{"id":264,"date":"2022-12-26T15:01:28","date_gmt":"2022-09-30T23:30:20","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/%e3%83%a1%e3%82%bd%e3%83%83%e3%83%89x%e3%81%af%e3%82%bf%e3%82%a4%e3%83%97y%e3%81%ab%e5%af%be%e3%81%97%e3%81%a6%e6%9b%96%e6%98%a7%e3%81%a7%e3%81%99%e3%80%82java%e3%81%ae%e6%9b%96%e6%98%a7%e3%81%aa\/"},"modified":"2025-07-31T22:08:35","modified_gmt":"2025-07-31T13:08:35","slug":"%e3%83%a1%e3%82%bd%e3%83%83%e3%83%89x%e3%81%af%e3%82%bf%e3%82%a4%e3%83%97y%e3%81%ab%e5%af%be%e3%81%97%e3%81%a6%e6%9b%96%e6%98%a7%e3%81%a7%e3%81%99%e3%80%82java%e3%81%ae%e6%9b%96%e6%98%a7%e3%81%aa","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/%e3%83%a1%e3%82%bd%e3%83%83%e3%83%89x%e3%81%af%e3%82%bf%e3%82%a4%e3%83%97y%e3%81%ab%e5%af%be%e3%81%97%e3%81%a6%e6%9b%96%e6%98%a7%e3%81%a7%e3%81%99%e3%80%82java%e3%81%ae%e6%9b%96%e6%98%a7%e3%81%aa\/","title":{"rendered":"\u30e1\u30bd\u30c3\u30c9X\u306f\u30bf\u30a4\u30d7Y\u306b\u5bfe\u3057\u3066\u66d6\u6627\u3067\u3059\u3002Java\u306e\u66d6\u6627\u306a\u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057\u306enull\u30a8\u30e9\u30fc\u3067\u3059\u3002"},"content":{"rendered":"<p>\u3053\u308c\u3092\u8aad\u3093\u3067\u3044\u308b\u306a\u3089\u3001\u304a\u305d\u3089\u304fJava\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u30bf\u30fc\u30df\u30ca\u30eb\u3084\u3069\u3093\u306aJava IDE\u3067\u30b3\u30f3\u30d1\u30a4\u30eb\u3059\u308b\u969b\u306b\u3001\u30e1\u30bd\u30c3\u30c9X\u306f\u578bY\u306b\u5bfe\u3057\u3066\u66d6\u6627\u306a\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3057\u305f\u3002<\/p>\n<h2>Java\u306e\u66d6\u6627\u306a\u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057<\/h2>\n<p>\u4ee5\u4e0b\u3067\u306f\u3001\u3044\u304f\u3064\u304b\u306e\u4f8b\u3092\u4f7f\u7528\u3057\u3066\u3001\u306a\u305cJava\u306e\u66d6\u6627\u306a\u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3059\u308b\u306e\u304b\u3092\u8aac\u660e\u3057\u307e\u3059\u3002\u3053\u306e\u66d6\u6627\u306a\u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057\u30a8\u30e9\u30fc\u306f\u5e38\u306b\u30e1\u30bd\u30c3\u30c9\u306e\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u3068\u4e00\u7dd2\u306b\u73fe\u308c\u3001\u30b3\u30f3\u30d1\u30a4\u30e9\u304c\u3069\u306e\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u3055\u308c\u305f\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u304b\u5224\u65ad\u3067\u304d\u306a\u304f\u306a\u308b\u5834\u5408\u306b\u767a\u751f\u3057\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u3088\u3046\u306aJava\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u3042\u308b\u3068\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.scdev.errors;\r\n\r\npublic class Test {\r\n\r\n\tpublic void foo(Object o) {\r\n\t\tSystem.out.println(\"Object\");\r\n\t}\r\n\r\n\tpublic void foo(String s) {\r\n\t\tSystem.out.println(\"String\");\r\n\t}\r\n\tpublic static void main(String[] args) {\r\n\t\tnew Test().foo(null);\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\u5b8c\u74a7\u306b\u30b3\u30f3\u30d1\u30a4\u30eb\u3055\u308c\u3001\u5b9f\u884c\u3059\u308b\u3068\u300cString\u300d\u3068\u51fa\u529b\u3055\u308c\u307e\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u306b\u3088\u3063\u3066\u30e1\u30bd\u30c3\u30c9foo(String s)\u304c\u547c\u3073\u51fa\u3055\u308c\u307e\u3057\u305f\u3002\u3053\u308c\u306f\u3001Java\u30b3\u30f3\u30d1\u30a4\u30e9\u304c\u6700\u3082\u7279\u6b8a\u306a\u5165\u529b\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u6301\u3064\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u305d\u3046\u3068\u3059\u308b\u305f\u3081\u3067\u3059\u3002String\u306e\u89aa\u30af\u30e9\u30b9\u306fObject\u3067\u3042\u308b\u3053\u3068\u3092\u77e5\u3063\u3066\u3044\u308b\u305f\u3081\u3001\u9078\u629e\u306f\u7c21\u5358\u3067\u3057\u305f\u3002\u4ee5\u4e0b\u306fJava\u8a00\u8a9e\u4ed5\u69d8\u306e\u4e00\u90e8\u3067\u3059\u3002<\/p>\n<p>\u3082\u3057\u8907\u6570\u306e\u30e1\u30f3\u30d0\u30fc\u30e1\u30bd\u30c3\u30c9\u304c\u30e1\u30bd\u30c3\u30c9\u306e\u547c\u3073\u51fa\u3057\u306b\u30a2\u30af\u30bb\u30b9\u53ef\u80fd\u304b\u3064\u9069\u7528\u53ef\u80fd\u3067\u3042\u308b\u5834\u5408\u3001Java\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u306f\u6700\u3082\u5177\u4f53\u7684\u306a\u30e1\u30bd\u30c3\u30c9\u3092\u9078\u629e\u3059\u308b\u30eb\u30fc\u30eb\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<p>\u300cnull\u300d\u3092\u6e21\u3059\u7406\u7531\u306f\u3001\u305d\u308c\u304c\u3069\u306e\u3088\u3046\u306a\u30bf\u30a4\u30d7\u306e\u5f15\u6570\u3067\u3082\u6a5f\u80fd\u3059\u308b\u304b\u3089\u3067\u3059\u3002\u4ed6\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u6e21\u3059\u3068\u3001Java\u30b3\u30f3\u30d1\u30a4\u30e9\u306e\u30e1\u30bd\u30c3\u30c9\u306e\u9078\u629e\u304c\u5bb9\u6613\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<h3>\u65b9\u6cd5X\u306f\u30bf\u30a4\u30d7Y\u306b\u3064\u3044\u3066\u306f\u3042\u3044\u307e\u3044\u3067\u3059\u3002<\/h3>\n<p>\u4eca\u3001\u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u306b\u4ee5\u4e0b\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u8ffd\u52a0\u3057\u307e\u3057\u3087\u3046\u3002 (Ima, j\u014dki no k\u014ddo ni ika no mesoddo o tsuika shimashou.)<\/p>\n<pre class=\"post-pre\"><code>public void foo(Integer i){\r\n\tSystem.out.println(\"Integer\");\r\n}\r\n<\/code><\/pre>\n<p>\u30c6\u30b9\u30c8\u306e\u30bf\u30a4\u30d7\u306b\u5bfe\u3057\u3066\u3001\u30e1\u30bd\u30c3\u30c9\u300cfoo(Object)\u300d\u306f\u66d6\u6627\u3067\u3059\u3002String\u30af\u30e9\u30b9\u3068Integer\u30af\u30e9\u30b9\u306e\u4e21\u65b9\u304c\u89aa\u30af\u30e9\u30b9\u3068\u3057\u3066Object\u3092\u6301\u3061\u3001\u7d99\u627f\u95a2\u4fc2\u304c\u306a\u3044\u305f\u3081\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001Java\u30b3\u30f3\u30d1\u30a4\u30e9\u306f\u3069\u3061\u3089\u3082\u3088\u308a\u5177\u4f53\u7684\u3068\u306f\u898b\u306a\u3055\u305a\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u547c\u3073\u51fa\u3057\u30a8\u30e9\u30fc\u304c\u8d77\u3053\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.scdev.strings;\r\n\r\npublic class Test {\r\n\r\n\tpublic void foo(Object o) {\r\n\t\tSystem.out.println(\"Object\");\r\n\t}\r\n\r\n\tpublic void foo(Exception e) {\r\n\t\tSystem.out.println(\"Exception\");\r\n\t}\r\n\r\n\tpublic void foo(NullPointerException ne) {\r\n\t\tSystem.out.println(\"NullPointerException\");\r\n\t}\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tnew Test().foo(null);\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n<p>\u4e0a\u8ff0\u306e\u8aac\u660e\u306e\u901a\u308a\u3001foo(NullPointerException ne)\u306f\u6700\u3082\u5177\u4f53\u7684\u306a\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002\u3053\u308c\u306fException\u30af\u30e9\u30b9\u304b\u3089\u7d99\u627f\u3055\u308c\u3066\u3044\u308b\u305f\u3081\u3001\u3053\u306e\u30b3\u30fc\u30c9\u306f\u554f\u984c\u306a\u304f\u30b3\u30f3\u30d1\u30a4\u30eb\u3055\u308c\u3001\u5b9f\u884c\u3055\u308c\u308b\u3068\u300cNullPointerException\u300d\u3068\u51fa\u529b\u3055\u308c\u307e\u3059\u3002\u3053\u306e\u8a18\u4e8b\u304cJava\u306e\u66d6\u6627\u306a\u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057\u30b3\u30f3\u30d1\u30a4\u30e9\u30a8\u30e9\u30fc\u306b\u3064\u3044\u3066\u306e\u7591\u554f\u3092\u89e3\u6d88\u3059\u308b\u304a\u624b\u4f1d\u3044\u3068\u306a\u308c\u3070\u5e78\u3044\u3067\u3059\u3002\u3082\u3057\u4f55\u304b\u8ffd\u52a0\u3057\u305f\u3044\u3053\u3068\u3084\u7591\u554f\u304c\u3042\u308c\u3070\u3001\u30b3\u30e1\u30f3\u30c8\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u3053\u308c\u3092\u8aad\u3093\u3067\u3044\u308b\u306a\u3089\u3001\u304a\u305d\u3089\u304fJava\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u30bf\u30fc\u30df\u30ca\u30eb\u3084\u3069\u3093\u306aJava IDE\u3067\u30b3\u30f3\u30d1\u30a4\u30eb\u3059\u308b\u969b\u306b\u3001\u30e1\u30bd\u30c3\u30c9X\u306f\u578bY\u306b\u5bfe\u3057\u3066\u66d6\u6627\u306a\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3057\u305f\u3002 Java\u306e\u66d6\u6627\u306a\u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057 \u4ee5\u4e0b\u3067\u306f\u3001\u3044\u304f\u3064\u304b\u306e\u4f8b\u3092\u4f7f [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-264","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ 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