\u4eca\u56de\u306f\u300cCannot parse null string\u300d\u3068\u66f8\u304b\u308c\u3066\u3044\u308b\u3053\u3068\u304b\u3089\u3001\u300cString\u578b\u306enull\u3092\u5909\u63db\u3067\u304d\u306a\u304b\u3063\u305f\u300d\u3053\u3068\u304c\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n

    \n\t\"single
    \n<\/a><\/p>\n
    Java\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306b\u304a\u3044\u3066Exception\u306e\u7a2e\u985e\u306f\u69d8\u3005\u3042\u308a\u307e\u3059\u304c\u3001\u4ee3\u8868\u7684\u306a\u3082\u306e\u3068\u3057\u3066\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u3082\u306e\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n