{"id":123062,"date":"2024-03-24T09:39:09","date_gmt":"2024-03-24T00:39:09","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%a7%e6%96%87%e5%ad%97%e5%88%97%e3%82%a8%e3%83%a9%e3%83%bc%e3%82%92%e8%a7%a3%e6%b1%ba%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95%e3%81%af%ef%bc%9f\/"},"modified":"2024-04-04T23:38:35","modified_gmt":"2024-04-04T14:38:35","slug":"java%e3%81%a7%e6%96%87%e5%ad%97%e5%88%97%e3%82%a8%e3%83%a9%e3%83%bc%e3%82%92%e8%a7%a3%e6%b1%ba%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95%e3%81%af%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%a7%e6%96%87%e5%ad%97%e5%88%97%e3%82%a8%e3%83%a9%e3%83%bc%e3%82%92%e8%a7%a3%e6%b1%ba%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95%e3%81%af%ef%bc%9f\/","title":{"rendered":"Java\u3067\u6587\u5b57\u5217\u30a8\u30e9\u30fc\u3092\u89e3\u6c7a\u3059\u308b\u65b9\u6cd5\u306f\uff1f"},"content":{"rendered":"<p>Java\u3067String\u3092\u4f7f\u7528\u3059\u308b\u969b\u306b\u767a\u751f\u3059\u308b\u30a8\u30e9\u30fc\u306b\u306f\u8907\u6570\u306e\u539f\u56e0\u304c\u8003\u3048\u3089\u308c\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u4e00\u822c\u7684\u306a\u30a8\u30e9\u30fc\u3068\u89e3\u6c7a\u7b56\u3092\u307e\u3068\u3081\u3066\u3044\u307e\u3059\u3002<\/p>\n<ol>\n<li>NullPointerException\uff08\u30cc\u30eb\u30dd\u30a4\u30f3\u30bf\u4f8b\u5916\uff09\uff1a\u7a7a\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u4e0a\u3067\u6587\u5b57\u5217\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u305d\u3046\u3068\u3057\u305f\u5834\u5408\u306a\u3069\u306b\u767a\u751f\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u56de\u907f\u65b9\u6cd5\u3068\u3057\u3066\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u7a7a\u3067\u306f\u306a\u3044\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u6761\u4ef6\u5206\u5c90\u3092\u7528\u3044\u308b\u306a\u3069\u306e\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n<\/ol>\n<p>\u4f8b\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">str<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-literal\">null<\/span>;\r\n<span class=\"hljs-keyword\">if<\/span> (str != <span class=\"hljs-literal\">null<\/span>) {\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">length<\/span> <span class=\"hljs-operator\">=<\/span> str.length(); <span class=\"hljs-comment\">\/\/ \u8c03\u7528String\u7684\u65b9\u6cd5\u4e4b\u524d\uff0c\u5148\u5224\u65ad\u5bf9\u8c61\u662f\u5426\u4e3a\u7a7a<\/span>\r\n}\r\n<\/code><\/pre>\n<ol>\n<li>\u6587\u5b57\u5217\u5185\u306e\u5b58\u5728\u3057\u306a\u3044\u7d22\u5f15\u4f4d\u7f6e\u3078\u306e\u30a2\u30af\u30bb\u30b9\u306b\u3088\u3063\u3066\u767a\u751f\u3057\u307e\u3059\u3002\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u6709\u52b9\u306a\u7bc4\u56f2\u5185\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3059\u308b\u306e\u304c\u89e3\u6c7a\u7b56\u3067\u3059\u3002<\/li>\n<\/ol>\n<p>\u30cd\u30a4\u30c6\u30a3\u30d6\u306a\u65e5\u672c\u8a9e\u3067\u8a00\u3044\u63db\u3048\u3066\u304f\u3060\u3055\u3044\u30011\u3064\u306e\u30aa\u30d7\u30b7\u30e7\u30f3\u306e\u307f\u304c\u5fc5\u8981\u3067\u3059\u3002\u4f8b\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">str<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-string\">\"Hello\"<\/span>;\r\n<span class=\"hljs-type\">char<\/span> <span class=\"hljs-variable\">ch<\/span> <span class=\"hljs-operator\">=<\/span> str.charAt(<span class=\"hljs-number\">10<\/span>); <span class=\"hljs-comment\">\/\/ \u8bd5\u56fe\u8bbf\u95ee\u7d22\u5f15\u4e3a10\u7684\u5b57\u7b26\uff0c\u4f46\u662f\u5b57\u7b26\u4e32\u53ea\u67095\u4e2a\u5b57\u7b26\uff0c\u4f1a\u629b\u51fa\u5f02\u5e38<\/span>\r\n<\/code><\/pre>\n<ol>\n<li>IllegalArgumentException\uff08\u9055\u6cd5\u306a\u5f15\u6570\u4f8b\u5916\uff09\uff1a\u3053\u308c\u306f\u4e00\u822c\u7684\u306b\u3001String\u30e1\u30bd\u30c3\u30c9\u306b\u6e21\u3059\u5f15\u6570\u304c\u4e0d\u9069\u5207\u3067\u3042\u308b\u5834\u5408\u306b\u767a\u751f\u3057\u307e\u3059\u3002\u89e3\u6c7a\u7b56\u306f\u3001\u9069\u5207\u306a\u5f15\u6570\u3092\u6e21\u3059\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u3053\u3068\u3067\u3059\u3002<\/li>\n<\/ol>\n<p>\u4f8b\u3068\u3057\u3066<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">str<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-string\">\"Hello\"<\/span>;\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">startIndex<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-number\">5<\/span>;\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">endIndex<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-number\">1<\/span>;\r\n<span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">subStr<\/span> <span class=\"hljs-operator\">=<\/span> str.substring(startIndex, endIndex); <span class=\"hljs-comment\">\/\/ \u7ed3\u675f\u7d22\u5f15\u5c0f\u4e8e\u5f00\u59cb\u7d22\u5f15\uff0c\u4f1a\u629b\u51fa\u5f02\u5e38<\/span>\r\n<\/code><\/pre>\n<p>\u5177\u4f53\u7684\u306a\u89e3\u6c7a\u7b56\u306f\u3001\u5177\u4f53\u7684\u306a\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3084\u30b3\u30fc\u30c9\u306b\u3088\u3063\u3066\u7570\u306a\u308b\u305f\u3081\u3001\u4e00\u822c\u7684\u306a\u6587\u5b57\u5217\u30a8\u30e9\u30fc\u3068\u89e3\u6c7a\u7b56\u3060\u3051\u3092\u3044\u304f\u3064\u304b\u793a\u3057\u307e\u3059\u3002\u554f\u984c\u304c\u767a\u751f\u3057\u305f\u5834\u5408\u306f\u3001\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u78ba\u8a8d\u3057\u3001\u30b3\u30fc\u30c9\u3092\u6ce8\u610f\u6df1\u304f\u78ba\u8a8d\u3057\u3066\u554f\u984c\u3092\u898b\u3064\u3051\u3001\u4fee\u6b63\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u3067String\u3092\u4f7f\u7528\u3059\u308b\u969b\u306b\u767a\u751f\u3059\u308b\u30a8\u30e9\u30fc\u306b\u306f\u8907\u6570\u306e\u539f\u56e0\u304c\u8003\u3048\u3089\u308c\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u4e00\u822c\u7684\u306a\u30a8\u30e9\u30fc\u3068\u89e3\u6c7a\u7b56\u3092\u307e\u3068\u3081\u3066\u3044\u307e\u3059\u3002 NullPointerException\uff08\u30cc\u30eb\u30dd\u30a4\u30f3\u30bf\u4f8b\u5916\uff09\uff1a\u7a7a\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u4e0a\u3067\u6587\u5b57\u5217\u30e1\u30bd [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-123062","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Java\u3067\u6587\u5b57\u5217\u30a8\u30e9\u30fc\u3092\u89e3\u6c7a\u3059\u308b\u65b9\u6cd5\u306f\uff1f - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/ja\/blog\/java\u3067\u6587\u5b57\u5217\u30a8\u30e9\u30fc\u3092\u89e3\u6c7a\u3059\u308b\u65b9\u6cd5\u306f\uff1f\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java\u3067\u6587\u5b57\u5217\u30a8\u30e9\u30fc\u3092\u89e3\u6c7a\u3059\u308b\u65b9\u6cd5\u306f\uff1f\" \/>\n<meta property=\"og:description\" content=\"Java\u3067String\u3092\u4f7f\u7528\u3059\u308b\u969b\u306b\u767a\u751f\u3059\u308b\u30a8\u30e9\u30fc\u306b\u306f\u8907\u6570\u306e\u539f\u56e0\u304c\u8003\u3048\u3089\u308c\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u4e00\u822c\u7684\u306a\u30a8\u30e9\u30fc\u3068\u89e3\u6c7a\u7b56\u3092\u307e\u3068\u3081\u3066\u3044\u307e\u3059\u3002 NullPointerException\uff08\u30cc\u30eb\u30dd\u30a4\u30f3\u30bf\u4f8b\u5916\uff09\uff1a\u7a7a\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u4e0a\u3067\u6587\u5b57\u5217\u30e1\u30bd [&hellip;]\" \/>\n<meta property=\"og:url\" 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