{"id":1308,"date":"2019-01-23T15:00:46","date_gmt":"2019-01-23T06:00:46","guid":{"rendered":"https:\/\/www.bold.ne.jp\/engineer-club\/?p=1308"},"modified":"2025-10-06T16:48:41","modified_gmt":"2025-10-06T07:48:41","slug":"java-instanceof","status":"publish","type":"post","link":"https:\/\/www.bold.ne.jp\/engineer-club\/java-instanceof","title":{"rendered":"Java\u306einstanceof\u3068\u306f\uff1f\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u5b9f\u4f53\u3092\u5224\u65ad\u3059\u308binstanceof\u306e\u69cb\u6587\u3084\u4f7f\u3044\u65b9"},"content":{"rendered":"<p>Java\u306e\u6f14\u7b97\u5b50<span>instanceof<\/span>\u3092\u4f7f\u3046\u3068\u3001\u5909\u6570\u304c\u6307\u3059\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u4f55\u306e\u30af\u30e9\u30b9\u304b\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n<p>instanceof\u306f\u4f7f\u3063\u305f\u3053\u3068\u304c\u306a\u3044\u4eba\u3082\u591a\u3044\u3067\u3057\u3087\u3046\u3002\u5909\u6570\u306e\u578b\u3092\u898b\u308c\u3070\u4f55\u306e\u30af\u30e9\u30b9\u306f\u3059\u3050\u306b\u308f\u304b\u308a\u307e\u3059\u3057\u3001\u305d\u306e\u3088\u3046\u306a\u5224\u65ad\u3092\u3059\u308b\u610f\u5473\u306f\u306a\u3055\u305d\u3046\u306b\u3082\u898b\u3048\u307e\u3059\u3002<\/p>\n<p>\u3067\u3082\u3001<span>Java<\/span>\u306f\u30af\u30e9\u30b9\u306e\u7d99\u627f\u304c\u4f7f\u3048\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3060\u304b\u3089\u3053\u305d\u3001<span>instanceof<\/span>\u306e\u3088\u3046\u306a\u6a5f\u80fd\u304c\u5fc5\u8981\u306a\u306e\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001<strong>\u305d\u3093\u306ainstanceof\u306b\u3064\u3044\u3066\u3001\u4f7f\u3044\u65b9\u3084\u6d3b\u7528\u65b9\u6cd5\u3092\u521d\u5fc3\u8005\u5411\u3051\u306b<\/strong>\u304a\u4f1d\u3048\u3057\u307e\u3059\u3002<\/p>\n<p>\u203b\u3053\u306e\u8a18\u4e8b\u306e\u30b5\u30f3\u30d7\u30eb\u306f\u3001<span>Java 10<\/span>\u306e\u74b0\u5883\u3067\u52d5\u4f5c\u78ba\u8a8d\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<div id=\"toc_container\" class=\"no_bullets\"><p class=\"toc_title\">\u76ee\u6b21<\/p><ul class=\"toc_list\"><li><a href=\"#Javainstanceof\">\uff11\uff0e\u3010Java\u3011instanceof\u306f\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u5b9f\u4f53\u3092\u5224\u65ad\u3059\u308b<\/a><ul><li><a href=\"#-instanceof\">\uff11-\uff11\uff0einstanceof\u306e\u69cb\u6587<\/a><\/li><li><a href=\"#-instanceof-2\">\uff11-\uff12\uff0einstanceof\u306e\u4f8b<\/a><\/li><\/ul><\/li><li><a href=\"#Javainstanceof-2\">\uff12\uff0e\u3010Java\u3011instanceof\u306e\u610f\u5473\u306e\u3042\u308b\u4f7f\u3044\u65b9<\/a><ul><li><a href=\"#-Integer\">\uff12-\uff11\uff0eInteger\u306e\u7d99\u627f\u95a2\u4fc2\u3068\u5b9f\u88c5\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306e\u304a\u3055\u3089\u3044<\/a><\/li><li><a href=\"#i\">\uff12-\uff12\uff0e\u30b5\u30d6\u30af\u30e9\u30b9\u3092\u77e5\u308b<\/a><\/li><li><a href=\"#i-2\">\uff12-\uff13\uff0e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306e\u5b9f\u88c5\u30af\u30e9\u30b9\u3092\u77e5\u308b<\/a><\/li><li><a href=\"#i-3\">\uff12-\uff14\uff0e\u30af\u30e9\u30b9\u304c\u5b9f\u88c5\u3057\u3066\u3044\u308b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3092\u77e5\u308b<\/a><\/li><li><a href=\"#-Object\">\uff12-\uff15\uff0eObject\u306e\u5b9f\u4f53\u3092\u77e5\u308b<\/a><\/li><\/ul><\/li><li><a href=\"#Javainstanceof-3\">\uff13\uff0e\u3010Java\u3011instanceof\u306e\u3044\u308d\u3044\u308d<\/a><ul><li><a href=\"#-instanceof-3\">\uff13-\uff11\uff0einstanceof\u3068\u30ad\u30e3\u30b9\u30c8<\/a><\/li><li><a href=\"#-instanceof-4\">\uff13-\uff12\uff0einstanceof\u3067\u5426\u5b9a\u3059\u308b\u5834\u5408<\/a><\/li><li><a href=\"#-instanceofswitch\">\uff13-\uff13\uff0einstanceof\u3068switch<\/a><\/li><li><a href=\"#-instanceof-5\">\uff13-\uff14\uff0einstanceof\u3068\u914d\u5217<\/a><\/li><li><a href=\"#-instanceof-6\">\uff13-\uff15\uff0einstanceof\u3068\u30b8\u30a7\u30cd\u30ea\u30af\u30b9<\/a><\/li><li><a href=\"#-null\">\uff13-\uff16\uff0enull\u306f\u3069\u3093\u306a\u30af\u30e9\u30b9\u3067\u3082\u306a\u3044<\/a><\/li><li><a href=\"#-instanceof-7\">\uff13-\uff17\uff0einstanceof\u304c\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u306a\u308b\u30b1\u30fc\u30b9<\/a><\/li><\/ul><\/li><li><a href=\"#ClassisInstanceisAssignableFrom\">\uff14\uff0e\u3010\u53c2\u8003\u3011Class.isInstance\/isAssignableFrom\u3067\u306e\u52d5\u7684\u5224\u65ad<\/a><ul><li><a href=\"#-ClassisInstanceinstanceof\">\uff14-\uff11\uff0eClass.isInstance\u3067\u52d5\u7684\u306binstanceof\u3059\u308b<\/a><\/li><li><a href=\"#-ClassisAssignableFrom\">\uff14-\uff12\uff0eClass.isAssignableFrom\u3067\u30af\u30e9\u30b9\u540c\u58eb\u306e\u30ad\u30e3\u30b9\u30c8\u53ef\u5426\u3092\u5224\u65ad<\/a><\/li><\/ul><\/li><li><a href=\"#i-4\">\uff15\uff0e\u307e\u3068\u3081<\/a><\/li><\/ul><\/div>\n<h2><span id=\"Javainstanceof\">\uff11\uff0e\u3010Java\u3011instanceof\u306f\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u5b9f\u4f53\u3092\u5224\u65ad\u3059\u308b<\/span><\/h2>\n<h3><span id=\"-instanceof\">\uff11-\uff11\uff0einstanceof\u306e\u69cb\u6587<\/span><\/h3>\n<p>\u6f14\u7b97\u5b50<span>instanceof<\/span>\u3092\u4f7f\u3046\u3068\u3001\u5909\u6570\u304c\u6307\u3059\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u3001\u6307\u5b9a\u3057\u305f\u30af\u30e9\u30b9\u30fb\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u304b\u5224\u65ad\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>instanceof\u306e\u69cb\u6587\u306f\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">\u5909\u6570\u540d instanceof \u30af\u30e9\u30b9\u540d<\/pre>\n<p>instanceof\u306e\u623b\u308a\u5024\u306f<span>boolean<\/span>\u306a\u306e\u3067\u3001<span>true<\/span>\u306a\u3089\u6307\u5b9a\u3057\u305f\u30af\u30e9\u30b9\u3084\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3067\u3042\u308b\u3001<span>false<\/span>\u306a\u3089\u305d\u3046\u3067\u306f\u306a\u3044\u3001\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002<\/p>\n<h3><span id=\"-instanceof-2\">\uff11-\uff12\uff0einstanceof\u306e\u4f8b<\/span><\/h3>\n<p>\u3067\u306f\u3001\u3055\u3063\u305d\u304f<span>instanceof<\/span>\u3092\u4f7f\u3063\u3066\u307f\u307e\u3059\u3002<\/p>\n<p>\u4f8b\u3068\u3057\u3066\u3001<span>Java<\/span>\u3067\u6574\u6570\u3092\u30af\u30e9\u30b9\u3068\u3057\u3066\u6271\u3046\u6642\u306b\u51fa\u3066\u304f\u308b\u3001<span>java.lang.Integer<\/span>\u3092\u4f7f\u3063\u3066\u307f\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">Integer i = Integer.valueOf(1);\r\n\r\nboolean iof = i instanceof Integer;\r\nSystem.out.println(iof); \/\/ \u2192 true<\/pre>\n<p>\u307e\u3042\u3001\u305d\u308a\u3083\u3042\u305d\u3046\u306a\u308b\u3088\u306d\u3001\u3068\u3044\u3046\u7d50\u679c\u3067\u3059\u3002\u578b\u304c<span>Integer<\/span>\u306e\u5909\u6570\u306b\u300c\u3042\u306a\u305f\u306f<span>Integer<\/span>\u3067\u3059\u304b\u300d\u3068\u805e\u3044\u305f\u3089\u3001<span>true<\/span>\u3068\u3057\u304b\u306a\u3089\u306a\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n<p>\u3053\u308c\u3060\u3051\u3060\u3068\u3001<span>instanceof<\/span>\u304c\u4f55\u306e\u305f\u3081\u306b\u3042\u308b\u306e\u304b\u5206\u304b\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>instanceof\u306f\u3001\u9759\u7684\u578b\u4ed8\u3051\u304c\u7279\u5fb4\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3067\u3042\u308b<span>Java<\/span>\u306e\u3001\u300c\u9759\u7684\u300d\u3068\u3044\u3046\u5236\u9650\u3092\u304b\u3044\u304f\u3050\u3063\u305f\u308a\u3001\u30af\u30e9\u30b9\u306e\u7d99\u627f\u95a2\u4fc2\u3092\u6b63\u3057\u304f\u628a\u63e1\u3059\u308b\u305f\u3081\u306b\u4f7f\u3046\u3082\u306e\u3067\u3059\u3002<\/p>\n<p>\u305d\u306e\u4f8b\u3092\u3001\u6b21\u306e\u7ae0\u3067\u304a\u4f1d\u3048\u3057\u307e\u3059\u3002<\/p>\n<h2><span id=\"Javainstanceof-2\">\uff12\uff0e\u3010Java\u3011instanceof\u306e\u610f\u5473\u306e\u3042\u308b\u4f7f\u3044\u65b9<\/span><\/h2>\n<h3><span id=\"-Integer\">\uff12-\uff11\uff0eInteger\u306e\u7d99\u627f\u95a2\u4fc2\u3068\u5b9f\u88c5\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306e\u304a\u3055\u3089\u3044<\/span><\/h3>\n<p>\u3053\u306e\u7ae0\u3067\u306f<span>Integer<\/span>\u3092\u4f8b\u306b\u4f7f\u3044\u307e\u3059\u306e\u3067\u3001<span>Integer<\/span>\u306e\u30af\u30e9\u30b9\u306e\u7d99\u627f\u95a2\u4fc2\u3068\u5b9f\u88c5\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3092\u304a\u3055\u3089\u3044\u3057\u307e\u3059\u3002<\/p>\n<p>Integer\u306f\u4ee5\u4e0b\u306e\u7d99\u627f\u95a2\u4fc2\u306b\u3042\u308b\u306e\u306f\u3054\u5b58\u77e5\u3060\u3068\u601d\u3044\u307e\u3059\u3002Integer\u3068\u540c\u3058\u6df1\u3055\u306e\u7d99\u627f\u306e\u968e\u5c64\u306b\u3001<span>Long<\/span>\u3084<span>Double<\/span>\u306a\u3069\u306e\u4ed6\u306e\u6570\u5024\u3092\u8868\u3059\u30af\u30e9\u30b9\u304c\u3044\u304f\u3064\u304b\u3042\u308a\u307e\u3059\u3088\u306d\u3002<\/p>\n<blockquote>\n<p>java.lang.Object<\/p>\n<p>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2517java.lang.Number<\/p>\n<p>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2517java.lang.Integer<\/p>\n<p>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2517java.lang.Long<\/p>\n<p>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2517java.lang.Double<\/p>\n<\/blockquote>\n<p>\u3055\u3089\u306b\u3001Integer\u306fjava.lang.Comparable\u3068\u3001java.io.Serializable\u3092\u5b9f\u88c5\u3057\u305f\u30af\u30e9\u30b9\u3067\u3059\u3002<\/p>\n<p>\u3067\u3059\u306e\u3067Integer\u306f\u3001Integer\/Object\/Number\/Comparable\/Serializable\u306e\u3001\u5168\u90e8\u30675\u3064\u306e\u9854\u3092\u6301\u3063\u305f\u30af\u30e9\u30b9\u3060\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002<\/p>\n<h3><span id=\"i\">\uff12-\uff12\uff0e\u30b5\u30d6\u30af\u30e9\u30b9\u3092\u77e5\u308b<\/span><\/h3>\n<p>instanceof\u306e\u4f7f\u3044\u9053\u306e\u4e00\u3064\u306f\u3001\u5909\u6570\u306e\u578b\u306b\u7d99\u627f\u95a2\u4fc2\u304c\u3042\u308b\u6642\u306b\u3001\u5b9f\u969b\u306f\u3069\u306e\u30b5\u30d6\u30af\u30e9\u30b9\u306a\u306e\u304b\u77e5\u308b\u3053\u3068\u3067\u3059\u3002<\/p>\n<p>\u3053\u3053\u3067\u300c<span>Integer<\/span>\u306f<span>Number<\/span>\u3067\u3042\u308b\u300d\u3068\u8a00\u3048\u307e\u3059\u3002Integer\u306b\u306f\u5148\u306b\u8ff0\u3079\u305f\u30af\u30e9\u30b9\u306e\u7d99\u627f\u95a2\u4fc2\u304c\u3042\u308b\u304b\u3089\u3067\u3059\u3002\u3053\u308c\u306f\u82f1\u8a9e\u3060\u3068\u300cInteger is a Number\u300d\u3068\u66f8\u3051\u3066\u3001\u3053\u3046\u3044\u3046\u95a2\u4fc2\u3092\u300cIS-A\u95a2\u4fc2\u300d\u3068\u3082\u547c\u3073\u307e\u3059\u3002<\/p>\n<p>\u9006\u306b\u300c<span>Number<\/span>\u306f<span>Integer<\/span>\u3067\u3042\u308b<span>(Number is a Integer)<\/span>\u300d\u3068\u306f<span>100%<\/span>\u8a00\u3044\u5207\u308c\u307e\u305b\u3093\u3002\u306a\u305c\u304b\u3068\u3044\u3046\u3068\u3001<span>Number<\/span>\u304c\u6307\u3059\u5909\u6570\u306e\u5148\u306b\u3042\u308b\u306e\u306f\u3001<span>Long<\/span>\u3084<span>Double<\/span>\u304b\u3082\u3057\u308c\u306a\u3044\u304b\u3089\u3067\u3059\u3002<\/p>\n<p>\u3053\u308c\u3089\u3092\u982d\u306b\u5165\u308c\u3066\u3082\u3089\u3063\u305f\u4e0a\u3067\u3001\u4ee5\u4e0b\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u8aad\u3093\u3067\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">Number n1 = Integer.valueOf(1);\r\nNumber n2 = Long.valueOf(1);\r\nNumber n3 = Double.valueOf(1);\r\n\r\nSystem.out.println(n1 instanceof Integer); \/\/ \u2192 true\u3001Number\u306e\u5b9f\u4f53\u306fInteger!!\r\nSystem.out.println(n2 instanceof Integer); \/\/ \u2192 false\u3001Number\u306e\u5b9f\u4f53\u306fIntege\u3067\u306f\u306a\u3044(Long)\r\nSystem.out.println(n3 instanceof Integer); \/\/ \u2192 false\u3001Number\u306e\u5b9f\u4f53\u306fIntege\u3067\u306f\u306a\u3044(Double)<\/pre>\n<p>\u5909\u6570\u306e\u578b\u306f\u5168\u90e8<span>Number<\/span>\u3067\u3059\u3002\u305d\u3057\u3066\u3001\u5b9f\u4f53\u306f<span>Integer\/Long\/Double<\/span>\u306a\u306e\u3067\u5168\u90e8\u9055\u3044\u307e\u3059\u3002\u3067\u3059\u304b\u3089\u3001\u5168\u3066<span>Number<\/span>\u3068\u3057\u3066\u6271\u3048\u3066\u3044\u307e\u3059\u304c\u3001\u5b9f\u4f53\u304c\u4f55\u3067\u3042\u308b\u304b\u306f\u5909\u6570\u306e\u578b\u304b\u3089\u306f\u5206\u304b\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u3053\u306e\u3088\u3046\u306b\u3001\u5909\u6570\u304c\u6307\u3059\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u672c\u5f53\u306e\u30af\u30e9\u30b9\u304c\u4f55\u3067\u3042\u308b\u304b\u3092\u77e5\u308b\u305f\u3081\u306b\u3001<span>instanceof<\/span>\u3092\u4f7f\u3046\u306e\u3067\u3059\u3002<\/p>\n<p>\u3061\u306a\u307f\u306b\u3001<span>instanceof<\/span>\u3067\u306f\u30b9\u30fc\u30d1\u30fc\u30af\u30e9\u30b9\u306e\u78ba\u8a8d\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">Integer i = Integer.valueOf(1);\r\n\r\nSystem.out.println(i instanceof Number); \/\/ \u2192 true\u3060\u3051\u308c\u3069\u3001\u3053\u308c\u306f\u5f53\u305f\u308a\u524d\r\nSystem.out.println(i instanceof Object); \/\/ \u2192 true\u306b\u306a\u308b\u306e\u3082\u5f53\u305f\u308a\u524d<\/pre>\n<p>\u3053\u308c\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u306f\u306a\u308a\u307e\u305b\u3093\u304c\u3001\u3046\u308c\u3057\u3044\u3053\u3068\u3082\u5927\u3057\u3066\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u30af\u30e9\u30b9\u306e\u7d99\u627f\u95a2\u4fc2\u4e0a\u3067\u3001<span>Integer<\/span>\u306f<span>Number<\/span>\u3084<span>Object<\/span>\u3060\u3068\u3001\u6700\u521d\u304b\u3089\u5206\u304b\u308a\u5207\u3063\u3066\u3044\u308b\u304b\u3089\u3067\u3059\u3002<\/p>\n<h3><span id=\"i-2\">\uff12-\uff13\uff0e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306e\u5b9f\u88c5\u30af\u30e9\u30b9\u3092\u77e5\u308b<\/span><\/h3>\n<p>instanceof\u306f\u3001\u578b\u304c\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306e\u5834\u5408\u3001\u305d\u306e\u5b9f\u88c5\u30af\u30e9\u30b9\u304c\u4f55\u304b\u3092\u8abf\u3079\u308b\u6642\u306b\u3082\u4f7f\u3044\u307e\u3059\u3002<\/p>\n<p>Comparable\u306f\u3001<span>Java<\/span>\u306e\u4e2d\u3067\u3082\u4e00\u756a\u3068\u3044\u3063\u3066\u3044\u3044\u304f\u3089\u3044\u5e83\u304f\u5b9f\u88c5\u3055\u308c\u3066\u3044\u308b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3067\u3059\u3002Integer\u306fComparable\u3092\u5b9f\u88c5\u3057\u3066\u3044\u308b\u306e\u3067\u3001\u300cInteger\u306fComparable\u3067\u3042\u308b\u300d\u3068\u8a00\u3048\u307e\u3059\u3088\u306d\u3002\u7686\u3055\u3093\u304c\u3088\u304f\u4f7f\u3046String\u3082Comparable\u3092\u5b9f\u88c5\u3057\u3066\u3044\u308b\u306e\u3067\u3001\u300cString\u306fComparable\u3067\u3042\u308b\u300d\u3068\u3082\u8a00\u3048\u307e\u3059\u3002<\/p>\n<p>\u3067\u3059\u304b\u3089\u3001<span>Number<\/span>\u3082<span>String<\/span>\u3082\u3001<span>Comparable<\/span>\u3068\u3044\u3046\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3068\u3057\u3066\u540c\u4e00\u8996\u3067\u304d\u307e\u3059\u3002Comparable\u306a\u5909\u6570\u304c\u6307\u3059\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u30af\u30e9\u30b9\u306f\u3001\u5168\u304f\u7570\u306a\u308b\u3082\u306e\u3067\u3042\u308a\u5f97\u308b\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002<\/p>\n<p>\u3053\u3046\u3044\u3046\u3084\u3084\u3053\u3057\u3044\u72b6\u6cc1\u3092\u3001<span>instanceof<\/span>\u3092\u4f7f\u3048\u3070\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u5224\u65ad\u3067\u304d\u308b\u306e\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">Comparable c1 = Integer.valueOf(1);\r\nComparable c2 = \"String\";\r\n\r\nSystem.out.println(c1 instanceof Number); \/\/ \u2192 true\r\nSystem.out.println(c1 instanceof String); \/\/ \u2192 false\r\n\r\nSystem.out.println(c2 instanceof Number); \/\/ \u2192 false\r\nSystem.out.println(c2 instanceof String); \/\/ \u2192 true<\/pre>\n<p>\u3064\u307e\u308a\u3001\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306e\u578b\u3092\u4f7f\u3046\u3053\u3068\u3067\u898b\u3048\u306a\u304f\u306a\u3063\u3066\u3044\u308b\u3001\u5909\u6570\u306e\u5148\u306b\u3042\u308b\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u5b9f\u4f53\u30af\u30e9\u30b9\u304c\u4f55\u3067\u3042\u308b\u304b\u3001\u5224\u65ad\u3067\u304d\u3066\u3044\u307e\u3059\u3002<\/p>\n<h3><span id=\"i-3\">\uff12-\uff14\uff0e\u30af\u30e9\u30b9\u304c\u5b9f\u88c5\u3057\u3066\u3044\u308b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3092\u77e5\u308b<\/span><\/h3>\n<p>\u3055\u3089\u306b<span>instanceof<\/span>\u3067\u306f\u3001\u578b\u304c\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306e\u5834\u5408\u306b\u9650\u308a\u3001\u305d\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306e\u5b9f\u4f53\u30af\u30e9\u30b9\u304c\u3001\u5225\u306e\u3069\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3092\u5b9f\u88c5\u3057\u3066\u3044\u308b\u306e\u304b\u3092\u8abf\u3079\u3089\u308c\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">Comparable c = Integer.valueOf(1);\r\n\r\nSystem.out.println(c instanceof Serializable); \/\/ \u2192 true\r\nSystem.out.println(c instanceof AutoCloseable); \/\/ \u2192 false<\/pre>\n<p>Integer\u306f\u524d\u8ff0\u306e\u3068\u304a\u308a\u3001Comparable\u306e\u4ed6\u306b\u3001java.io.Serializable\u3082\u5b9f\u88c5\u3057\u3066\u3044\u307e\u3059\u3002\u3067\u3082\u3001<span>java.lang.AutoCloseable<\/span>\u306f\u5b9f\u88c5\u3057\u3066\u3044\u307e\u305b\u3093\u3002<\/p>\n<p>AutoCloseable\u306f<span>Comparable<\/span>\u3068\u306f\u7d99\u627f\u95a2\u4fc2\u306b\u306a\u3044\u3001\u4ed6\u4eba\u3068\u3082\u8a00\u3048\u308b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3067\u3059\u3002\u3067\u3082\u3001<span>Comparable<\/span>\u306a\u5909\u6570\u306e\u5148\u306b\u3042\u308b\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306f\u3001<span>AutoCloseable<\/span>\u3092\u5b9f\u88c5\u3057\u3066\u3044\u308b\u304b\u3082\u77e5\u308c\u307e\u305b\u3093\u3088\u306d\u3002<\/p>\n<p>\u3064\u307e\u308a\u3001\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u304c\u578b\u3067\u3042\u308b\u5909\u6570\u306f\u3001\u305d\u306e\u5909\u6570\u306e\u5148\u306b\u3042\u308b\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u3069\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3092\u5b9f\u88c5\u3057\u3066\u3044\u308b\u304b\u308f\u304b\u3089\u306a\u3044\u306e\u3067\u3059\u3002<\/p>\n<p>\u305d\u3093\u306a\u6642\u306b<span>instanceof<\/span>\u3092\u4f7f\u3048\u3070\u3001\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u304c\u3069\u306e\u5225\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3092\u5b9f\u88c5\u3057\u3066\u3044\u308b\u304b\u5224\u65ad\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3><span id=\"-Object\">\uff12-\uff15\uff0eObject\u306e\u5b9f\u4f53\u3092\u77e5\u308b<\/span><\/h3>\n<p>\u5909\u6570\u306e\u578b\u304c<span>Object<\/span>\u3067\u3042\u308b\u5834\u5408\u306f\u3001\u3042\u308b\u610f\u5473\u3067\u7279\u5225\u306a\u30b1\u30fc\u30b9\u3060\u3068\u8a00\u3048\u307e\u3059\u3002Object\u306f\u5168\u3066\u306e\u30af\u30e9\u30b9\u306e\u30b9\u30fc\u30d1\u30fc\u30af\u30e9\u30b9\u306a\u306e\u3067\u3001\u5909\u6570\u304c\u6307\u3059\u5b9f\u4f53\u306f\u3001\u5168\u3066\u306e\u30af\u30e9\u30b9\u30fb\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306e\u3069\u308c\u3067\u3082\u3042\u308a\u3046\u308b\u304b\u3089\u3067\u3059\u3002<\/p>\n<p>\u3067\u3059\u304b\u3089\u3001<span>Object<\/span>\u3092\u578b\u3068\u3059\u308b\u5909\u6570\u306f\u3001\u3069\u306e\u30af\u30e9\u30b9\u3084\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3068\u3082<span>instanceof<\/span>\u3067\u78ba\u8a8d\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">Object o = Integer.valueOf(1);\r\n\r\nSystem.out.println(o instanceof Object); \/\/ \u2192 true\r\nSystem.out.println(o instanceof Number); \/\/ \u2192 true\r\nSystem.out.println(o instanceof Integer); \/\/ \u2192 true\r\nSystem.out.println(o instanceof Long); \/\/ \u2192 false\r\nSystem.out.println(o instanceof Double); \/\/ \u2192 false\r\nSystem.out.println(o instanceof String); \/\/ \u2192 false\r\nSystem.out.println(o instanceof Serializable); \/\/ \u2192 true\r\nSystem.out.println(o instanceof Comparable); \/\/ \u2192 true\r\nSystem.out.println(o instanceof AutoCloseable); \/\/ \u2192 false<\/pre>\n<h2><span id=\"Javainstanceof-3\">\uff13\uff0e\u3010Java\u3011instanceof\u306e\u3044\u308d\u3044\u308d<\/span><\/h2>\n<h3><span id=\"-instanceof-3\">\uff13-\uff11\uff0einstanceof\u3068\u30ad\u30e3\u30b9\u30c8<\/span><\/h3>\n<p>instanceof\u3068\u307b\u3068\u3093\u3069\u30bb\u30c3\u30c8\u306b\u306a\u308b\u306e\u304c\u3001\u5909\u6570\u3092\u5225\u306e\u578b\u3078\u30ad\u30e3\u30b9\u30c8\u3059\u308b\u3053\u3068\u3067\u3059\u3002\u30ad\u30e3\u30b9\u30c8\u3057\u3066\u5927\u4e08\u592b\u304b\u3069\u3046\u304b\u3092<span>instanceof<\/span>\u3067\u78ba\u8a8d\u3092\u3057\u3066\u3001\u5b9f\u884c\u6642\u30a8\u30e9\u30fc\u3092\u51fa\u3055\u306a\u3044\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u3082\u306e\u304c\u3088\u304f\u898b\u3089\u308c\u308b\u3082\u306e\u3067\u3059\u306d\u3002if\u6587\u3067\u30c1\u30a7\u30c3\u30af\u3057\u306a\u3044\u3068<span>ClassCastException<\/span>\u304c\u767a\u751f\u3057\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u9014\u4e2d\u3067\u6b62\u307e\u3063\u3066\u3057\u307e\u3046\u304b\u3082\u3057\u308c\u306a\u3044\u304b\u3089\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">Object o = Integer.valueOf(1);\r\nInteger i = null;\r\nString s = null;\r\n\r\nif (o instanceof Integer) {\r\n\ti = (Integer)o;\r\n} else if (o instanceof String) {\r\n\ts = (String)o;\r\n}<\/pre>\n<p>\u306a\u304a\u3001\u3053\u306e\u4f8b\u3067\u306f\u5909\u6570\u306e\u578b\u3068\u3057\u3066<span>Object<\/span>\u3092\u4f7f\u3044\u307e\u3057\u305f\u304c\u3001\u30af\u30e9\u30b9\u3092\u5bfe\u8c61\u306b\u3057\u305f\u5834\u5408\u3067\u3001\u30c0\u30a6\u30f3\u30ad\u30e3\u30b9\u30c8<span>(<\/span>\u30b5\u30d6\u30af\u30e9\u30b9\u3078\u306e\u30ad\u30e3\u30b9\u30c8<span>)<\/span>\u304c\u3067\u304d\u308b\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3059\u308b\u306e\u306b\u3082\u4f7f\u3044\u307e\u3059\u3002<\/p>\n<h4>\uff13-\uff11-\uff11\uff0eObject\u578b\u5909\u6570\u306e\u529f\u7f6a<\/h4>\n<p>\u4f8b\u3048\u3070\u3001\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u4e0a\u3067\u306f<span>Object<\/span>\u578b\u306e\u5909\u6570\u3092\u6271\u3046\u3053\u3068\u3067\u3001\u4e8b\u5b9f\u4e0a\u3069\u3093\u306a\u30af\u30e9\u30b9\u30fb\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3067\u3082\u6271\u3048\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u3067\u3059\u304c\u3001\u6271\u3063\u3066\u3044\u308b\u3082\u306e\u304c\u3069\u306e\u30af\u30e9\u30b9\u304b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3067\u3042\u308b\u304b\u78ba\u8a8d\u3057\u305f\u3044\u3053\u3068\u3082\u3082\u3061\u308d\u3093\u3042\u308a\u3001\u305d\u3053\u304c<span>instanceof<\/span>\u306e\u51fa\u756a\u3067\u3059\u3002<\/p>\n<p>\u3053\u308c\u304c\u9855\u8457\u3060\u3063\u305f\u306e\u304c\u3001\u4f8b\u3048\u3070<span>Java 1.4<\/span>\u4ee5\u524d\u306e<span>Collection<\/span>\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3067\u3059\u3002List\u3084<span>Set<\/span>\u306f<span>Object<\/span>\u3092\u683c\u7d0d\u3057\u3001<span>Map<\/span>\u306f<span>Object<\/span>\u3092\u30ad\u30fc\u3068\u3057<span>Object<\/span>\u3092\u5024\u3068\u3057\u3066\u3044\u307e\u3057\u305f\u3002\u3067\u3059\u304b\u3089\u3001\u3069\u3093\u306a\u30af\u30e9\u30b9\u3067\u3082\u6271\u3048\u308b\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3067\u306f\u3042\u308a\u307e\u3057\u305f\u304c\u3001\u4f7f\u3046\u6642\u306f\u5fc5\u305a\u30ad\u30e3\u30b9\u30c8\u3092\u5f37\u3044\u3089\u308c\u305f\u306e\u3067\u3059\u3002<\/p>\n<p>Java 1.5\u3067\u306e\u30b8\u30a7\u30cd\u30ea\u30af\u30b9<span>(Generics<\/span>\u3001\u578b\u5f15\u6570<span>)<\/span>\u306e\u5c0e\u5165\u3067<span>instanceof<\/span>\u304c\u539f\u5247\u4e0d\u8981\u306b\u306a\u3063\u305f\u306e\u3067\u3001<span>Collection<\/span>\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306f\u5927\u5909\u4f7f\u3044\u3084\u3059\u304f\u3001\u304b\u3064\u5b89\u5168\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n<p>\u3067\u3082\u3001\u307e\u3060<span>Object<\/span>\u3092\u4f7f\u3063\u3066\u3044\u308b\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306f\u3042\u308a\u307e\u3059\u3057\u3001\u5225\u306e\u7528\u9014\u3082\u3042\u308a\u307e\u3059\u306e\u3067\u3001<span>instanceof<\/span>\u3092\u4f7f\u3046\u3053\u3068\u306f\u306a\u304f\u306a\u3089\u306a\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n<h3><span id=\"-instanceof-4\">\uff13-\uff12\uff0einstanceof\u3067\u5426\u5b9a\u3059\u308b\u5834\u5408<\/span><\/h3>\n<p>instanceof\u3067\u300c\u3053\u308c\u306f\uff5e\u3067\u3042\u308b\u300d\u304c\u5206\u304b\u308a\u307e\u3059\u304c\u3001\u9006\u306e\u300c\u3053\u308c\u306f\uff5e\u3067\u306f\u306a\u3044\u300d\u306f\u76f4\u63a5\u306f\u5206\u304b\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u3067\u3059\u306e\u3067\u3001<span>instanceof<\/span>\u306e\u7d50\u679c\u3092\u5426\u5b9a\u3057\u305f\u3044\u306a\u3089\u3001\u5426\u5b9a\u6f14\u7b97\u5b50<span>!<\/span>\u3092\u300c<span>!(instanceof<\/span>\u306e\u7d50\u679c<span>)<\/span>\u300d\u306e\u5f62\u3067\u4f7f\u3044\u307e\u3059\u3002\u3061\u306a\u307f\u306b\u300c<span>X !instanceof Y<\/span>\u300d\u3068\u3044\u3046\u5f62\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u306e\u3067\u6ce8\u610f\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">Object o = Integer.valueOf(1);\r\n\r\nif (!(o instanceof Integer)) {\r\n\tSystem.out.println(\"Integer\u3067\u306f\u3042\u308a\u307e\u305b\u3093\");\r\n} else if (!(o instanceof String)) {\r\n\tSystem.out.println(\"String\u3067\u306f\u3042\u308a\u307e\u305b\u3093\");\r\n}<\/pre>\n<h3><span id=\"-instanceofswitch\">\uff13-\uff13\uff0einstanceof\u3068switch<\/span><\/h3>\n<p>instanceof\u3092\u4f7f\u3063\u3066\u3044\u308b\u3068\u3001if-else\u304c\u4ed8\u304d\u7269\u3067\u3059\u3002if\u306e\u6761\u4ef6\u306b\u3044\u3061\u3044\u3061<span>instanceof<\/span>\u3092\u66f8\u304f\u306e\u306f\u9762\u5012\u306a\u306e\u3067\u3001<span>switch<\/span>\u3067\u3059\u3063\u304d\u308a\u66f8\u3051\u306a\u3044\u304b\u306a<span>\u2026<\/span>\u3068\u8ab0\u3057\u3082\u8003\u3048\u307e\u3059\u3002<\/p>\n<p>\u3067\u3059\u304c\u3001\u6b8b\u5ff5\u306a\u304c\u3089<span>switch<\/span>\u306f<span>Class<\/span>\u3092\u5024\u306b\u4f7f\u3048\u306a\u3044\u306e\u3067\u3001\u4ee5\u4e0b\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">Object o = Integer.valueOf(1);\r\n\r\nswitch (o.class) {\r\ncase Integer:\r\n\t\/\/ o\u3092Integer\u306b\u30ad\u30e3\u30b9\u30c8\u3057\u3066\u4f55\u304b\u3059\u308b\r\n\tbreak;\r\ncase String:\r\n\t\/\/ o\u3092String\u306b\u30ad\u30e3\u30b9\u30c8\u3057\u3066\u4f55\u304b\u3059\u308b\r\n\tbreak;\r\ndefalult:\r\n\tbreak;\r\n}<\/pre>\n<p>\u3082\u3057\u304b\u3059\u308b\u3068\u3001\u5f8c\u8ff0\u3059\u308bClass.isInstance\u3084isAssignableFrom\u3092\u4f7f\u3046\u3068\u3001\u591a\u5c11\u306f\u4e0a\u624b\u304f\u66f8\u3051\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002\u3067\u3059\u304c\u5b9f\u969b\u306f\u3001<span>if<\/span>\u6587\u3068<span>instanceof<\/span>\u3067\u7d20\u76f4\u306b\u66f8\u3044\u305f\u65b9\u304c\u65e9\u3044\u3067\u3059\u3057\u3001\u30c8\u30e9\u30d6\u30eb\u3084\u8a66\u884c\u932f\u8aa4\u3082\u5c11\u306a\u304f\u3066\u6e08\u3080\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<p>\u5c06\u6765\u306e<span>Java<\/span>\u3067\u4f55\u304b\u3057\u3089\u306e\u4ed5\u69d8\u304c\u8ffd\u52a0\u3055\u308c\u308b\u3053\u3068\u3082\u3042\u307e\u308a\u671f\u5f85\u306f\u3067\u304d\u306a\u3055\u305d\u3046\u3067\u3059\u304c\u3001\u305f\u304f\u3055\u3093\u9023\u7d9a\u3059\u308b<span>if<\/span>\u6587\u3092\u898b\u308b\u3068\u3001\u4f55\u304b\u306e\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u3084<span>Enum<\/span>\u3092\u4f7f\u3063\u3066\u304d\u308c\u3044\u306b\u66f8\u3051\u306a\u3044\u304b\u306a<span>\u2026<\/span>\u3068\u8003\u3048\u305f\u304f\u306a\u308b\u306e\u306f\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n<h3><span id=\"-instanceof-5\">\uff13-\uff14\uff0einstanceof\u3068\u914d\u5217<\/span><\/h3>\n<p>instanceof\u3067\u306f\u3001\u5909\u6570\u304c\u6307\u3059\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u3001\u4f55\u304b\u306e\u30af\u30e9\u30b9\u30fb\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306e\u914d\u5217\u304b\u3069\u3046\u304b\u3082\u8abf\u3079\u3089\u308c\u307e\u3059\u3002\u914d\u5217\u304b\u3069\u3046\u304b\u3092\u8abf\u3079\u308b\u306b\u306f\u3001<span>instanceof<\/span>\u306e\u53f3\u8fba\u5024\u3092\u914d\u5217\u578b\u3068\u3059\u308b\u3060\u3051\u3067\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u306e\u4f8b\u3067\u3001\u914d\u5217\u3068\u305d\u3046\u3067\u306a\u3044\u3082\u306e\u3082<span>instanceof<\/span>\u3067\u533a\u5225\u3055\u308c\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u308b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">Object obj = new String[] { \"A\", \"B\", \"C\" }; \/\/ \u2460\r\nObject[] objArr = new Integer[] { Integer.valueOf(1), Integer.valueOf(2), Integer.valueOf(3) }; \/\/ \u2461\r\n\r\nSystem.out.println(obj instanceof String[]); \/\/ true\r\nSystem.out.println(obj instanceof String); \/\/ false\r\n\r\nSystem.out.println(objArr instanceof Integer[]); \/\/ true\r\nSystem.out.println(objArr instanceof Number[]); \/\/ true\r\nSystem.out.println(objArr instanceof Long[]); \/\/ false\r\n\/\/ System.out.println(objArr instanceof Integer); \/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc!!<\/pre>\n<p>\u3053\u306e\u4f8b\u3067\u306f<span>\u2460<\/span>\u306e\u90e8\u5206\u3001\u3059\u306a\u308f\u3061\u914d\u5217\u3092<span>Object<\/span>\u578b\u3067\u5ba3\u8a00\u3057\u305f\u5909\u6570\u306b\u4ee3\u5165\u3057\u3066\u3044\u308b\u306e\u306f\u3001\u3042\u307e\u308a\u898b\u306a\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<p>Java\u306e\u914d\u5217\u306f\u53c2\u7167\u578b\u306e\u5024\u3067\u3059\u3002\u914d\u5217\u306f\u300c\u914d\u5217\u578b\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u300d\u3068\u3067\u3082\u8868\u73fe\u3059\u3079\u304d\u3082\u306e\u3067\u3042\u308a\u3001\u3069\u3093\u306a\u578b\u3067\u3082\u53d6\u308a\u5f97\u308b<span>Object<\/span>\u306b\u305d\u306e\u307e\u307e\u4ee3\u5165\u3067\u304d\u308b\u306e\u3067\u3059\u3002\u3067\u3059\u306e\u3067\u3001<span>Object<\/span>\u304c\u914d\u5217\u304b\u3069\u3046\u304b\u3092\u8abf\u3079\u3066\u3044\u308b\u3053\u306e\u4f8b\u306f\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u306f\u306a\u308a\u307e\u305b\u3093\u3002<\/p>\n<h3><span id=\"-instanceof-6\">\uff13-\uff15\uff0einstanceof\u3068\u30b8\u30a7\u30cd\u30ea\u30af\u30b9<\/span><\/h3>\n<p>instanceof\u306e\u53f3\u8fba\u5024\u306f\u3001\u30af\u30e9\u30b9\u540d\u3092\u76f4\u63a5\u66f8\u304b\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u306e\u3067\u3001\u30b8\u30a7\u30cd\u30ea\u30af\u30b9\u3067\u306e\u578b\u5f15\u6570\u306f\u4f7f\u3048\u307e\u305b\u3093\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306f\u3067\u304d\u305a\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">class InstanceofGenerics&lt;T&gt; {\r\n\tvoid instanceofTest(Object o) {\r\n\t\tSystem.out.println(o instanceof T); \/\/ instanceof\u3067\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc!!\r\n\t}\r\n}<\/pre>\n<p>\u306a\u305c\u304b\u3068\u3044\u3046\u3068\u3001\u3053\u306e\u4f8b\u3067\u8a00\u3046\u578b\u5f15\u6570\u306e<span>T<\/span>\u304c\u3001\u3053\u306e\u30af\u30e9\u30b9\u306e\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u306f\u4f55\u3067\u3042\u308b\u304b\u308f\u304b\u3089\u306a\u3044\u304b\u3089\u3067\u3059\u3002\u30b8\u30a7\u30cd\u30ea\u30af\u30b9\u306e\u578b\u5f15\u6570\u304c\u6307\u3059\u30af\u30e9\u30b9\u306f\u3001\u5b9f\u306f\u30af\u30e9\u30b9\u30d5\u30a1\u30a4\u30eb\u306e\u5185\u90e8\u7684\u306b\u306f\u5168\u3066<span>Object<\/span>\u6271\u3044\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u305d\u306e\u305f\u3081\u300c<span>o instanceof Object<\/span>\u300d\u3068\u306a\u308b\u306e\u3067\u3059\u304c\u3001\u3053\u308c\u306f<span>null<\/span>\u4ee5\u5916\u306a\u3089\u5e38\u306b<span>true<\/span>\u3068\u306a\u308a\u3001\u4e8b\u5b9f\u4e0a\u4f55\u306e\u610f\u5473\u3082\u306a\u3044\u3069\u3053\u308d\u304b\u30d0\u30b0\u3068\u3082\u8003\u3048\u3089\u308c\u304b\u306d\u306a\u3044\u306e\u3067\u3001\u660e\u793a\u7684\u306b\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u3057\u3066\u3044\u308b\u306e\u3060\u3068\u601d\u308f\u308c\u307e\u3059\u3002<\/p>\n<h3><span id=\"-null\">\uff13-\uff16\uff0enull\u306f\u3069\u3093\u306a\u30af\u30e9\u30b9\u3067\u3082\u306a\u3044<\/span><\/h3>\n<p>\u5909\u6570\u304c\u6307\u3059\u306e\u304c<span>null<\/span>\u306a\u3089<span>instanceof<\/span>\u306e\u7d50\u679c\u306f\u5fc5\u305a<span>false<\/span>\u3067\u3059\u3002\u4f8b\u3048\u3069\u3093\u306a\u30af\u30e9\u30b9\u30fb\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3092\u6307\u5b9a\u3057\u3066\u3082\u3067\u3059\u3002<\/p>\n<p>\u3053\u308c\u306f\u3001<span>instanceof<\/span>\u306f\u5909\u6570\u306e\u578b\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3082\u306e\u3067\u306f\u306a\u304f\u3001\u5909\u6570\u304c\u6307\u3057\u3066\u3044\u308b\u5148\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3082\u306e\u3060\u304b\u3089\u3067\u3059\u3002null\u306a\u3089\u5b9f\u969b\u306e\u30af\u30e9\u30b9\u3059\u3089\u308f\u304b\u3089\u306a\u3044\u306e\u3067\u3059\u304b\u3089\u3001\u30c1\u30a7\u30c3\u30af\u306e\u3057\u3088\u3046\u304c\u306a\u3044\u3067\u3059\u3088\u306d\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">Number n = null;\r\n\r\nif (n instanceof Integer) {\r\n\tSystem.out.println(\"Integer\u3067\u3059\");\r\n} else {\r\n\tSystem.out.println(\"Integer\u3067\u306f\u3042\u308a\u307e\u305b\u3093\"); \/\/ if\u6587\u3067\u306e\u5224\u5b9a\u7d50\u679c\u306f\u3053\u3061\u3089\u306b\u306a\u308b\r\n}<\/pre>\n<h3><span id=\"-instanceof-7\">\uff13-\uff17\uff0einstanceof\u304c\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u306a\u308b\u30b1\u30fc\u30b9<\/span><\/h3>\n<p>instanceof\u3067\u306f\u3001\u30af\u30e9\u30b9\u3084\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306e\u7d99\u627f\u95a2\u4fc2\u4e0a\u3067\u660e\u3089\u304b\u306b\u5b9f\u884c\u7d50\u679c\u304c<span>false<\/span>\u306b\u306a\u308b\u30b1\u30fc\u30b9\u306f\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u3069\u3046\u3057\u3066\u3082<span>instanceof<\/span>\u306e\u3068\u3053\u308d\u3067\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u306a\u3063\u3066\u3057\u307e\u3046\u306a\u3089\u3001\u30af\u30e9\u30b9\u3084\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306e\u7d99\u627f\u95a2\u4fc2\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001<span>Integer<\/span>\u3068<span>String<\/span>\u306f\u30af\u30e9\u30b9\u306e\u7d99\u627f\u95a2\u4fc2\u4e0a\u3067\u5171\u901a\u3057\u3066\u3044\u308b\u306e\u306f\u3001<span>Object<\/span>\u3067\u3042\u308b\u3053\u3068\u3060\u3051\u3067\u3059\u3002\u3067\u3059\u306e\u3067\u3001\u4ee5\u4e0b\u306e<span>Integer<\/span>\u304c<span>String<\/span>\u304b\u78ba\u8a8d\u3057\u3066\u3044\u308b\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\u3001<span>instanceof<\/span>\u3067\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>Integer\u306f<span>String<\/span>\u3067\u306f\u306a\u3044\u3053\u3068\u304c\u3001<span>Java<\/span>\u306e\u30b3\u30f3\u30d1\u30a4\u30e9\u306b\u306f\u660e\u3089\u304b\u3060\u304b\u3089\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">Integer i = Integer.valueOf(1);\r\nSystem.out.println(i instanceof String);<\/pre>\n<p>\u62bd\u8c61\u30af\u30e9\u30b9\u3084\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306f\u3001\u305d\u308c\u304c\u6700\u7d42\u7684\u306b\u3069\u306e\u3088\u3046\u306b\u5b9f\u88c5\u3055\u308c\u308b\u304b\u308f\u304b\u3089\u306a\u3044\u3082\u306e\u306a\u306e\u3067\u3001<span>instanceof<\/span>\u3067\u306e\u5236\u9650\u304c\u7de9\u3044\u306e\u3060\u3068\u8a00\u3048\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n<h2><span id=\"ClassisInstanceisAssignableFrom\">\uff14\uff0e\u3010\u53c2\u8003\u3011Class.isInstance\/isAssignableFrom\u3067\u306e\u52d5\u7684\u5224\u65ad<\/span><\/h2>\n<p>instanceof\u306fJava\u306e\u7d44\u307f\u8fbc\u307f\u69cb\u6587\u3067\u3059\u3002instanceof\u3092\u4f7f\u3046\u6642\u306f\u53f3\u8fba\u5024\u306b\u30af\u30e9\u30b9\u540d\u3092\u66f8\u304f\u306e\u3067\u3001\u30af\u30e9\u30b9\u540d\u3092\u77e5\u3089\u306a\u3051\u308c\u3070\u4f7f\u3048\u306a\u3044\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002<\/p>\n<p>\u3067\u3082\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u3063\u3066\u3044\u308b\u3068\u3001\u30af\u30e9\u30b9\u540d\u304c\u5206\u304b\u3089\u306a\u304f\u3066\u3082\u5b9f\u969b\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u4f55\u304b\u5224\u65ad\u3057\u305f\u3044\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u306f\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306a\u3069\u306e\u5b9f\u969b\u306e\u30af\u30e9\u30b9\u540d\u304c\u5206\u304b\u3089\u306a\u3044\u30b1\u30fc\u30b9\u3067\u3088\u304f\u51fa\u3066\u304d\u307e\u3059\u3002<\/p>\n<h3><span id=\"-ClassisInstanceinstanceof\">\uff14-\uff11\uff0eClass.isInstance\u3067\u52d5\u7684\u306b<span>instanceof<\/span>\u3059\u308b<\/span><\/h3>\n<p>Class.isInstance\u3092\u4f7f\u3046\u3068\u3001\u4f55\u306e\u30af\u30e9\u30b9\u30fb\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3067\u3042\u308b\u304b\u304c\u52d5\u7684\u306b\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n<p>isInstance\u306f\u30e1\u30bd\u30c3\u30c9\u306a\u306e\u3067\u3001<span>instanceof<\/span>\u3067\u306e\u53f3\u8fba\u5024\u3068\u306a\u308b\u30af\u30e9\u30b9\u540d\u3092\u3001\u5f15\u6570\u3067\u52d5\u7684\u306b\u6307\u5b9a\u3067\u304d\u308b\u306e\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">public boolean isInstance(Object obj)\r\n\u30d1\u30e9\u30e1\u30fc\u30bf:\r\n\tobj - \u30c1\u30a7\u30c3\u30af\u5bfe\u8c61\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\r\n\u623b\u308a\u5024:\r\n\tobj\u304c\u3053\u306e\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u5834\u5408\u306ftrue<\/pre>\n<pre class=\"prettyprint lang:default decode:true\">\/\/ \u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u3067\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3068\u30af\u30e9\u30b9\u3092\u53d7\u3051\u53d6\u308a\u3001\u52d5\u7684\u306b\u5224\u65ad\u3059\u308b\r\nclass IsInstanceTest {\r\n\tstatic void isInstance(Object o, Class clazz) {\r\n\t\tSystem.out.println(clazz.isInstance(o));\r\n\t}\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tisInstance(Integer.valueOf(1), Integer.class); \/\/ \u2192 true\r\n\t\tisInstance(Integer.valueOf(1), Number.class); \/\/ \u2192 true\r\n\t\tisInstance(Integer.valueOf(1), Long.class); \/\/ \u2192 false\r\n\t\tisInstance(Integer.valueOf(1), String.class); \/\/ \u2192 false\r\n\t\tisInstance(Integer.valueOf(1), Comparable.class); \/\/ \u2192 true\r\n\t\tisInstance(Integer.valueOf(1), AutoCloseable.class); \/\/ \u2192 false\r\n\t\tisInstance(null, Integer.class); \/\/ \u2192 false\r\n\t}\r\n}<\/pre>\n<p>\u306a\u304a\u3001<span>Class.isInstance<\/span>\u306f\u3001<span>instanceof<\/span>\u3068\u306f\u69cb\u6587\u4e0a\u306e\u4e3b\u5ba2\u304c\u9006\u306a\u306e\u306b\u6ce8\u610f\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>instanceof\u306f\u3001\u5909\u6570\u304c\u6307\u3059\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u4e0e\u3048\u3089\u308c\u305f\u30af\u30e9\u30b9\u30fb\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u304b\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n<p>Class.isInstance\u306f\u3001\u30af\u30e9\u30b9\u30fb\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306b\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u81ea\u5206\u81ea\u8eab\u304b\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n<h3><span id=\"-ClassisAssignableFrom\">\uff14-\uff12\uff0eClass.isAssignableFrom\u3067\u30af\u30e9\u30b9\u540c\u58eb\u306e\u30ad\u30e3\u30b9\u30c8\u53ef\u5426\u3092\u5224\u65ad<\/span><\/h3>\n<p>isInstance\u3068\u4f3c\u305f\u3088\u3046\u306a\u3082\u306e\u3067<span>Class.isAssignableFrom<\/span>\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u4f55\u306e\u30af\u30e9\u30b9\u304b\u8abf\u3079\u308b\u3082\u306e\u3067\u306f\u306a\u304f\u3001\u30af\u30e9\u30b9\u540c\u58eb\u3067<span>instanceof<\/span>\u7684\u306a\u6bd4\u8f03\u3092\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">public boolean isAssignableFrom(Class&lt;?&gt; cls)\r\n\u30d1\u30e9\u30e1\u30fc\u30bf:\r\n\tcls - \u30c1\u30a7\u30c3\u30af\u5bfe\u8c61\u306eClass\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\r\n\u623b\u308a\u5024:\r\n\tcls\u578b\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u3053\u306e\u30af\u30e9\u30b9\u306b\u5272\u308a\u5f53\u3066\u3089\u308c\u308b\u304b\u3069\u3046\u304b\u3092\u793a\u3059boolean\u5024<\/pre>\n<pre class=\"prettyprint lang:default decode:true\">\/\/ \u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\r\nClass clazz1 = Number.class;\r\nClass clazz2 = Integer.class;\r\n\r\nSystem.out.println(clazz1.isAssignableFrom(clazz2)); \/\/ \u2192 true (=Integer\u306fNumber\u3067\u3042\u308b)\r\nSystem.out.println(clazz2.isAssignableFrom(clazz1)); \/\/ \u2192 false (=Number\u306fInteger\u3067\u306f\u306a\u3044)<\/pre>\n<pre class=\"prettyprint lang:default decode:true\">\/\/ \u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u3067\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3068\u30af\u30e9\u30b9\u3092\u53d7\u3051\u53d6\u308a\u3001\u52d5\u7684\u306b\u5224\u65ad\u3059\u308b\r\nclass IsAssignableFromTest {\r\n\tstatic void isAssignableFrom(Class classTo, Class classFrom) {\r\n\t\tSystem.out.println(classTo.isAssignableFrom(classFrom));\r\n\t}\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tisAssignableFrom(Integer.class, Integer.class); \/\/ \u2192 true\r\n\t\tisAssignableFrom(Number.class, Integer.class); \/\/ \u2192 true\r\n\t\tisAssignableFrom(Long.class, Integer.class); \/\/ \u2192 false\r\n\t\tisAssignableFrom(Comparable.class, Integer.class); \/\/ \u2192 true\r\n\t\tisAssignableFrom(AutoCloseable.class, Integer.class); \/\/ \u2192 false\r\n\t\tisAssignableFrom(String.class, Integer.class); \/\/ \u2192 false\r\n\t}\r\n}<\/pre>\n<p>\u3053\u3053\u3067\u3001\u516c\u5f0f<span>Javadoc<\/span>\u306e\u300c\u5272\u308a\u5f53\u3066\u3089\u308c\u308b\u304b\u3069\u3046\u304b\u300d\u3068\u3044\u3046\u8868\u73fe\u306f\u3001\u5c11\u3057\u610f\u5473\u304c\u53d6\u308a\u3065\u3089\u3044\u3067\u3059\u3002isAssignableFrom\u306e\u5f15\u6570\u306b\u306a\u3063\u305f\u30af\u30e9\u30b9\u304c\u3001\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u884c\u3057\u305f\u30af\u30e9\u30b9\u306b\u30ad\u30e3\u30b9\u30c8\u3067\u304d\u308b\u304b\u3060\u3068\u8003\u3048\u308b\u3068\u3001\u5c11\u3057\u306f\u5206\u304b\u308a\u3084\u3059\u3044\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<p>isAssignableFrom\u306f\u3001<span>instanceof<\/span>\u3068\u306f\u4f7f\u3044\u9053\u304c\u53b3\u5bc6\u306b\u306f\u9055\u3044\u307e\u3059\u306e\u3067\u6ce8\u610f\u3057\u307e\u3057\u3087\u3046\u3002\u3067\u3082\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u306a\u3044\u72b6\u614b\u3067\u3001\u30af\u30e9\u30b9\u9593\u3067\u306e\u78ba\u8a8d\u304c\u3067\u304d\u308b\u306e\u306f\u4fbf\u5229\u306a\u3068\u3053\u308d\u3067\u3059\u306d\u3002<\/p>\n<h2><span id=\"i-4\">\uff15\uff0e\u307e\u3068\u3081<\/span><\/h2>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u5b9f\u4f53\u304c\u4f55\u304b\u3092\u8abf\u3079\u308b\u6f14\u7b97\u5b50\u3001<span>instanceof<\/span>\u306e\u4f7f\u3044\u65b9\u3092\u304a\u4f1d\u3048\u3057\u3066\u304d\u307e\u3057\u305f\u3002<\/p>\n<p>\u306a\u305c\u3053\u3046\u3044\u3046\u6f14\u7b97\u5b50\u304c\u3042\u308b\u304b\u3002\u305d\u308c\u306f<span>Java<\/span>\u304c\u9759\u7684\u578b\u4ed8\u3051\u304c\u7279\u5fb4\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3060\u304b\u3089\u3067\u3059\u3002<\/p>\n<p>\u30af\u30e9\u30b9\u306e\u7d99\u627f\u3084\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306e\u5b9f\u88c5\u306b\u3088\u3063\u3066\u3001\u5909\u6570\u306e\u578b\u306f\u62bd\u8c61\u7684\u306a\u30af\u30e9\u30b9\u30fb\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306b\u306a\u308a\u3048\u307e\u3059\u3002\u305d\u306e\u5909\u6570\u304c\u6307\u3059\u5148\u306e\u5b9f\u4f53\u304c\u4f55\u304b\u3001\u30d7\u30ed\u30b0\u30e9\u30de\u306f\u8abf\u3079\u308b\u5fc5\u8981\u304c\u3042\u308b\u304b\u3089\u3067\u3059\u3002<\/p>\n<p>\u4eca\u306e<span>Java<\/span>\u3067\u666e\u901a\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u3063\u3066\u3044\u308b\u306a\u3089\u3001<span>instanceof<\/span>\u306f\u3042\u307e\u308a\u4f7f\u308f\u306a\u3044\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002\u3067\u3059\u304c\u3001<span>instanceof<\/span>\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u306b\u306f\u6b20\u304b\u305b\u306a\u3044\u3082\u306e\u3060\u3068\u306f\u899a\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u306e\u6f14\u7b97\u5b50instanceof\u3092\u4f7f\u3046\u3068\u3001\u5909\u6570\u304c\u6307\u3059\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u4f55\u306e\u30af\u30e9\u30b9\u304b\u304c\u308f\u304b\u308a\u307e\u3059\u3002 instanceof\u306f\u4f7f\u3063\u305f\u3053\u3068\u304c\u306a\u3044\u4eba\u3082\u591a\u3044\u3067\u3057\u3087\u3046\u3002\u5909\u6570\u306e\u578b\u3092\u898b\u308c\u3070\u4f55\u306e\u30af\u30e9\u30b9\u306f\u3059\u3050\u306b\u308f\u304b\u308a\u307e\u3059\u3057\u3001\u305d\u306e\u3088\u3046\u306a\u5224\u65ad\u3092\u3059 [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":804,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[14],"acf":[],"_links":{"self":[{"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/posts\/1308"}],"collection":[{"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/comments?post=1308"}],"version-history":[{"count":7,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/posts\/1308\/revisions"}],"predecessor-version":[{"id":1311,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/posts\/1308\/revisions\/1311"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/media\/804"}],"wp:attachment":[{"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/media?parent=1308"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/categories?post=1308"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}