{"id":100963,"date":"2024-03-22T03:16:19","date_gmt":"2024-03-21T18:16:19","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%a7%e3%82%a8%e3%83%b3%e3%83%86%e3%82%a3%e3%83%86%e3%82%a3%e3%82%aa%e3%83%96%e3%82%b8%e3%82%a7%e3%82%af%e3%83%88%e3%81%ae%e3%83%97%e3%83%ad%e3%83%91%e3%83%86%e3%82%a3%e3%81%8c%e7%a9%ba\/"},"modified":"2024-04-05T09:45:05","modified_gmt":"2024-04-05T00:45:05","slug":"java%e3%81%a7%e3%82%a8%e3%83%b3%e3%83%86%e3%82%a3%e3%83%86%e3%82%a3%e3%82%aa%e3%83%96%e3%82%b8%e3%82%a7%e3%82%af%e3%83%88%e3%81%ae%e3%83%97%e3%83%ad%e3%83%91%e3%83%86%e3%82%a3%e3%81%8c%e7%a9%ba","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%a7%e3%82%a8%e3%83%b3%e3%83%86%e3%82%a3%e3%83%86%e3%82%a3%e3%82%aa%e3%83%96%e3%82%b8%e3%82%a7%e3%82%af%e3%83%88%e3%81%ae%e3%83%97%e3%83%ad%e3%83%91%e3%83%86%e3%82%a3%e3%81%8c%e7%a9%ba\/","title":{"rendered":"Java\u3067\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u7a7a\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3059\u308b\u65b9\u6cd5"},"content":{"rendered":"

Java\u306b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u304c\u30cc\u30eb\u304b\u3069\u3046\u304b\u3092\u8abf\u3079\u308b\u306b\u306f\u3001\u4e00\u822c\u7684\u306b\u6b21\u306e\u65b9\u6cd5\u304c\u53d6\u3089\u308c\u307e\u3059\u3002<\/p>\n

    \n
  1. if\u6587\u3067\u30d7\u30ed\u30d1\u30c6\u30a3\u304cnull\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n
    if<\/span> (entity.getProperty() == null<\/span>) {\r\n    \/\/ \u5c5e\u6027\u4e3a\u7a7a<\/span>\r\n} else<\/span> {\r\n    \/\/ \u5c5e\u6027\u4e0d\u4e3a\u7a7a<\/span>\r\n}\r\n<\/code><\/pre>\n
      \n
    1. StringUtils\u30af\u30e9\u30b9\u306eisEmpty\u30e1\u30bd\u30c3\u30c9\u3092\u5229\u7528\u3057\u3066\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u7a7a\u304b\u3069\u3046\u304b\u3092\u5224\u5b9a\u3059\u308b:<\/li>\n<\/ol>\n
      if<\/span> (StringUtils.isEmpty(entity.getProperty())) {\r\n    \/\/ \u5c5e\u6027\u4e3a\u7a7a<\/span>\r\n} else<\/span> {\r\n    \/\/ \u5c5e\u6027\u4e0d\u4e3a\u7a7a<\/span>\r\n}\r\n<\/code><\/pre>\n
      org.apache.commons.lang3.StringUtils\u30af\u30e9\u30b9\u3092\u30a4\u30f3\u30dd\u30fc\u30c8\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
        \n
      1. Objects.isNull\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u30d7\u30ed\u30d1\u30c6\u30a3\u304cnull\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3059\u308b\uff1a<\/li>\n<\/ol>\n
        if<\/span> (Objects.isNull(entity.getProperty())) {\r\n    \/\/ \u5c5e\u6027\u4e3anull<\/span>\r\n} else<\/span> {\r\n    \/\/ \u5c5e\u6027\u4e0d\u4e3anull<\/span>\r\n}\r\n<\/code><\/pre>\n
        java.util.Objects\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30dd\u30fc\u30c8\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n
          \n
        1. Optional\u30af\u30e9\u30b9\u306eisPresent\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u5b58\u5728\u3059\u308b\u304b\u5224\u5b9a\u3059\u308b\uff1a<\/li>\n<\/ol>\n
          Optional<String> optionalProperty = Optional.ofNullable(entity.getProperty());\r\nif<\/span> (optionalProperty.isPresent()) {\r\n    \/\/ \u5c5e\u6027\u5b58\u5728<\/span>\r\n} else<\/span> {\r\n    \/\/ \u5c5e\u6027\u4e0d\u5b58\u5728<\/span>\r\n}\r\n<\/code><\/pre>\n
          java.util.Optional\u30af\u30e9\u30b9\u3092\u30a4\u30f3\u30dd\u30fc\u30c8\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
          \u5b9f\u614b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5c5e\u6027\u304c\u7a7a\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u5224\u5b9a\u3059\u308b\u65b9\u6cd5\u3092\u3001\u5177\u4f53\u7684\u306a\u72b6\u6cc1\u306b\u5fdc\u3058\u3066\u9069\u5207\u306b\u9078\u629e\u3057\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
          Java\u306b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u304c\u30cc\u30eb\u304b\u3069\u3046\u304b\u3092\u8abf\u3079\u308b\u306b\u306f\u3001\u4e00\u822c\u7684\u306b\u6b21\u306e\u65b9\u6cd5\u304c\u53d6\u3089\u308c\u307e\u3059\u3002 if\u6587\u3067\u30d7\u30ed\u30d1\u30c6\u30a3\u304cnull\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3057\u307e\u3059\u3002 if (entity.getProperty() == null) { \/ […]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-100963","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nJava\u3067\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u7a7a\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3059\u308b\u65b9\u6cd5 - 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\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u7a7a\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java\u3067\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u7a7a\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3059\u308b\u65b9\u6cd5\" \/>\n<meta property=\"og:description\" content=\"Java\u306b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u304c\u30cc\u30eb\u304b\u3069\u3046\u304b\u3092\u8abf\u3079\u308b\u306b\u306f\u3001\u4e00\u822c\u7684\u306b\u6b21\u306e\u65b9\u6cd5\u304c\u53d6\u3089\u308c\u307e\u3059\u3002 if\u6587\u3067\u30d7\u30ed\u30d1\u30c6\u30a3\u304cnull\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3057\u307e\u3059\u3002 if (entity.getProperty() == null) { \/ […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/java\u3067\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u7a7a\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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