{"id":16566,"date":"2024-03-16T04:28:22","date_gmt":"2024-03-15T19:28:22","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%a7%e3%81%af%e3%80%81%e3%82%aa%e3%83%96%e3%82%b8%e3%82%a7%e3%82%af%e3%83%88%e3%81%8cnull%e3%81%8b%e3%81%a9%e3%81%86%e3%81%8b%e3%82%92%e5%88%a4%e6%96%ad%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95\/"},"modified":"2025-08-06T07:47:42","modified_gmt":"2025-08-05T22:47:42","slug":"java%e3%81%a7%e3%81%af%e3%80%81%e3%82%aa%e3%83%96%e3%82%b8%e3%82%a7%e3%82%af%e3%83%88%e3%81%8cnull%e3%81%8b%e3%81%a9%e3%81%86%e3%81%8b%e3%82%92%e5%88%a4%e6%96%ad%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%a7%e3%81%af%e3%80%81%e3%82%aa%e3%83%96%e3%82%b8%e3%82%a7%e3%82%af%e3%83%88%e3%81%8cnull%e3%81%8b%e3%81%a9%e3%81%86%e3%81%8b%e3%82%92%e5%88%a4%e6%96%ad%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95\/","title":{"rendered":"Java\u3067\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304cnull\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3059\u308b\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1f"},"content":{"rendered":"

Java\u3067\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u7a7a\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3059\u308b\u65b9\u6cd5\u306f\u6b21\u306e\u901a\u308a\u3067\u3059\uff1a<\/p>\n

    \n
  1. null\u306e\u4f7f\u7528\u3092\u78ba\u8a8d\uff1a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068null\u3092\u6bd4\u8f03\u3059\u308b\u969b\u306b”==”\u6f14\u7b97\u5b50\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304cnull\u3068\u7b49\u3057\u3044\u5834\u5408\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u7a7a\u3067\u3059\u3002<\/li>\n<\/ol>\n
    if<\/span> (object == null<\/span>) {\r\n    \/\/ \u5bf9\u8c61\u4e3a\u7a7a<\/span>\r\n}\r\n<\/code><\/pre>\n
      \n
    1. \u4e00\u90e8\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5bfe\u3057\u3066isEmpty()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u7a7a\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001List\u3001Set\u3001Map\u306a\u3069\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5bfe\u3057\u3066isEmpty()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002<\/li>\n<\/ol>\n
      List<String> list = new<\/span> ArrayList<\/span><>();\r\nif<\/span> (list.isEmpty()) {\r\n    \/\/ \u5bf9\u8c61\u4e3a\u7a7a<\/span>\r\n}\r\n<\/code><\/pre>\n
        \n
      1. \u914d\u5217\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u95a2\u3057\u3066\u3001length\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u4f7f\u7528\u3057\u3066\u914d\u5217\u304c\u7a7a\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u914d\u5217\u306e\u9577\u3055\u304c0\u306e\u5834\u5408\u306f\u3001\u914d\u5217\u304c\u7a7a\u3067\u3042\u308b\u3053\u3068\u3092\u793a\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n
        int<\/span>[] array = new<\/span> int<\/span>[0<\/span>];\r\nif<\/span> (array.length == 0<\/span>) {\r\n    \/\/ \u5bf9\u8c61\u4e3a\u7a7a<\/span>\r\n}\r\n<\/code><\/pre>\n
        \u4e0a\u8a18\u306e\u65b9\u6cd5\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u7a7a\u304b\u3069\u3046\u304b\u3092\u5224\u5225\u3059\u308b\u3060\u3051\u3067\u3042\u308a\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u5185\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u7a7a\u304b\u3069\u3046\u304b\u3092\u5224\u5225\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u5185\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u7a7a\u304b\u3069\u3046\u304b\u3092\u5224\u5225\u3059\u308b\u306b\u306f\u3001\u9069\u5207\u306a\u30ed\u30b8\u30c3\u30af\u3092\u81ea\u5206\u3067\u4f5c\u6210\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
        Java\u3067\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u7a7a\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3059\u308b\u65b9\u6cd5\u306f\u6b21\u306e\u901a\u308a\u3067\u3059\uff1a null\u306e\u4f7f\u7528\u3092\u78ba\u8a8d\uff1a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068null\u3092\u6bd4\u8f03\u3059\u308b\u969b\u306b”==”\u6f14\u7b97\u5b50\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304cnull\u3068\u7b49\u3057\u3044\u5834\u5408\u3001\u30aa\u30d6\u30b8 […]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-16566","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"\nJava\u3067\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304cnull\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3059\u308b\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1f - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Java\u3067\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304cnull\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3059\u308b\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1f\u3092\u5206\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3002\u5b9f\u8df5\u7684\u306a\u4f8b\u3068\u30b3\u30fc\u30c9\u3001\u6ce8\u610f\u70b9\u3092\u542b\u3081\u3066\u521d\u5fc3\u8005\u306b\u3082\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u8aac\u660e\u3057\u307e\u3059\u3002\" \/>\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\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304cnull\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3059\u308b\u65b9\u6cd5\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java\u3067\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304cnull\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3059\u308b\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1f\" \/>\n<meta property=\"og:description\" content=\"Java\u3067\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304cnull\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3059\u308b\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1f\u3092\u5206\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3002\u5b9f\u8df5\u7684\u306a\u4f8b\u3068\u30b3\u30fc\u30c9\u3001\u6ce8\u610f\u70b9\u3092\u542b\u3081\u3066\u521d\u5fc3\u8005\u306b\u3082\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u8aac\u660e\u3057\u307e\u3059\u3002\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/java\u3067\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304cnull\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3059\u308b\u65b9\u6cd5\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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