{"id":789,"date":"2018-10-20T12:00:11","date_gmt":"2018-10-20T03:00:11","guid":{"rendered":"https:\/\/www.bold.ne.jp\/engineer-club\/?p=789"},"modified":"2025-09-17T10:44:10","modified_gmt":"2025-09-17T01:44:10","slug":"java-this","status":"publish","type":"post","link":"https:\/\/www.bold.ne.jp\/engineer-club\/java-this","title":{"rendered":"Java\u306ethis\u3068\u306f\uff1fthis\/this()\u306e\u610f\u5473\u3084\u4f7f\u3044\u65b9"},"content":{"rendered":"<p>Java\u3067\u306e<span>this<\/span>\u306f\u3001\u4f7f\u308f\u308c\u308b\u7b87\u6240\u306b\u3088\u3063\u3066\u4ee5\u4e0b\u306e\u4e8c\u3064\u306e\u610f\u5473\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<ol>\n<li><strong>this\uff1a\u81ea\u5206\u81ea\u8eab\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u6307\u3059\u5909\u6570<\/strong><\/li>\n<li><strong>this()\uff1a\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u5185\u304b\u3089\u5225\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u547c\u3073\u51fa\u3059\u969b\u306e\u30e1\u30bd\u30c3\u30c9\u540d<\/strong><\/li>\n<\/ol>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u305d\u308c\u305e\u308c\u306e\u8aac\u660e\u3092\u521d\u7d1a\u8005\u5411\u3051\u306b\u884c\u3044\u307e\u3059\u306e\u3067\u3001\u305c\u3072\u3057\u3063\u304b\u308a\u7406\u89e3\u3057\u3066\u3044\u305f\u3060\u3051\u308c\u3070\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<p>\u306a\u304a\u3001<span>this<\/span>\u3092\u7406\u89e3\u3059\u308b\u306b\u306f\u3001<span>Java<\/span>\u306b\u304a\u3051\u308b\u300c\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u300d\u306e\u6982\u5ff5\u306e\u7406\u89e3\u304c\u524d\u63d0\u3068\u306a\u308a\u307e\u3059\u3002<br \/>\n\u3082\u3057\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u7406\u89e3\u306b\u81ea\u4fe1\u304c\u306a\u3044\u65b9\u306f\u3001\u5148\u306b\u53c2\u8003\u66f8\u3084\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u4e0a\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3067\u3001\u57fa\u790e\u7684\u306a\u7406\u89e3\u3092\u3057\u3066\u304a\u3044\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<div id=\"toc_container\" class=\"no_bullets\"><p class=\"toc_title\">\u76ee\u6b21<\/p><ul class=\"toc_list\"><li><a href=\"#Javathis\">\uff11\uff0e\u3010Java\u3011\u5909\u6570\u306ethis<\/a><ul><li><a href=\"#-this\">\uff11-\uff11\uff0ethis\u306f\u81ea\u5206\u81ea\u8eab\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u6307\u3059\u5909\u6570<\/a><\/li><li><a href=\"#-this-2\">\uff11-\uff12\uff0ethis\u306e\u4f7f\u3044\u65b9<\/a><\/li><li><a href=\"#-this-3\">\uff11-\uff13\uff0ethis\u3092\u4f7f\u3048\u308b\u3068\u3053\u308d\u3001\u4f7f\u3048\u306a\u3044\u3068\u3053\u308d<\/a><\/li><\/ul><\/li><li><a href=\"#Javathis-2\">\uff12\uff0e\u3010Java\u3011\u30e1\u30bd\u30c3\u30c9\u306ethis()<\/a><ul><li><a href=\"#-this-4\">\uff12-\uff11\uff0ethis()\u306f\u81ea\u5206\u81ea\u8eab\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u547c\u3076\u6642\u306b\u4f7f\u3046<\/a><\/li><li><a href=\"#-this-5\">\uff12-\uff12\uff0ethis()\u306e\u4f7f\u3044\u65b9\/\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u4f7f\u3044\u5206\u3051<\/a><\/li><\/ul><\/li><li><a href=\"#Javathis-3\">\uff13\uff0e\u3010Java\u3011this\u306b\u95a2\u3059\u308b\u5c11\u3057\u9032\u3093\u3060\u77e5\u8b58<\/a><ul><li><a href=\"#-this-6\">\uff13-\uff11\uff0e\u3010\u4e2d\u7d1a\u8005\u5411\u3051\u3011\u5185\u90e8\u30af\u30e9\u30b9\u306e\u30a8\u30f3\u30af\u30ed\u30fc\u30b8\u30f3\u30b0\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u6307\u3059this<\/a><\/li><li><a href=\"#-synchronizedthis\">\uff13-\uff12\uff0e\u3010\u4e2d\u7d1a\u8005\u5411\u3051\u3011synchronized\u30d6\u30ed\u30c3\u30af\u3067\u306ethis<\/a><\/li><li><a href=\"#-this-7\">\uff13-\uff13\uff0e\u3010\u4e0a\u7d1a\u8005\u5411\u3051\u3011\u30b9\u30fc\u30d1\u30fc\u30af\u30e9\u30b9\u3067\u306ethis<\/a><\/li><\/ul><\/li><li><a href=\"#i\">\uff14\uff0e\u307e\u3068\u3081<\/a><\/li><\/ul><\/div>\n<h2><span id=\"Javathis\">\uff11\uff0e\u3010Java\u3011\u5909\u6570\u306e<span>this<\/span><\/span><\/h2>\n<h3><span id=\"-this\">\uff11-\uff11\uff0ethis\u306f\u81ea\u5206\u81ea\u8eab\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u6307\u3059\u5909\u6570<\/span><\/h3>\n<p>this\u3068\u306f\u3001\u81ea\u5206\u81ea\u8eab\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u6307\u3059\u5909\u6570\u3067\u3059\u3002\u5909\u6570\u3092\u4f7f\u3063\u3066\u3001\u305d\u306e\u5909\u6570\u304c\u6307\u3059\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u3084\u30e1\u30bd\u30c3\u30c9\u3092\u53c2\u7167\u3057\u305f\u308a\u547c\u3073\u51fa\u305b\u308b\u306e\u3068\u540c\u3058\u3088\u3046\u306b\u3001\u81ea\u5206\u81ea\u8eab\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u660e\u793a\u7684\u306b\u6307\u3057\u793a\u3057\u3001\u305d\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u3084\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3044\u305f\u3044\u6642\u306b\u4f7f\u3046\u5909\u6570\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">\/\/ o\u3068\u3044\u3046\u5909\u6570\u3092\u7d4c\u7531\u3057\u3066\u3001\u5909\u6570\u304c\u6307\u3059\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059\r\nObject o = new Object();\r\no.toString();\r\n\r\n\/\/ thisObj\u3068\u3044\u3046\u5909\u6570\u3092\u7d4c\u7531\u3057\u3066\u3001\u81ea\u5206\u81ea\u8eab\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059\r\nObject thisObj = this;\r\nthisObj.toString();\r\n\r\n\/\/ \u2191\u3068\u307b\u307c\u540c\u3058\u610f\u5473\u3002this\u3068\u3044\u3046\u5909\u6570\u3092\u7d4c\u7531\u3057\u3066\u3001\u81ea\u5206\u81ea\u8eab\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059\r\nthis.toString();<\/pre>\n<p>this\u306e\u610f\u5473\u304b\u3089\u5f53\u7136\u306a\u306e\u3067\u3059\u304c\u3001<span>this<\/span>\u304c\u6307\u3059\u30e2\u30ce\u306f\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3054\u3068\u306b\u9055\u3044\u307e\u3059\u3002\u4f8b\u3048\u3070\u4ee5\u4e0b\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u305d\u306e\u9055\u3044\u306e\u78ba\u8a8d\u304c\u3067\u304d\u307e\u3059<span>(\u203b)<\/span>\u3002<\/p>\n<p>\u203bObject.toString()\u306e\u6a19\u6e96\u5b9f\u88c5\u306f\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u4fdd\u5b58\u5148\u30a2\u30c9\u30ec\u30b9\u3092\u8868\u73fe\u3057\u305f\u3082\u306e\u306a\u306e\u3067\u3001\u540c\u3058\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304b\u3069\u3046\u304b\u306e\u533a\u5225\u306b\u4f7f\u3048\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">class ThisSample1 {\r\n\tvoid printThis() {\r\n\t\tSystem.out.println(this); \/\/ \u30d7\u30ed\u30b0\u30e9\u30e0\u81ea\u4f53\u306f\u540c\u3058\u3060\u304c\u2026\r\n\t}\r\n\r\n\tpublic static void main(String args[]) {\r\n\t\t\/\/ \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30922\u3064\u751f\u6210\r\n\t\tThisSample1 sample1 = new ThisSample1();\r\n\t\tThisSample1 sample2 = new ThisSample1();\r\n\t\t\/\/ this\u304c\u6307\u3059\u3082\u306e\u306f\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3054\u3068\u306b\u9055\u3046\r\n\t\tsample1.printThis(); \/\/ \u2192 ThisSample1@70dea4e\r\n\t\tsample2.printThis(); \/\/ \u2192 ThisSample1@5c647e05\r\n\t}\r\n}<\/pre>\n<p>\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8<span>(\u203b)<\/span>\u3067\u306f\u3001<span>this<\/span>\u306e\u6709\u7121\u306b\u304b\u304b\u308f\u3089\u305a\u73fe\u5728\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u30fb\u30e1\u30bd\u30c3\u30c9\u3092\u53c2\u7167\u30fb\u5b9f\u884c\u3067\u304d\u307e\u3059\u306e\u3067\u3001\u660e\u78ba\u306a\u7406\u7531\u306a\u304f<span>this<\/span>\u3092\u4ed8\u3051\u308b\u610f\u5473\u306f\u8584\u3044\u3067\u3059\u3002<\/p>\n<p>\u203b\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30e1\u30bd\u30c3\u30c9\u3084\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306a\u3069\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u6301\u3061\u7269\u3068\u3057\u3066\u306e\u6587\u8108\u3067\u5b9f\u884c\u3055\u308c\u308b\u30b3\u30fc\u30c9\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">class ThisSample2 {\r\n\tint field = 123;\r\n\tObject objField = new Object();\r\n\r\n\tvoid instanceMethod() {\r\n\t\tSystem.out.println(\"instanceMethod\");\r\n\t}\r\n\r\n\tvoid thisTest() {\r\n\t\tSystem.out.println(field == this.field); \/\/ true\u3001\u540c\u3058\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u6307\u3057\u3066\u3044\u308b\u305f\u3081\r\n\t\tSystem.out.println(objField == this.objField); \/\/ \u540c\u4e0a\r\n\r\n\t\tinstanceMethod(); \/\/ \"instanceMethod\"\u304cprint\u3055\u308c\u308b\r\n\t\tthis.instanceMethod(); \/\/ \u540c\u4e0a\u3001\u540c\u3058\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u3066\u3044\u308b\u305f\u3081\r\n\t}\r\n\t\tpublic static void main(String[] args) {\r\n\t\tnew ThisSample2().thisTest();\r\n\t}\r\n}<\/pre>\n<p>\u3067\u3059\u304b\u3089\u3001<span>this<\/span>\u304c\u4ed8\u3051\u3089\u308c\u308b\u304b\u3089\u3068\u3001\u5168\u3066\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u53c2\u7167\u30fb\u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057\u306b<span>this<\/span>\u3092\u4ed8\u3051\u308b\u3068\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u5197\u9577\u306b\u306a\u308a\u307e\u3059\u3002<span>Java<\/span>\u5411\u3051\u306e\u958b\u767a\u74b0\u5883\u3084\u30a8\u30c7\u30a3\u30bf\u3067\u306f\u30d5\u30a3\u30fc\u30eb\u30c9\u30fb\u30e1\u30bd\u30c3\u30c9\u306a\u3069\u3078\u306f\u8272\u5206\u3051\u3092\u3057\u3066\u304f\u308c\u308b\u306e\u3067\u306a\u304a\u3055\u3089\u3067\u3059\u3002\u305f\u3060\u3057\u3001\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u30eb\u30fc\u30eb\u3068\u3057\u3066\u4ed8\u3051\u308b\u3053\u3068\u306b\u306a\u3063\u3066\u3044\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h3><span id=\"-this-2\">\uff11-\uff12\uff0ethis\u306e\u4f7f\u3044\u65b9<\/span><\/h3>\n<h4>\uff11-\uff12-\uff11\uff0e\u4f7f\u3044\u65b9\u306e\u4f8b<span>\u2460<\/span>\uff1a\u30d5\u30a3\u30fc\u30eb\u30c9\u3068\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u306e\u540d\u524d\u3092\u540c\u3058\u306b\u3057\u305f\u3044\u6642<\/h4>\n<p>this\u304c\u6700\u3082\u4f7f\u308f\u308c\u308b\u30b1\u30fc\u30b9\u306f\u3001\u30d5\u30a3\u30fc\u30eb\u30c9\u3068\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u306e\u540d\u79f0\u3092\u540c\u3058\u306b\u3057\u305f\u3044\u6642\u3067\u3059\u3002<span>Java<\/span>\u3067\u306e\u5909\u6570\u540d\u306f\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u304c\u512a\u5148\u3055\u308c\u308b\u306e\u3067\u3001\u5909\u6570\u540d\u304c\u91cd\u8907\u3059\u308b\u5834\u5408\u3001\u30d5\u30a3\u30fc\u30eb\u30c9\u3078\u306f<span>this<\/span>\u3092\u4ed8\u3051\u3066\u533a\u5225\u3057\u307e\u3059\u3002\u306a\u304a\u3001\u3053\u308c\u306f<span>setter<\/span>\u3068\u547c\u3070\u308c\u308b\u30d1\u30bf\u30fc\u30f3\u3067\u306f\u307b\u307c\u5fc5\u9808\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">class ThisSample3 {\r\n\tint field = 123;\r\n\r\n\tvoid instanceMethod() {\r\n\t\tint field = 456; \/\/ \u30d5\u30a3\u30fc\u30eb\u30c9\u540d\u3068\u540c\u3058\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u3092\u5ba3\u8a00\r\n\t\tSystem.out.println(field); \/\/ \u2192456\r\n\t\tSystem.out.println(this.field); \/\/ \u2192123\u3001\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u6307\u5b9a\u3057\u305f\u3044\u5834\u5408\u306fthis\u3092\u7d4c\u7531\u3059\u308b\r\n\t}\r\n\r\n\t\/\/ \u6700\u3082\u3088\u304f\u4f7f\u308f\u308c\u308b\u30d1\u30bf\u30fc\u30f3(setter\u30d1\u30bf\u30fc\u30f3)\r\n\tvoid setField(int field) {\r\n\t\tthis.field = field;\r\n\t}\r\n}<\/pre>\n<h4>\uff11-\uff12-\uff12\uff0e\u4f7f\u3044\u65b9\u306e\u4f8b<span>\u2461<\/span>\uff1a\u81ea\u5206\u81ea\u8eab\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u3068\u3057\u305f\u3044\u5834\u5408<\/h4>\n<p>this\u306f\u81ea\u5206\u81ea\u8eab\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u3068\u3057\u305f\u3044\u6642\u306b\u3082\u4f7f\u3044\u307e\u3059\u3002\u3053\u308c\u306f<span>Java<\/span>\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3067\u306e\u30a4\u30c7\u30a3\u30aa\u30e0\u306e\u4e00\u3064\u3067\u3082\u3042\u308a\u3001\u3044\u308d\u3044\u308d\u306a\u6240\u3067\u898b\u304b\u3051\u307e\u3059\u3002<\/p>\n<p>this\u3092\u623b\u3059\u3053\u3068\u3067\u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3\u304c\u4f7f\u3048\u308b\u3088\u3046\u306b\u306a\u308a\u3001\u76f4\u63a5\u7684\u306b\u306f\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u884c\u6570\u3092\u6e1b\u3089\u305b\u307e\u3059\u3002\u3053\u308c\u306f\u6a19\u6e96<span>API<\/span>\u306e<span>StringBuilder<\/span>\u3092\u4f7f\u3046\u969b\u306e\u30a4\u30e1\u30fc\u30b8\u304c\u5206\u304b\u308a\u3084\u3059\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">class ThisSample4 {\r\n\tThisSample4 getThis() {\r\n\t\treturn this;\r\n\t}\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tThisSample4 sample = new ThisSample4();\r\n\t\tsample.getThis().getThis().getThis().getThis(); \/\/ getThis()\u3092\u5ef6\u3005\u3068\u7d9a\u3051\u3066\u66f8\u3051\u308b\r\n\t}\r\n}\r\n\r\n\/\/ StringBuilder\u3067\u306e\u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3\u306e\u4f8b\r\nStringBuilder sb = new StringBuilder();\r\nsb.append(\"A\").append(\"B\").append(\"C\"); \/\/ StringBuilder\u306eappend\u306fthis\u3092\u623b\u3059\u306e\u30671\u884c\u3067\u66f8\u3051\u308b\r\nsb.append(1); \/\/ \u3053\u306e\u3088\u3046\u306b\u66f8\u3044\u3066\u3082\u3044\u3044\u304c\u30013\u884c\u5fc5\u8981\u306b\u306a\u3063\u3066\u3057\u307e\u3046\r\nsb.append(2);\r\nsb.append(3);<\/pre>\n<p>\u3053\u306e\u8003\u3048\u65b9\u3092\u63a8\u3057\u9032\u3081\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u3082\u306e\u3068\u306a\u308a\u307e\u3059\u3002\u5404\u30e1\u30bd\u30c3\u30c9\u306f\u5358\u6a5f\u80fd\u3068\u3057\u306a\u304c\u3089\u3082\u3001\u4f55\u304b\u306e\u307e\u3068\u307e\u3063\u305f\u51e6\u7406\u3092\u9023\u7d9a\u3057\u3066\u884c\u3046\u30a4\u30e1\u30fc\u30b8\u3067\u3059\u3002\u3053\u306e\u3088\u3046\u306a\u8a18\u8ff0\u3092\u3059\u308b<span>API<\/span>\u3084\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3082\u591a\u3044\u306e\u3067\u3059\u304c\u3001\u8208\u5473\u304c\u3042\u308b\u65b9\u306f\u300c<span>Fluent interface(<\/span>\u6d41\u308c\u308b\u3088\u3046\u306a\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9<span>)<\/span>\u300d\u3067\u691c\u7d22\u3059\u308b\u3068\u66f4\u306a\u308b\u77e5\u8b58\u3092\u5f97\u3089\u308c\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">new SomeClass().method1().method2().method3();<\/pre>\n<h3><span id=\"-this-3\">\uff11-\uff13\uff0ethis\u3092\u4f7f\u3048\u308b\u3068\u3053\u308d\u3001\u4f7f\u3048\u306a\u3044\u3068\u3053\u308d<\/span><\/h3>\n<h4>\uff11-\uff13-\uff11\uff0ethis\u306f\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u30b9\u30b3\u30fc\u30d7\u3067\u4f7f\u3048\u308b<\/h4>\n<p>this\u306f\u3001<span>Java 11<\/span>\u306e\u6642\u70b9\u3067\u306f\u4ee5\u4e0b\u306e\u3068\u3053\u308d\u3067\u4f7f\u3048\u307e\u3059\u3002<\/p>\n<ol>\n<li>\u2460\u30e1\u30bd\u30c3\u30c9\u306e\u4e2d<span>(<\/span>\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30e1\u30bd\u30c3\u30c9\u3001\u30c7\u30d5\u30a9\u30eb\u30c8\u30e1\u30bd\u30c3\u30c9<span>(Java 8<\/span>\u4ee5\u964d<span>)<\/span>\u3001\u30e9\u30e0\u30c0\u5f0f<span>(Java 8<\/span>\u4ee5\u964d<span>))<\/span><\/li>\n<li>\u2461\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u4e2d<\/li>\n<li>\u2462\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30a4\u30cb\u30b7\u30e3\u30e9\u30a4\u30b6\u306e\u4e2d<\/li>\n<li>\u2463\u30d5\u30a3\u30fc\u30eb\u30c9\u521d\u671f\u5316\u6642\u306e\u53f3\u8fba\u5024\u306e\u4e2d<\/li>\n<li>\u2464Receiver Parameter\u3068\u3057\u3066(Java 8\u4ee5\u964d)<\/li>\n<\/ol>\n<p>this\u3092\u4f7f\u3048\u308b\u3068\u3053\u308d\u306e\u4f8b\u3068\u3057\u3066\u306f\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3067\u3059\u3002\u7121\u540d\u30af\u30e9\u30b9\u3084\u5185\u90e8\u30af\u30e9\u30b9\u3067\u306ethis\u306f\u5c11\u3057\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059(\u8a73\u7d30\u306f\u5f8c\u8ff0\u3057\u307e\u3059)\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">import java.util.function.Supplier;\r\n\r\nclass ThisSample5 implements ThisSample5Interface {\r\n\tint field = 123;\r\n\tfinal int finalField = this.field * 100; \/\/ \u2463\u30d5\u30a3\u30fc\u30eb\u30c9\u521d\u671f\u5316\u6642\u306e\u53f3\u8fba\u5024\r\n\r\n\t\/\/ \u2462\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30a4\u30cb\u30b7\u30e3\u30e9\u30a4\u30b6\r\n\t{\r\n\t\tSystem.out.println(\"Instance Initialzer: \" + this);\r\n\t}\r\n\r\n\t\/\/ \u2461\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\r\n\tThisSample5() {\r\n\t\tSystem.out.println(\"Constructor(default): \" + this);\r\n\t}\r\n\t\t\/\/ \u2460-1 \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30e1\u30bd\u30c3\u30c9\r\n\tvoid instanceMethod() {\r\n\t\tSystem.out.println(\"Instance Method: \" + this);\r\n\r\n\t\t\/\/ \u7121\u540d\u30af\u30e9\u30b9\r\n\t\tSupplier&lt;Integer&gt; s1 = new Supplier&lt;Integer&gt;() {\r\n\t\t\tint anonymousClassField = 100;\r\n\t\t\t\tpublic Integer get() {\r\n\t\t\t\tSystem.out.println(\"Anonymous Class: \" + this); \/\/ \u7121\u540d\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\r\n\t\t\t\tSystem.out.println(\"Enclosing Instance: \" + ThisSample5.this); \/\/ \u7121\u540d\u30af\u30e9\u30b9\u306e\u30a8\u30f3\u30af\u30ed\u30fc\u30b8\u30f3\u30b0\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\r\n\t\t\t\treturn this.anonymousClassField;\r\n\t\t\t}\r\n\t\t};\r\n\t\ts1.get();\r\n\r\n\t\t\/\/ \u5185\u90e8\u30af\u30e9\u30b9\r\n\t\tSupplier&lt;Integer&gt; s2 = new ThisSampleInnerClass();\r\n\t\ts2.get();\r\n\r\n\t\t\/\/ \u2460-3 \u30e9\u30e0\u30c0\u5f0f\r\n\t\tSupplier&lt;Integer&gt; s3 = () -&gt; {\r\n\t\t\tSystem.out.println(\"Lambda: \" + this);\r\n\t\t\treturn this.finalField;\r\n\t\t};\r\n\t\ts3.get();\r\n\t}\r\n\r\n\t\/\/ \u2464Receiver Paramter\r\n\tvoid instanceMethod2(ThisSample5 this) {\r\n\t\tSystem.out.println(\"Receiver Parameter: \" + this);\r\n\t}\r\n\r\n\t\/\/ \u5185\u90e8\u30af\u30e9\u30b9\r\n\tclass ThisSampleInnerClass implements Supplier&lt;Integer&gt; {\r\n\t\tint innerClassField = 12345;\r\n\r\n\t\tpublic Integer get() {\r\n\t\t\tSystem.out.println(\"Inner Class: \" + this); \/\/ \u5185\u90e8\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\r\n\t\t\tSystem.out.println(\"Enclosing Instance: \" + ThisSample5.this); \/\/ \u5185\u90e8\u30af\u30e9\u30b9\u306e\u30a8\u30f3\u30af\u30ed\u30fc\u30b8\u30f3\u30b0\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\r\n\t\t\treturn this.innerClassField;\r\n\t\t}\r\n\t}\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tThisSample5 sample = new ThisSample5();\r\n\t\tSystem.out.println(\"Caller: \" + sample.toString());\r\n\t\tsample.instanceMethod();\r\n\t\tsample.instanceMethod2();\r\n\t\tsample.defaultMethod();\r\n\t}\r\n}\r\n\r\ninterface ThisSample5Interface {\r\n\t\/\/ \u2460-2 \u30c7\u30d5\u30a9\u30eb\u30c8\u30e1\u30bd\u30c3\u30c9\r\n\tdefault void defaultMethod() {\r\n\t\tSystem.out.println(\"Default Method: \" + this);\r\n\t}\r\n}<\/pre>\n<h4><span class=\"f-marker-p\">\u5b9f\u884c\u7d50\u679c\u30b5\u30f3\u30d7\u30eb\uff1a<\/span><\/h4>\n<pre class=\"prettyprint lang:default decode:true\">Instance Initialzer: ThisSample5@4411d970\r\nConstructor(default): ThisSample5@4411d970\r\nCaller: ThisSample5@4411d970\r\nInstance Method: ThisSample5@4411d970\r\nAnonymous Class: ThisSample5$1@60f82f98\r\nEnclosing Instance: ThisSample5@4411d970\r\nInner Class: ThisSample5$ThisSampleInnerClass@7f690630\r\nEnclosing Instance: ThisSample5@4411d970\r\nLambda: ThisSample5@4411d970\r\nReceiver Parameter: ThisSample5@4411d970\r\nDefault Method: ThisSample5@4411d970<\/pre>\n<h4>\uff11-\uff13-\uff12\uff0ethis\u306f\u30af\u30e9\u30b9\u306e\u30b9\u30b3\u30fc\u30d7\u3067\u306f\u4f7f\u3048\u306a\u3044<\/h4>\n<p>this\u3092\u4f7f\u3048\u308b\u306e\u306f\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u5185\u3060\u3051\u3067\u3059\u3002\u3064\u307e\u308a\u3001\u30af\u30e9\u30b9\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3001\u8a00\u3044\u63db\u3048\u308c\u3070<span>static<\/span>\u306a\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u5185<span>(static<\/span>\u30e1\u30bd\u30c3\u30c9\u30fb<span>static<\/span>\u30a4\u30cb\u30b7\u30e3\u30e9\u30a4\u30b6\u306a\u3069<span>)<\/span>\u3067\u306f<span>this<\/span>\u3092\u4f7f\u3046\u3068\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u306a\u308a\u307e\u3059\u3002<span>static<\/span>\u306a\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u5185\u3067\u306f\u3001\u7d10\u4ed8\u3044\u3066\u3044\u308b\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u306a\u3044\u304b\u3089\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">class ThisSample6 {\r\n\tint instanceField = 1;\r\n\tstatic staticField = this.instanceField * 100; \/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc!!\r\n\t\r\n\t\/\/ static\u30a4\u30cb\u30b7\u30e3\u30e9\u30a4\u30b6\r\n\tstatic {\r\n\t\tSystem.out.println(this); \/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc!!\r\n\t}\r\n\r\n\t\/\/ static\u30e1\u30bd\u30c3\u30c9\r\n\tstatic void staticMethod(ThisSample6 this) { \/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc!!\r\n\t\tSystem.out.println(this); \/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc!!\r\n\t}\r\n\r\n\t\/\/ static\u306a\u5185\u90e8\u30af\u30e9\u30b9\r\n\tstatic class InnerClass {\r\n\t\tvoid instanceMethod() {\r\n\t\t\tSystem.out.println(ThisSample6.this); \/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc!!\r\n\t\t}\r\n\t}\r\n}<\/pre>\n<h2><span id=\"Javathis-2\">\uff12\uff0e\u3010Java\u3011\u30e1\u30bd\u30c3\u30c9\u306ethis()<\/span><\/h2>\n<h3><span id=\"-this-4\">\uff12-\uff11\uff0ethis()\u306f\u81ea\u5206\u81ea\u8eab\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u547c\u3076\u6642\u306b\u4f7f\u3046<\/span><\/h3>\n<p>Java\u3067\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u66f8\u3044\u3066\u3044\u308b\u3068\u3001\u3042\u308b\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u304b\u3089\u3001\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u3057\u305f\u5225\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u660e\u793a\u7684\u306b\u547c\u3073\u305f\u3044\u6642\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u6642\u306b<span>this()<\/span>\u3092\u4f7f\u3044\u307e\u3059\u3002<\/p>\n<p>\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u4e2d\u304b\u3089\u547c\u3079\u308b\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u30e1\u30bd\u30c3\u30c9\u540d\u306f<span>&#8220;this&#8221;<\/span>\u3067\u56fa\u5b9a\u306a\u306e\u3067\u3001\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u3057\u305f\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u5185\u306e\u3069\u308c\u3092\u547c\u3073\u51fa\u3059\u304b\u306f\u3001\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u5f15\u6570\u3067\u533a\u5225\u3057\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u306e\u4f8b\u3067\u8a00\u3046\u3068\u3001<span>\u2462\u2192\u2461\u2192\u2460<\/span>\u306e\u9806\u756a\u306b\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u304c\u547c\u3070\u308c\u3001<span>\u2460\u2192\u2461\u2192\u2462<\/span>\u306e\u9806\u756a\u3067\u5b9f\u884c\u3055\u308c\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">class ThisSample7 {\r\n\tString name;\r\n\tint amount;\r\n\r\n\t\/\/ \u2460\u30c7\u30d5\u30a9\u30eb\u30c8\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\r\n\tThisSample7() {\r\n\t\tthis.name = \"\u540d\u7121\u3057\u306e\u6a29\u5175\u885b\";\r\n\t\tthis.amount = 0;\r\n\t}\r\n\r\n\t\/\/ \u2461\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u3057\u305f\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf(\u305d\u306e1)\r\n\tThisSample7(String name) {\r\n\t\tthis(); \/\/ \u2460\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u547c\u3073\u51fa\u3059\r\n\t\tthis.name = name;\r\n\t}\r\n\r\n\t\/\/ \u2462\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u3057\u305f\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf(\u305d\u306e2)\r\n\tThisSample7(String name, int amount) {\r\n\t\tthis(name); \/\/ \u2461\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u547c\u3073\u51fa\u3059\r\n\t\tthis.amount = amount;\r\n\t}\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tnew ThisSample7(\"\u5c71\u7530\u592a\u90ce\", 1000);\r\n\t}\r\n}<\/pre>\n<h3><span id=\"-this-5\">\uff12-\uff12\uff0ethis()\u306e\u4f7f\u3044\u65b9<span>\/<\/span>\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u4f7f\u3044\u5206\u3051<\/span><\/h3>\n<p>this()\u306e\u826f\u304f\u3042\u308b\u4f7f\u3044\u9053\u306f\u3001\u8907\u6570\u306e\u5f15\u6570\u3092\u6301\u3064\u5171\u901a\u7684\u306a\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u7528\u610f\u3057\u3066\u304a\u3044\u3066\u3001\u547c\u3073\u51fa\u3059\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306b\u5fdc\u3058\u3066\u8a2d\u5b9a\u5024\u3092\u5909\u3048\u305f\u308a\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u3092\u8a2d\u5b9a\u3059\u308b\u3001\u3068\u3044\u3046\u3082\u306e\u3067\u3059\u3002<\/p>\n<p>\u305d\u308c\u306b\u3088\u308a\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u521d\u671f\u5316\u51e6\u7406\u3092\u4e00\u3064\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306b\u307e\u3068\u3081\u3089\u308c\u308b\u306e\u3067\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u5206\u304b\u308a\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3057\u3001\u4fdd\u5b88\u6027\u3082\u9ad8\u307e\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u4f8b\u3060\u3068\u3001\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u5b9f\u8cea\u7684\u306a\u521d\u671f\u5316\u306f\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf<span>\u2462<\/span>\u3067\u884c\u3063\u3066\u3044\u307e\u3059\u3002<span>\u2460<\/span>\u3068<span>\u2461<\/span>\u306f\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u3092\u5f15\u6570\u306b\u3001<span>\u2462<\/span>\u3092\u547c\u3073\u51fa\u3057\u3066\u3044\u308b\u3060\u3051\u3067\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u521d\u671f\u5316\u51e6\u7406\u306e\u8a18\u8ff0\u3092<span>\u2462<\/span>\u3060\u3051\u306b\u51fa\u6765\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">class ThisSample8 {\r\n\tString name;\r\n\tint amount;\r\n\r\n\t\/\/ \u2460\u30c7\u30d5\u30a9\u30eb\u30c8\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\r\n\tThisSample8() {\r\n\t\tthis(\"\u540d\u7121\u3057\u306e\u6a29\u5175\u885b\", 10); \/\/ \u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u3067\u2462\u3092\u547c\u3073\u51fa\u3059\r\n\t}\r\n\r\n\t\/\/ \u2461\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u3057\u305f\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf(\u305d\u306e1)\r\n\tThisSample8(String name) {\r\n\t\tthis(name, 20); \/\/ \u5f15\u6570\u3092\u4f7f\u3044\u3064\u3064\u3001\u2462\u3092\u547c\u3073\u51fa\u3059\r\n\t}\r\n\r\n\t\/\/ \u2462\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u3057\u305f\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf(\u305d\u306e2)\r\n\tThisSample8(String name, int amount) {\r\n\t\t\/\/ \u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u521d\u671f\u5316\u306f\u3053\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3060\u3051\u3067\u884c\u3046\r\n\t\tthis.name = name;\r\n\t\tthis.amount = amount;\r\n\t}\r\n\r\n\tvoid printProperty() {\r\n\t\tSystem.out.println(String.format(\"\u79c1\u306e\u540d\u524d\u306f%s\u3067\u3059\u3002\u6240\u6301\u91d1\u306f%d\u5186\u3067\u3059\u3002\", name, amount));\r\n\t}\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tThisSample8 sample1 = new ThisSample8();\r\n\t\tsample1.printProperty(); \/\/ \u2192 \u540d\u7121\u3057\u306e\u6a29\u5175\u885b\u300110\u5186\r\n\r\n\t\tThisSample8 sample2 = new ThisSample8(\"\u5c71\u7530\u592a\u90ce\");\r\n\t\tsample2.printProperty(); \/\/ \u2192 \u5c71\u7530\u592a\u90ce\u300120\u5186\r\n\r\n\t\tThisSample8 sample3 = new ThisSample8(\"\u9234\u6728\u6b21\u90ce\", 1000);\r\n\t\tsample3.printProperty(); \/\/ \u2192 \u9234\u6728\u6b21\u90ce\u30011000\u5186\r\n\t}\r\n}<\/pre>\n<h2><span id=\"Javathis-3\">\uff13\uff0e\u3010Java\u3011this\u306b\u95a2\u3059\u308b\u5c11\u3057\u9032\u3093\u3060\u77e5\u8b58<\/span><\/h2>\n<h3><span id=\"-this-6\">\uff13-\uff11\uff0e\u3010\u4e2d\u7d1a\u8005\u5411\u3051\u3011\u5185\u90e8\u30af\u30e9\u30b9\u306e\u30a8\u30f3\u30af\u30ed\u30fc\u30b8\u30f3\u30b0\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u6307\u3059<span>this<\/span><\/span><\/h3>\n<p>\u5185\u90e8\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5185\u304b\u3089\u3001\u305d\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u7d10\u3065\u3044\u3066\u3044\u308b\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9<span>(<\/span>\u30a8\u30f3\u30af\u30ed\u30fc\u30b8\u30f3\u30b0\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9<span>)<\/span>\u306e\u53c2\u7167\u3092\u5f97\u305f\u3044\u5834\u5408\u306f\u3001\u5c11\u3005\u7279\u6b8a\u306a<span>this<\/span>\u306e\u6307\u5b9a\u306e\u4ed5\u65b9\u3092\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">class ThisSample9 {\r\n\tint field = 123;\r\n\r\n\tclass InnerClass {\r\n\t\tint field = 456;\r\n\r\n\t\tvoid innerClassMethod() {\r\n\t\t\tSystem.out.println(field); \/\/ \u2192 456\r\n\t\t\tSystem.out.println(this.field); \/\/ \u2192 456\u3001\u3053\u3053\u3067\u306ethis\u306fInnerClass\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\r\n\t\t\tSystem.out.println(ThisSample9.this.field); \/\/ \u2192123\u3001\u30af\u30e9\u30b9\u3092\u660e\u793a\u7684\u306b\u6307\u5b9a\u3057\u3066this\u3092\u5f97\u308b\r\n\t\t}\r\n\t}\r\n\t\t\r\n\tpublic static void main(String[] args) {\r\n\t\t(new ThisSample9().new InnerClass()).innerClassMethod();\r\n\t}\r\n}<\/pre>\n<p>\u5185\u90e8\u30af\u30e9\u30b9\u306e\u4e2d\u304b\u3089\u300c\u30af\u30e9\u30b9\u540d<span>.this<\/span>\u300d\u3068\u3059\u308b\u3068\u3001\u305d\u306e\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u5f97\u3089\u308c\u307e\u3059\u3002\u3084\u3084\u3053\u3057\u3044\u306e\u3067\u3059\u304c\u3001\u30a4\u30e1\u30fc\u30b8\u3068\u3057\u3066\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u89aa\u5b50\u72b6\u306b\u95a2\u4fc2\u4ed8\u3051\u3089\u308c\u3066\u3044\u308b\u3068\u8003\u3048\u3066\u3082\u3089\u3048\u308c\u3070\u3044\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<ul>\n<li>ThisSample9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9<\/li>\n<li>\u00a0 \u00a0\u2517InnerClass\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9<\/li>\n<\/ul>\n<h3><span id=\"-synchronizedthis\">\uff13-\uff12\uff0e\u3010\u4e2d\u7d1a\u8005\u5411\u3051\u3011<span>synchronized<\/span>\u30d6\u30ed\u30c3\u30af\u3067\u306e<span>this<\/span><\/span><\/h3>\n<p>\u6392\u4ed6\u5236\u5fa1\u306e\u305f\u3081\u3001\u4ee5\u4e0b\u306e\u66f8\u304d\u65b9\u3092\u3057\u3066\u3044\u308b\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u3092\u591a\u304f\u898b\u304b\u3051\u307e\u3057\u305f\u3002\u3053\u308c\u306f\u6392\u4ed6\u5236\u5fa1\u3092\u884c\u3046\u969b\u306e\u4e00\u3064\u306e\u30a4\u30c7\u30a3\u30aa\u30e0\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">synchronized(this) {\r\n\t\/\/ \u6392\u4ed6\u5b9f\u884c\u3057\u305f\u3044\u51e6\u7406\r\n}<\/pre>\n<p>\u3053\u308c\u306f\u3001\u81ea\u5206\u81ea\u8eab\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u6392\u4ed6\u5236\u5fa1\u306e\u30e2\u30cb\u30bf\u30fc\u3068\u3057\u3066\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002\u3067\u3059\u306e\u3067\u3001\u3053\u306e<span>synchronized<\/span>\u30d6\u30ed\u30c3\u30af\u306f\u3001<span>1<\/span>\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3054\u3068\u306b\u5fc5\u305a<span>1<\/span>\u3064\u306e\u30b9\u30ec\u30c3\u30c9\u304b\u3089\u3057\u304b\u5b9f\u884c\u3055\u308c\u306a\u3044\u3053\u3068\u304c\u4fdd\u8a3c\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u306a\u304a\u3001\u4eca\u3067\u306f\u6392\u4ed6\u5236\u5fa1\u306b\u306f<span>java.util.concurrent<\/span>\u306b\u3042\u308b\u5404\u7a2e<span>Lock<\/span>\u30af\u30e9\u30b9\u3092\u4f7f\u3046\u3053\u3068\u304c\u591a\u3044\u306e\u3067\u3001<span>synchronized<\/span>\u30d6\u30ed\u30c3\u30af\u3092\u4f7f\u3046\u30b1\u30fc\u30b9\u306f\u6e1b\u308a\u307e\u3057\u305f\u3002\u3067\u3059\u304c\u3001\u6614\u306e\u66f8\u7c4d\u3084\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u3092\u8aad\u3080\u3053\u3068\u3082\u3042\u308b\u3067\u3057\u3087\u3046\u304b\u3089\u3001\u610f\u5473\u306f\u3057\u3063\u304b\u308a\u7406\u89e3\u3057\u3066\u304a\u304d\u305f\u3044\u3082\u306e\u3067\u3059\u3002<\/p>\n<h3><span id=\"-this-7\">\uff13-\uff13\uff0e\u3010\u4e0a\u7d1a\u8005\u5411\u3051\u3011\u30b9\u30fc\u30d1\u30fc\u30af\u30e9\u30b9\u3067\u306e<span>this<\/span><\/span><\/h3>\n<p>\u7d99\u627f\u95a2\u4fc2\u306e\u3042\u308b\u30af\u30e9\u30b9\u3067<span>this<\/span>\u3092\u4f7f\u3046\u6642\u306f\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<span>this<\/span>\u304c\u5b9f\u969b\u306b\u6307\u3057\u3066\u3044\u308b\u3082\u306e\u304c\u4f55\u304b\u3092\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u306e\u89b3\u70b9\u304b\u3089\u610f\u8b58\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u304b\u3089\u3067\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u306e\u4f8b\u306f\u3001<span>Java<\/span>\u3067\u306e\u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30ba\u30e0\u306e\u7279\u5fb4\u3068<span>this<\/span>\u3092\u3057\u3063\u304b\u308a\u7406\u89e3\u3057\u3066\u3044\u306a\u3044\u3068\u3001\u76f4\u611f\u306b\u53cd\u3059\u308b\u52d5\u304d\u3092\u3057\u3066\u3044\u308b\u3068\u601d\u308f\u308c\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002\u3069\u3046\u3044\u3046\u5024\u304c\u8868\u793a\u3055\u308c\u308b\u304b\u4e88\u60f3\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">class ThisSample10Parent {\r\n\t\/\/ \u30d5\u30a3\u30fc\u30eb\u30c9\u2460\r\n\tint instanceField = 123;\r\n\r\n\t\/\/ \u30e1\u30bd\u30c3\u30c9\u2460\r\n\tvoid methodOverride() {\r\n\t\tSystem.out.println(\"Parent.methodOverride\");\r\n\t\tSystem.out.println(\"this is \" + this);\r\n\t\tSystem.out.println(\"this.instanceField is \" + this.instanceField);\r\n\t}\r\n\r\n\tvoid methodOfSuperClass() {\r\n\t\tSystem.out.println(\"Parent.methodOfSuperClass\");\r\n\t\tSystem.out.println(\"this is \" + this); \/\/ \u3053\u3053\u3067\u306ethis\u306f\u4f55\u304b?\r\n\t\tSystem.out.println(\"this.instanceField is \" + this.instanceField); \/\/ \u30d5\u30a3\u30fc\u30eb\u30c9\u2460\u3068\u2461\u306e\u3069\u3061\u3089\u304b?\r\n\t\tthis.methodOverride(); \/\/ \u30e1\u30bd\u30c3\u30c9\u2460\u3068\u2461\u306e\u3069\u3061\u3089\u304c\u547c\u3070\u308c\u308b\u304b?\r\n\t\t\/\/ this.methodOfSubclass(); \/\/ \u30e1\u30bd\u30c3\u30c9\u2462\u306f\u3053\u3053\u304b\u3089\u547c\u3073\u51fa\u305b\u308b\u304b?\r\n\t}\r\n}\r\n\r\nclass ThisSample10Child extends ThisSample10Parent {\r\n\t\/\/ \u30d5\u30a3\u30fc\u30eb\u30c9\u2461\r\n\tint instanceField = 456;\r\n\r\n\t\/\/ \u30e1\u30bd\u30c3\u30c9\u2461\r\n\tvoid methodOverride() {\r\n\t\tSystem.out.println(\"Child.methodOverride\");\r\n\t\tSystem.out.println(\"this is \" + this);\r\n\t\tSystem.out.println(\"this.instanceField is \" + this.instanceField);\r\n\t}\r\n\r\n\t\/\/ \u30e1\u30bd\u30c3\u30c9\u2462\r\n\tvoid methodOfSubclass() {\r\n\t\tSystem.out.println(\"Child.methodOfSubclass\");\r\n\t}\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tThisSample10Child sample = new ThisSample10Child();\r\n\t\tsample.methodOfSuperClass();\r\n\t}\r\n}<\/pre>\n<div class=\"attention a-3\">\n<p class=\"attention-title\" style=\"text-align: left;\">ThisSample10Child\u306e\u5b9f\u884c\u7d50\u679c\u4f8b<\/p>\n<ul>\n<li>Parent.methodOfSuperClass \u2190\u30b9\u30fc\u30d1\u30fc\u30af\u30e9\u30b9\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u547c\u3070\u308c\u305f<\/li>\n<li>this is ThisSample10Child@4411d970 \u2190this\u306f\u30b5\u30d6\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u6307\u3059<\/li>\n<li>this.instanceField is 123 \u2190this.instanceField\u306f\u30b9\u30fc\u30d1\u30fc\u30af\u30e9\u30b9\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u6307\u3059<\/li>\n<li>Child.methodOverride \u2190\u30b5\u30d6\u30af\u30e9\u30b9\u306e\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u6e08\u307f\u30e1\u30bd\u30c3\u30c9<span>\u2461<\/span>\u304c\u5b9f\u884c\u3055\u308c\u305f<\/li>\n<li>this is ThisSample10Child@4411d970 \u2190\u3053\u3053\u3067\u306e<span>this<\/span>\u306f\u3001\u5f53\u7136\u30b5\u30d6\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u6307\u3059<\/li>\n<li>this.instanceField is 456 \u2190this.instanceField\u306f\u30b5\u30d6\u30af\u30e9\u30b9\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u6307\u3059<\/li>\n<\/ul>\n<\/div>\n<p>\u30b5\u30d6\u30af\u30e9\u30b9\u304b\u3089\u547c\u3073\u51fa\u3055\u308c\u305f\u5834\u5408\u3001\u30b9\u30fc\u30d1\u30fc\u30af\u30e9\u30b9\u3067\u306e<span>this<\/span>\u306f\u3001\u30b5\u30d6\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u6307\u3057\u307e\u3059\u3002\u3067\u3059\u306e\u3067\u3001\u30e1\u30bd\u30c3\u30c9\u3092\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3057\u305f\u5834\u5408\u306b\u547c\u3070\u308c\u308b\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u4f53\u306f\u3001\u30b5\u30d6\u30af\u30e9\u30b9\u306e\u3082\u306e\u3067\u3059<span>(this<\/span>\u7d4c\u7531\u3067\u306a\u304f\u3066\u3082\u305d\u3046\u3067\u3059<span>)<\/span>\u3002<\/p>\n<p>\u305d\u3057\u3066\u3001\u30b9\u30fc\u30d1\u30fc\u30af\u30e9\u30b9\u3092\u76f4\u63a5<span>new<\/span>\u3057\u305f\u5834\u5408\u306e<span>this<\/span>\u306f\u3001\u5f53\u7136\u306a\u304c\u3089\u30b9\u30fc\u30d1\u30fc\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u6307\u3057\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u3053\u305d\u304c\u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30ba\u30e0\u306e\u4f5c\u7528\u3067\u3059\u3002<span>this<\/span>\u304c\u6307\u3059\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u5b9f\u4f53\u306f\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u306b\u5fdc\u3058\u3066\u5909\u308f\u308a\u307e\u3059\u304c\u3001\u305d\u308c\u3092<span>Java<\/span>\u4eee\u60f3\u30de\u30b7\u30f3\u304c\u628a\u63e1\u3057\u3066\u304a\u308a\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306b\u7d10\u3065\u3051\u3089\u308c\u305f\u30e1\u30bd\u30c3\u30c9\u3092\u9069\u5207\u306b\u547c\u3073\u5206\u3051\u3066\u3044\u308b\u306e\u3067\u3059\u3002<\/p>\n<p>\u6ce8\u610f\u3059\u3079\u304d\u306f\u30b9\u30fc\u30d1\u30fc\u30af\u30e9\u30b9\u5185\u306e<span>this.instanceField<\/span>\u304c\u6307\u3059\u30d5\u30a3\u30fc\u30eb\u30c9\u306f\u3001\u30b5\u30d6\u30af\u30e9\u30b9\u304b\u3089\u547c\u3073\u51fa\u3055\u308c\u305f\u5834\u5408\u3067\u3082\u30b9\u30fc\u30d1\u30fc\u30af\u30e9\u30b9\u306e\u3082\u306e\u3060\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002<span>Java<\/span>\u3067\u306f\u30d5\u30a3\u30fc\u30eb\u30c9\u306f\u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30ba\u30e0\u306e\u5bfe\u8c61\u3068\u306f\u306a\u3089\u306a\u3044\u304b\u3089\u3067\u3059\u3002<\/p>\n<h2><span id=\"i\">\uff14\uff0e\u307e\u3068\u3081<\/span><\/h2>\n<p>this\u306f\u81ea\u5206\u81ea\u8eab\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u6307\u3059\u5909\u6570\u3067\u3001<span>this()<\/span>\u306f\u81ea\u5206\u81ea\u8eab\u306e\u30af\u30e9\u30b9\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u547c\u3073\u51fa\u3059\u6642\u306b\u4f7f\u3044\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u305d\u308c\u305e\u308c\u306e\u826f\u304f\u3042\u308b\u4f7f\u3044\u65b9\u3001\u6ce8\u610f\u3059\u3079\u304d\u3053\u3068\u3092\u7d39\u4ecb\u3057\u307e\u3057\u305f\u304c\u3001\u3044\u305a\u308c\u3082\u52b9\u679c\u7684\u306b\u4f7f\u3048\u3070\u8aad\u307f\u3084\u3059\u3044\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u308c\u308b\u3082\u306e\u3067\u3059\u3002<\/p>\n<p>\u305d\u3057\u3066\u3001<span>this<\/span>\u306e\u4f7f\u3044\u65b9\u30fb\u8003\u3048\u65b9\u3092\u7a81\u304d\u8a70\u3081\u3066\u3044\u304f\u3068\u3001<span>Java<\/span>\u3067\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u306e\u8003\u3048\u65b9\u304c\u3046\u3063\u3059\u3089\u3068\u898b\u3048\u3066\u304d\u307e\u3059\u3002\u95a2\u9023\u3059\u308b<span>super\/super()<\/span>\u3082\u542b\u3081\u3066\u3057\u3063\u304b\u308a\u3068\u7406\u89e3\u3057\u3066\u3001\u4e00\u3064\u4e0a\u306e\u30ec\u30d9\u30eb\u306e<span>Java<\/span>\u30d7\u30ed\u30b0\u30e9\u30de\u30fc\u3092\u76ee\u6307\u3057\u307e\u3057\u3087\u3046<span>!!<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u3067\u306ethis\u306f\u3001\u4f7f\u308f\u308c\u308b\u7b87\u6240\u306b\u3088\u3063\u3066\u4ee5\u4e0b\u306e\u4e8c\u3064\u306e\u610f\u5473\u304c\u3042\u308a\u307e\u3059\u3002 this\uff1a\u81ea\u5206\u81ea\u8eab\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u6307\u3059\u5909\u6570 this()\uff1a\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u5185\u304b\u3089\u5225\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u547c\u3073\u51fa\u3059\u969b\u306e\u30e1\u30bd\u30c3\u30c9\u540d \u3053\u306e\u8a18\u4e8b\u3067\u306f\u305d\u308c\u305e\u308c\u306e\u8aac [&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\/789"}],"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=789"}],"version-history":[{"count":10,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/posts\/789\/revisions"}],"predecessor-version":[{"id":5679,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/posts\/789\/revisions\/5679"}],"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=789"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/categories?post=789"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}