{"id":79213,"date":"2024-03-20T20:54:03","date_gmt":"2024-03-20T11:54:03","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/instanceof%e3%81%af%e3%82%aa%e3%83%96%e3%82%b8%e3%82%a7%e3%82%af%e3%83%88%e3%81%8c%e7%89%b9%e5%ae%9a%e3%81%ae%e3%82%af%e3%83%a9%e3%82%b9%e3%81%be%e3%81%9f%e3%81%af%e3%82%a4%e3%83%b3%e3%82%bf%e3%83%bc\/"},"modified":"2025-08-12T05:55:37","modified_gmt":"2025-08-11T20:55:37","slug":"instanceof%e3%81%af%e3%82%aa%e3%83%96%e3%82%b8%e3%82%a7%e3%82%af%e3%83%88%e3%81%8c%e7%89%b9%e5%ae%9a%e3%81%ae%e3%82%af%e3%83%a9%e3%82%b9%e3%81%be%e3%81%9f%e3%81%af%e3%82%a4%e3%83%b3%e3%82%bf%e3%83%bc","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/instanceof%e3%81%af%e3%82%aa%e3%83%96%e3%82%b8%e3%82%a7%e3%82%af%e3%83%88%e3%81%8c%e7%89%b9%e5%ae%9a%e3%81%ae%e3%82%af%e3%83%a9%e3%82%b9%e3%81%be%e3%81%9f%e3%81%af%e3%82%a4%e3%83%b3%e3%82%bf%e3%83%bc\/","title":{"rendered":"instanceof\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u7279\u5b9a\u306e\u30af\u30e9\u30b9\u307e\u305f\u306f\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002"},"content":{"rendered":"

Java \u306e\u6f14\u7b97\u5b50 instanceof \u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u7279\u5b9a\u306e\u578b\u307e\u305f\u306f\u305d\u306e\u30b5\u30d6\u30bf\u30a4\u30d7\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u8abf\u3079\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u3064\u307e\u308a\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u5225\u306e\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3067\u3042\u308b\u304b\u3001\u305d\u306e\u30b5\u30d6\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u5224\u5b9a\u3057\u307e\u3059\u3002<\/p>\n

instanceof\u306e\u69cb\u6587\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n

object instanceof type\r\n<\/code><\/pre>\n
\u3053\u3053\u3067\u3001object \u306f\u691c\u67fb\u5bfe\u8c61\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3042\u308a\u3001type\u306f\u691c\u67fb\u5bfe\u8c61\u306e\u7a2e\u985e\u307e\u305f\u306f\u30af\u30e9\u30b9\u3067\u3059\u3002<\/p>\n
\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9of\u306e\u6a5f\u80fd\u306b\u306f\u4ee5\u4e0b\u304c\u542b\u307e\u308c\u307e\u3059\u3002<\/p>\n
    \n
  1. \u578b\u306e\u691c\u67fb:\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u7279\u5b9a\u306e\u578b\u306b\u6240\u5c5e\u3057\u3066\u3044\u308b\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u306b\u306f\u3001instanceof\u3092\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001<\/li>\n
  2. if (obj instanceof String) { System.out.println(“obj \u306f\u6587\u5b57\u5217\u3067\u3059”); }<\/li>\n
  3. \u591a\u614b\u306e\u5224\u5b9a\uff1ainstanceof\u3092\u4f7f\u3063\u3066\u3001\u3042\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u81ea\u8eab\u306e\u89aa\u30af\u30e9\u30b9\u3084\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304b\u3069\u3046\u304b\u3092\u8abf\u3079\u3089\u308c\u307e\u3059\u3002\u305f\u3068\u3048\u3070\uff1a<\/li>\n
  4. if (obj instanceof Animal) {
    \nSystem.out.println(“obj\u306fAnimal\u30af\u30e9\u30b9\u3067\u3059\u3002”);
    \n}<\/li>\n
  5. \u591a\u614b\u6027\u306b\u5bfe\u5fdc\u3059\u308b\u305f\u3081\u306e\u624b\u6bb5\u3068\u3057\u3066\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u7a2e\u985e\u306b\u3088\u3063\u3066\u7570\u306a\u308b\u51e6\u7406\u3092\u5b9f\u884c\u3059\u308b\u5834\u5408\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/li>\n<\/ol>\n
    instanceof\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5b9f\u884c\u6642\u578b\u3092\u8abf\u3079\u307e\u3059\u3002\u305d\u3046\u3067\u306a\u3044\u5ba3\u8a00\u578b\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u305d\u306e\u578b\u306e\u30b5\u30d6\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u5834\u5408\u306f\u3001\u305d\u308c\u3067\u3082true\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
    Java \u306e\u6f14\u7b97\u5b50 instanceof \u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u7279\u5b9a\u306e\u578b\u307e\u305f\u306f\u305d\u306e\u30b5\u30d6\u30bf\u30a4\u30d7\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u8abf\u3079\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u3064\u307e\u308a\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u5225\u306e\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3067\u3042\u308b\u304b\u3001\u305d\u306e\u30b5\u30d6\u30af\u30e9\u30b9\u306e\u30a4\u30f3 […]<\/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-79213","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"\ninstanceof\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u7279\u5b9a\u306e\u30af\u30e9\u30b9\u307e\u305f\u306f\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"instanceof\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u7279\u5b9a\u306e\u30af\u30e9\u30b9\u307e\u305f\u306f\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\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\/instanceof\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u7279\u5b9a\u306e\u30af\u30e9\u30b9\u307e\u305f\u306f\u30a4\u30f3\u30bf\u30fc\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"instanceof\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u7279\u5b9a\u306e\u30af\u30e9\u30b9\u307e\u305f\u306f\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\" \/>\n<meta property=\"og:description\" content=\"instanceof\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u7279\u5b9a\u306e\u30af\u30e9\u30b9\u307e\u305f\u306f\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\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\/instanceof\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u7279\u5b9a\u306e\u30af\u30e9\u30b9\u307e\u305f\u306f\u30a4\u30f3\u30bf\u30fc\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-20T11:54:03+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-08-11T20:55:37+00:00\" \/>\n<meta name=\"author\" content=\"\u967d, \u5411\u5b87\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u57f7\u7b46\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u967d, \u5411\u5b87\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u63a8\u5b9a\u8aad\u307f\u53d6\u308a\u6642\u9593\" \/>\n\t<meta name=\"twitter:data2\" content=\"2\u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/ja\/blog\/instanceof%e3%81%af%e3%82%aa%e3%83%96%e3%82%b8%e3%82%a7%e3%82%af%e3%83%88%e3%81%8c%e7%89%b9%e5%ae%9a%e3%81%ae%e3%82%af%e3%83%a9%e3%82%b9%e3%81%be%e3%81%9f%e3%81%af%e3%82%a4%e3%83%b3%e3%82%bf%e3%83%bc\/\",\"url\":\"https:\/\/www.silicloud.com\/ja\/blog\/instanceof%e3%81%af%e3%82%aa%e3%83%96%e3%82%b8%e3%82%a7%e3%82%af%e3%83%88%e3%81%8c%e7%89%b9%e5%ae%9a%e3%81%ae%e3%82%af%e3%83%a9%e3%82%b9%e3%81%be%e3%81%9f%e3%81%af%e3%82%a4%e3%83%b3%e3%82%bf%e3%83%bc\/\",\"name\":\"instanceof\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u7279\u5b9a\u306e\u30af\u30e9\u30b9\u307e\u305f\u306f\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002 - 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