{"id":8752,"date":"2024-03-15T01:28:52","date_gmt":"2024-03-14T16:28:52","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/%e5%a4%89%e6%95%b0%e3%81%8c%e7%a9%ba%e3%81%8b%e3%81%a9%e3%81%86%e3%81%8b%e3%82%92java%e3%81%a7%e5%88%a4%e6%96%ad%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b\/"},"modified":"2025-08-03T21:53:01","modified_gmt":"2025-08-03T12:53:01","slug":"%e5%a4%89%e6%95%b0%e3%81%8c%e7%a9%ba%e3%81%8b%e3%81%a9%e3%81%86%e3%81%8b%e3%82%92java%e3%81%a7%e5%88%a4%e6%96%ad%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/%e5%a4%89%e6%95%b0%e3%81%8c%e7%a9%ba%e3%81%8b%e3%81%a9%e3%81%86%e3%81%8b%e3%82%92java%e3%81%a7%e5%88%a4%e6%96%ad%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b\/","title":{"rendered":"Java \u5909\u6570\u304c\u7a7a\u304b\u5224\u5b9a\u3059\u308b\u5b89\u5168\u306a\u65b9\u6cd5"},"content":{"rendered":"<p>Java\u3067\u5909\u6570\u304c\u7a7a\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3059\u308b\u65b9\u6cd5\u306f\u3044\u304f\u3064\u304b\u3042\u308a\u307e\u3059\u3002<\/p>\n<ol>\n<li>\u5909\u6570\u304cnull\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3059\u308b\u305f\u3081\u306bif\u6587\u3092\u4f7f\u7528\u3059\u308b\u3002<\/li>\n<\/ol>\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    System.out.println(<span class=\"hljs-string\">\"\u53d8\u91cf\u4e3a\u7a7a\"<\/span>);\r\n} <span class=\"hljs-keyword\">else<\/span> {\r\n    System.out.println(<span class=\"hljs-string\">\"\u53d8\u91cf\u4e0d\u4e3a\u7a7a\"<\/span>);\r\n}\r\n<\/code><\/pre>\n<ol>\n<li>Objects\u30af\u30e9\u30b9\u306eisNull()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u5909\u6570\u304cnull\u304b\u3069\u3046\u304b\u3092\u5224\u5b9a\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\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> (Objects.isNull(str)) {\r\n    System.out.println(<span class=\"hljs-string\">\"\u53d8\u91cf\u4e3a\u7a7a\"<\/span>);\r\n} <span class=\"hljs-keyword\">else<\/span> {\r\n    System.out.println(<span class=\"hljs-string\">\"\u53d8\u91cf\u4e0d\u4e3a\u7a7a\"<\/span>);\r\n}\r\n<\/code><\/pre>\n<ol>\n<li>StringUtils\u30af\u30e9\u30b9\u306eisEmpty()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u6587\u5b57\u5217\u5909\u6570\u304c\u7a7a\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\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\">\"\"<\/span>;\r\n<span class=\"hljs-keyword\">if<\/span> (StringUtils.isEmpty(str)) {\r\n    System.out.println(<span class=\"hljs-string\">\"\u53d8\u91cf\u4e3a\u7a7a\"<\/span>);\r\n} <span class=\"hljs-keyword\">else<\/span> {\r\n    System.out.println(<span class=\"hljs-string\">\"\u53d8\u91cf\u4e0d\u4e3a\u7a7a\"<\/span>);\r\n}\r\n<\/code><\/pre>\n<ol>\n<li>Optional\u30af\u30e9\u30b9\u306eisPresent()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001Optional\u5909\u6570\u304c\u7a7a\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code>Optional&lt;String&gt; optional = Optional.ofNullable(<span class=\"hljs-literal\">null<\/span>);\r\n<span class=\"hljs-keyword\">if<\/span> (!optional.isPresent()) {\r\n    System.out.println(<span class=\"hljs-string\">\"\u53d8\u91cf\u4e3a\u7a7a\"<\/span>);\r\n} <span class=\"hljs-keyword\">else<\/span> {\r\n    System.out.println(<span class=\"hljs-string\">\"\u53d8\u91cf\u4e0d\u4e3a\u7a7a\"<\/span>);\r\n}\r\n<\/code><\/pre>\n<p>\u3053\u308c\u3089\u306e\u65b9\u6cd5\u306f\u3001\u7570\u306a\u308b\u72b6\u6cc1\u306b\u5fdc\u3058\u3066\u5909\u6570\u304c\u7a7a\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3057\u3001\u9069\u5207\u306a\u51e6\u7406\u65b9\u6cd5\u3092\u53d6\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u3067\u5909\u6570\u304c\u7a7a\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3059\u308b\u65b9\u6cd5\u306f\u3044\u304f\u3064\u304b\u3042\u308a\u307e\u3059\u3002 \u5909\u6570\u304cnull\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3059\u308b\u305f\u3081\u306bif\u6587\u3092\u4f7f\u7528\u3059\u308b\u3002 String str = null; if (str == null) { System.out.p [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[2050,42,2776,957,1654],"class_list":["post-8752","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-isempty","tag-java","tag-null","tag-957","tag-1654"],"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 \u5909\u6570\u304c\u7a7a\u304b\u5224\u5b9a\u3059\u308b\u5b89\u5168\u306a\u65b9\u6cd5 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" 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\u5909\u6570\u304c\u7a7a\u304b\u5224\u5b9a\u3059\u308b\u5b89\u5168\u306a\u65b9\u6cd5\" \/>\n<meta property=\"og:description\" content=\"Java\u3067\u5909\u6570\u304c\u7a7a\uff08null\u307e\u305f\u306f\u7a7a\u6587\u5b57\u5217\uff09\u304b\u3069\u3046\u304b\u3092\u5b89\u5168\u304b\u3064\u52b9\u7387\u7684\u306b\u5224\u5b9a\u3059\u308b\u65b9\u6cd5\u3092\u89e3\u8aac\u3057\u307e\u3059\u3002null\u30c1\u30a7\u30c3\u30af\u3001isEmpty()\u30e1\u30bd\u30c3\u30c9\u3001StringUtils.isEmpty()\u306a\u3069\u3001\u72b6\u6cc1\u306b\u5fdc\u3058\u305f\u6700\u9069\u306a\u65b9\u6cd5\u3092\u7d39\u4ecb\u3002\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/\u5909\u6570\u304c\u7a7a\u304b\u3069\u3046\u304b\u3092java\u3067\u5224\u65ad\u3059\u308b\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-14T16:28:52+00:00\" \/>\n<meta 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