{"id":2714,"date":"2019-01-03T06:21:39","date_gmt":"2019-01-02T21:21:39","guid":{"rendered":"http:\/\/yucchi.jp\/blog\/?p=2714"},"modified":"2019-01-03T11:41:29","modified_gmt":"2019-01-03T02:41:29","slug":"phantomreference","status":"publish","type":"post","link":"http:\/\/yucchi.jp\/blog\/?p=2714","title":{"rendered":"PhantomReference"},"content":{"rendered":"

\u304a\u6b63\u6708\u4f11\u307f\u3082\u4eca\u65e5\u3067\u7d42\u308f\u3063\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n

\u4f55\u51e6\u306b\u3082\u51fa\u304b\u3051\u305a\u5bb6\u3067\u3054\u308d\u3054\u308d\u3057\u3066\u3044\u307e\u3057\u305f\u3002(^_^;)<\/p>\n

\u5c45\u5834\u6240\u306b\u56f0\u308b\u306e\u3067\u3053\u3046\u3084\u3063\u3066\u30d1\u30bd\u30b3\u30f3\u3067\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u7d44\u3093\u3067\u6642\u9593\u3092\u7121\u99c4\u306b\u4f7f\u3063\u3066\u307e\u3059\u3002<\/p>\n

\u4eca\u65e5\u306f PhantomReference \u3092\u8a66\u3057\u3066\u307f\u307e\u3059\u3002<\/p>\n

\u305d\u306e\u524d\u306b\u524d\u56de\u3001\u524d\u3005\u56de\u3068 PhantomReference \u306e\u5144\u5f1f\u306e SoftReference<\/a> \u3068 WeakReference<\/a> \u306e\u5fa1\u6d5a\u3044\u3092\u3057\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n

SoftReference \u306f\u30ea\u30d5\u30a1\u30ec\u30f3\u30c8\u304c\u30bd\u30d5\u30c8\u5230\u9054\u53ef\u80fd\u3068\u306a\u3063\u3066\u3082\u4f7f\u7528\u983b\u5ea6\u3068\u30d2\u30fc\u30d7\u306e\u72b6\u6cc1\u304b\u3089\u3001\u30ac\u30fc\u30d9\u30fc\u30b8\u30fb\u30b3\u30ec\u30af\u30bf\u304c\u30ea\u30d5\u30a1\u30ec\u30f3\u30c8\u3092\u89e3\u653e\u3059\u3079\u304d\u3060\u3068\u5224\u65ad\u3059\u308b\u307e\u3067 GC \u5bfe\u8c61\u306b\u306a\u3089\u306a\u3044\u3002<\/p>\n

Weak Reference \u306f\u30ea\u30d5\u30a1\u30ec\u30f3\u30c8\u304c\u5f31\u5230\u9054\u53ef\u80fd\u3068\u306a\u3063\u305f\u3089 GC \u5bfe\u8c61\u3068\u306a\u308b\u3002<\/p>\n

\u8a00\u8449\u3067\u306e\u8aac\u660e\u3088\u308a\u7c21\u5358\u306a\u30d7\u30ed\u30b0\u30e9\u30e0\u3068\u7d44\u3093\u3067\u5b9f\u884c\u3057\u3066\u307f\u305f\u307b\u3046\u304c\u7406\u89e3\u3057\u3084\u3059\u3044\u3067\u3059\u3002<\/p>\n

\u3067\u306f\u3001\u975e\u5e38\u306b\u89e3\u308a\u3084\u3059\u3044\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u7d44\u3093\u3067\u307f\u307e\u3057\u305f\u3002<\/p>\n

\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u4e2d\u306b\u3044\u308b\u201d\u307c\u304f\u201d\u306f\u3042\u306a\u305f\u306e\u5834\u5408\u3001SoftReference \u30bf\u30a4\u30d7\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n

\u305d\u308c\u3068\u3082 Weak Reference \u30bf\u30a4\u30d7\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n

 <\/p>\n

\r\npackage jp.yucchi.softlovereference;\r\n\r\nimport java.lang.ref.Reference;\r\nimport java.lang.ref.SoftReference;\r\n\r\n\/**\r\n *\r\n * @author Yucchi\r\n *\/\r\npublic class SoftLoveReference {\r\n\r\n    public static void main(String[] args) {\r\n\r\n        var softLoveReference = new SoftLoveReference();\r\n\r\n        \/\/ suzu \u3092\u30bd\u30d5\u30c8\u5230\u9054\u53ef\u80fd\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u3059\u308b\u3002(boku \u304b\u3089 suzu \u306e\u5f37\u53c2\u7167\u3092\u524a\u9664)\r\n        softLoveReference.boku.suzu = null;\r\n        System.out.println(\"--- \u50d5\u304b\u3089\u3059\u305a\u3078\u306e\u611b\u3092\u7121\u304f\u3057\u305f\u3002 ---\");\r\n\r\n        \/\/ \u30bd\u30d5\u30c8\u5230\u9054\u53ef\u80fd\u3068\u306a\u3063\u305f suzu \u306f\u3059\u3050\u306b\u30ac\u30fc\u30d9\u30b8\u30fb\u30b3\u30ec\u30af\u30c8\u5bfe\u8c61\u3068\u306a\u3089\u305a\u306b\r\n        \/\/ \u30d2\u30fc\u30d7\u306e\u7a7a\u304d\u5bb9\u91cf\u304c\u4e0d\u8db3\u3057\u305f\u3068\u304d\u306b\u56de\u53ce\u5bfe\u8c61\u3068\u306a\u308b\u3002\r\n        System.gc();\r\n\r\n        \/\/ \u30ea\u30d5\u30a1\u30ec\u30f3\u30c8\u3092\u53d6\u5f97\r\n        var love = softLoveReference.boku.yui.suzu;\r\n        if (love.get() != null) {\r\n            \/\/ \u30bd\u30d5\u30c8\u5230\u9054\u53ef\u80fd\u30aa\u30d6\u30b8\u30a7\u30af\u30c8 suzu \u306f\u307e\u3060\u6d88\u3048\u3066\u3044\u306a\u3044\u3002\r\n            love.get().isLove();\r\n            \/\/ \u30ea\u30d5\u30a1\u30ec\u30f3\u30c8\u3092\u30af\u30ea\u30a2\u3059\u308b\u3002\r\n            love.clear();\r\n            if (love.get() == null) {\r\n                \/\/ \u30bd\u30d5\u30c8\u5230\u9054\u53ef\u80fd\u30aa\u30d6\u30b8\u30a7\u30af\u30c8 suzu \u306f\u6d88\u3048\u3066\u3044\u308b\u3002\r\n                System.out.println(\"\u30ac\u30c3\u30ad\u30fc\u3001\u4eca\u307e\u3067\u3054\u3081\u3093\u306d\u3002\u50d5\u306e\u3059\u305a\u3078\u306e\u611b\u306f\u5b8c\u5168\u306b\u6d88\u3048\u305f\u3002\" + System.lineSeparator()\r\n                        + \"\u3053\u308c\u304b\u3089\u306f\u30ac\u30c3\u30ad\u30fc\u304a\u524d\u3060\u3051\u3092\u611b\u3059\u308b\uff01\");\r\n            }\r\n        } else {\r\n            \/\/ \u30bd\u30d5\u30c8\u5230\u9054\u53ef\u80fd\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u6d88\u3048\u3066\u3044\u308b\u3002\r\n            System.out.println(\"\u50d5\u306e\u3059\u305a\u3078\u306e\u611b\u306f\u5b8c\u5168\u306b\u6d88\u3048\u305f\u3002\");\r\n        }\r\n\r\n    }\r\n\r\n    Boku boku;\r\n\r\n    public SoftLoveReference() {\r\n        boku = new Boku();\r\n        boku.yui = new Yui();\r\n        boku.suzu = new Suzu();\r\n        \/\/ yui \u304b\u3089 suzu \u306f\u30bd\u30d5\u30c8\u53c2\u7167\r\n        boku.yui.suzu = new SoftReference<>(boku.suzu);\r\n    }\r\n\r\n    private static class Boku {\r\n\r\n        Boku() {\r\n            System.out.println(\"\u50d5\u306f\u4e8c\u4eba\u306e\u7d20\u6575\u306a\u5973\u6027\u3092\u611b\u3057\u3066\u3057\u307e\u3063\u305f\u3002\");\r\n        }\r\n\r\n        Yui yui;\r\n        Suzu suzu;\r\n\r\n    }\r\n\r\n    private static class Yui {\r\n\r\n        Yui() {\r\n            System.out.println(\"\u50d5\u306f\u30ac\u30c3\u30ad\u30fc\u3092\u611b\u3057\u3066\u308b\u3002\");\r\n        }\r\n\r\n        \/\/ \u53c2\u7167\u578b\u30d5\u30a3\u30fc\u30eb\u30c9\r\n        Reference<Suzu> suzu = null;\r\n\r\n    }\r\n\r\n    private static class Suzu {\r\n\r\n        Suzu() {\r\n            System.out.println(\"\u50d5\u306f\u3059\u305a\u3092\u611b\u3057\u3066\u308b\u3002\");\r\n        }\r\n\r\n        void isLove() {\r\n            System.out.println(\"\u3054\u3081\u3093\u306d\u3002\u30ac\u30c3\u30ad\u30fc\u30fb\u30fb\u30fb\u3000\u50d5\u306e\u3059\u305a\u3078\u306e\u611b\u306f\u307e\u3060\u5b8c\u5168\u306b\u6d88\u3048\u3066\u3044\u306a\u3044\u3002\");\r\n        }\r\n\r\n    }\r\n\r\n}\r\n\r\n<\/code><\/pre>\n
 <\/p>\n
\u3053\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u5b9f\u884c\u7d50\u679c\u306f\u3064\u304e\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u50d5\u306f\u4e8c\u4eba\u306e\u7d20\u6575\u306a\u5973\u6027\u3092\u611b\u3057\u3066\u3057\u307e\u3063\u305f\u3002
\u50d5\u306f\u30ac\u30c3\u30ad\u30fc\u3092\u611b\u3057\u3066\u308b\u3002
\u50d5\u306f\u3059\u305a\u3092\u611b\u3057\u3066\u308b\u3002
— \u50d5\u304b\u3089\u3059\u305a\u3078\u306e\u611b\u3092\u7121\u304f\u3057\u305f\u3002 —
\u3054\u3081\u3093\u306d\u3002\u30ac\u30c3\u30ad\u30fc\u30fb\u30fb\u30fb\u3000\u50d5\u306e\u3059\u305a\u3078\u306e\u611b\u306f\u307e\u3060\u5b8c\u5168\u306b\u6d88\u3048\u3066\u3044\u306a\u3044\u3002
\u30ac\u30c3\u30ad\u30fc\u3001\u4eca\u307e\u3067\u3054\u3081\u3093\u306d\u3002\u50d5\u306e\u3059\u305a\u3078\u306e\u611b\u306f\u5b8c\u5168\u306b\u6d88\u3048\u305f\u3002
\u3053\u308c\u304b\u3089\u306f\u30ac\u30c3\u30ad\u30fc\u304a\u524d\u3060\u3051\u3092\u611b\u3059\u308b\uff01<\/font><\/p>\n
\u6b21\u306f Weak Reference \u3092\u4f7f\u3063\u305f\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u3059\u3002<\/p>\n
 <\/p>\n
\r\npackage jp.yucchi.weaklovereference;\r\n\r\nimport java.lang.ref.Reference;\r\nimport java.lang.ref.WeakReference;\r\n\r\n\/**\r\n *\r\n * @author Yucchi\r\n *\/\r\npublic class WeakLoveReference {\r\n\r\n    public static void main(String[] args) {\r\n\r\n        var weakLoveReference = new WeakLoveReference();\r\n\r\n        \/\/ suzu \u3092\u5f31\u5230\u9054\u53ef\u80fd\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u3059\u308b\u3002(boku \u304b\u3089 suzu \u306e\u5f37\u53c2\u7167\u3092\u524a\u9664)\r\n        weakLoveReference.boku.suzu = null;\r\n        System.out.println(\"--- \u50d5\u304b\u3089\u3059\u305a\u3078\u306e\u611b\u3092\u7121\u304f\u3057\u305f\u3002 ---\");\r\n\r\n        \/\/ \u5f31\u5230\u9054\u53ef\u80fd\u3068\u306a\u3063\u305f suzu \u306f\u30ac\u30fc\u30d9\u30b8\u30fb\u30b3\u30ec\u30af\u30c8\u306e\u56de\u53ce\u4f53\u5236\u3068\u306a\u308b\u3002\r\n        System.gc();\r\n\r\n        \/\/ \u30ea\u30d5\u30a1\u30ec\u30f3\u30c8\u3092\u53d6\u5f97\r\n        var love = weakLoveReference.boku.yui.suzu;\r\n        \/\/ \u5f31\u5230\u9054\u53ef\u80fd\u30aa\u30d6\u30b8\u30a7\u30af\u30c8 suzu \u306f\u6d88\u3048\u3066\u3044\u308b\u3002\r\n        if (love.get() != null) { \/\/ true \u306e\u90e8\u5206\u306f\u5b9f\u884c\u3055\u308c\u308b\u3053\u3068\u306f\u306a\u3044\u3002      \r\n            love.get().isLove();\r\n            love.clear();\r\n            if (love.get() == null) {\r\n                System.out.println(\"\u30ac\u30c3\u30ad\u30fc\u3001\u4eca\u307e\u3067\u3054\u3081\u3093\u306d\u3002\u50d5\u306e\u3059\u305a\u3078\u306e\u611b\u306f\u5b8c\u5168\u306b\u6d88\u3048\u305f\u3002\" + System.lineSeparator()\r\n                        + \"\u3053\u308c\u304b\u3089\u306f\u30ac\u30c3\u30ad\u30fc\u304a\u524d\u3060\u3051\u3092\u611b\u3059\u308b\uff01\");\r\n            }\r\n        } else {\r\n            \/\/ \u5f31\u5230\u9054\u53ef\u80fd\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u6d88\u3048\u3066\u3044\u308b\u3002\r\n            System.out.println(\"\u50d5\u306e\u3059\u305a\u3078\u306e\u611b\u306f\u5b8c\u5168\u306b\u6d88\u3048\u305f\u3002\u3000\u30ac\u30c3\u30ad\u30fc\u3001\u611b\u3057\u3066\u308b\uff01\");\r\n        }\r\n\r\n    }\r\n\r\n    Boku boku;\r\n\r\n    public WeakLoveReference() {\r\n        boku = new Boku();\r\n        boku.yui = new Yui();\r\n        boku.suzu = new Suzu();\r\n        \/\/ yui \u304b\u3089 suzu \u5f31\u53c2\u7167\r\n        boku.yui.suzu = new WeakReference<>(boku.suzu);\r\n    }\r\n\r\n    private static class Boku {\r\n\r\n        Boku() {\r\n            System.out.println(\"\u50d5\u306f\u4e8c\u4eba\u306e\u7d20\u6575\u306a\u5973\u6027\u3092\u611b\u3057\u3066\u3057\u307e\u3063\u305f\u3002\");\r\n        }\r\n\r\n        Yui yui;\r\n        Suzu suzu;\r\n\r\n    }\r\n\r\n    private static class Yui {\r\n\r\n        Yui() {\r\n            System.out.println(\"\u50d5\u306f\u30ac\u30c3\u30ad\u30fc\u3092\u611b\u3057\u3066\u308b\u3002\");\r\n        }\r\n\r\n        \/\/ \u53c2\u7167\u578b\u30d5\u30a3\u30fc\u30eb\u30c9\r\n        Reference<Suzu> suzu = null;\r\n\r\n    }\r\n\r\n    private static class Suzu {\r\n\r\n        Suzu() {\r\n            System.out.println(\"\u50d5\u306f\u3059\u305a\u3092\u611b\u3057\u3066\u308b\u3002\");\r\n        }\r\n\r\n        void isLove() {\r\n            System.out.println(\"\u3054\u3081\u3093\u306d\u3002\u30ac\u30c3\u30ad\u30fc\u30fb\u30fb\u30fb\u3000\u50d5\u306e\u3059\u305a\u3078\u306e\u611b\u306f\u307e\u3060\u5b8c\u5168\u306b\u6d88\u3048\u3066\u3044\u306a\u3044\u3002\");\r\n        }\r\n\r\n    }\r\n\r\n}\r\n\r\n<\/code><\/pre>\n
\u3053\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u5b9f\u884c\u7d50\u679c\u306f\u3064\u304e\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u50d5\u306f\u4e8c\u4eba\u306e\u7d20\u6575\u306a\u5973\u6027\u3092\u611b\u3057\u3066\u3057\u307e\u3063\u305f\u3002
\u50d5\u306f\u30ac\u30c3\u30ad\u30fc\u3092\u611b\u3057\u3066\u308b\u3002
\u50d5\u306f\u3059\u305a\u3092\u611b\u3057\u3066\u308b\u3002
— \u50d5\u304b\u3089\u3059\u305a\u3078\u306e\u611b\u3092\u7121\u304f\u3057\u305f\u3002 —
\u50d5\u306e\u3059\u305a\u3078\u306e\u611b\u306f\u5b8c\u5168\u306b\u6d88\u3048\u305f\u3002\u3000\u30ac\u30c3\u30ad\u30fc\u3001\u611b\u3057\u3066\u308b\uff01<\/font><\/p>\n
\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u8a73\u7d30\u306f\u30b3\u30e1\u30f3\u30c8\u3068\u524d\u56de\u3001\u524d\u3005\u56de\u306e\u30a8\u30f3\u30c8\u30ea\u30fc\u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044\u307e\u305b\u3002<\/p>\n
\u3055\u3066\u3001\u3042\u306a\u305f\u306f\u3069\u3061\u3089\u306e\u30bf\u30a4\u30d7\u3067\u3057\u305f\u3067\u3057\u3087\u3046\uff1f<\/p>\n
\u305d\u308c\u3067\u306f PhantomReference \u3092\u8a66\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff01<\/p>\n
PhantomReference \u3092\u4f7f\u3046\u306b\u306f \u30e2\u30b8\u30e5\u30fc\u30eb java.base \u306e java.lang.Object java.lang.ref.ReferenceQueue<T> \u30af\u30e9\u30b9\u304c\u5fc5\u8981\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u305d\u3046\u3044\u3048\u3070\u3001\u30e2\u30b8\u30e5\u30fc\u30eb java.base \u306e java.lang.Object java.lang.ref.Reference<T> \u306e\u3053\u3068\u3082\u5fd8\u308c\u3066\u3044\u305f\u306e\u3067\u3053\u308c\u3089\u3092\u5148\u306b\u3056\u3063\u304f\u308a\u3068\u8abf\u3079\u307e\u3059\u3002<\/p>\n
\u53c2\u7167\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u305f\u3081\u306e\u62bd\u8c61\u57fa\u5e95\u30af\u30e9\u30b9\u3067\u3042\u308b Reference<T> \u30af\u30e9\u30b9\u304b\u3089\u8abf\u3079\u307e\u3059\u3002<\/p>\n
\u30af\u30e9\u30b9<\/font>Reference<T> <\/font><\/strong><\/p>\n
\u3053\u306e\u30af\u30e9\u30b9\u306f\u3001\u3059\u3079\u3066\u306e\u53c2\u7167\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5bfe\u3057\u3066\u5171\u901a\u306e\u30aa\u30da\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002<\/font><\/p>\n
\u53c2\u7167\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u30ac\u30d9\u30fc\u30b8\u30fb\u30b3\u30ec\u30af\u30bf\u3068\u5bc6\u63a5\u306b\u9023\u643a\u3057\u3066\u5b9f\u88c5\u3055\u308c\u308b\u306e\u3067\u3001\u3053\u306e\u30af\u30e9\u30b9\u3092\u76f4\u63a5\u30b5\u30d6\u30af\u30e9\u30b9\u5316\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002<\/font><\/p>\n
\u30e1\u30bd\u30c3\u30c9\u306f\uff16\u500b\u3042\u308a\u307e\u3059\u3002<\/p>\n
public void clear()<\/strong><\/font><\/p>\n
\u3053\u306e\u53c2\u7167\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u30af\u30ea\u30a2\u3057\u307e\u3059\u3002 \u3053\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u3066\u3082\u3001\u3053\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u30ad\u30e5\u30fc\u306b\u5165\u308a\u307e\u305b\u3093\u3002 <\/font><\/p>\n
\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306fJava\u30b3\u30fc\u30c9\u306b\u3088\u3063\u3066\u306e\u307f\u547c\u3073\u51fa\u3055\u308c\u307e\u3059\u3002\u30ac\u30d9\u30fc\u30b8\u30fb\u30b3\u30ec\u30af\u30bf\u304c\u53c2\u7167\u3092\u30af\u30ea\u30a2\u3059\u308b\u3068\u304d\u306f\u3001\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3055\u305a\u306b\u76f4\u63a5\u884c\u3044\u307e\u3059\u3002<\/font><\/p>\n
protected Object clone()throws CloneNotSupportedException<\/font><\/p>\n
\u5e38\u6642 CloneNotSupportedException\u3092\u30b9\u30ed\u30fc\u3057\u307e\u3059\u3002 Reference\u306f\u3001\u52b9\u679c\u7684\u306b\u30af\u30ed\u30fc\u30cb\u30f3\u30b0\u3067\u304d\u307e\u305b\u3093\u3002 \u304b\u308f\u308a\u306b\u65b0\u898f\u306eReference\u3092\u69cb\u7bc9\u3057\u307e\u3059<\/font>\u3002 <\/p>\n
public boolean enqueue()<\/font><\/strong><\/p>\n
\u3053\u306e\u53c2\u7167\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u30af\u30ea\u30a2\u3057\u3001\u305d\u308c\u304c\u767b\u9332\u3055\u308c\u3066\u3044\u308b\u30ad\u30e5\u30fc\u306b\u767b\u9332\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u8ffd\u52a0\u3057\u307e\u3059\u3002 <\/font><\/p>\n
\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306fJava\u30b3\u30fc\u30c9\u306b\u3088\u3063\u3066\u306e\u307f\u547c\u3073\u51fa\u3055\u308c\u307e\u3059\u3002\u30ac\u30d9\u30fc\u30b8\u30fb\u30b3\u30ec\u30af\u30bf\u304c\u53c2\u7167\u3092\u30ad\u30e5\u30fc\u306b\u5165\u308c\u308b\u3068\u304d\u306f\u3001\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3055\u305a\u306b\u76f4\u63a5\u884c\u3044\u307e\u3059\u3002<\/font><\/p>\n
\u623b\u308a\u5024:\u3053\u306e\u53c2\u7167\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u30ad\u30e5\u30fc\u306b\u5165\u308c\u3089\u308c\u305f\u5834\u5408\u306ftrue\u3002\u3059\u3067\u306b\u30ad\u30e5\u30fc\u306b\u5165\u308c\u3089\u308c\u3066\u3044\u308b\u304b\u3001\u4f5c\u6210\u6642\u306b\u30ad\u30e5\u30fc\u306b\u767b\u9332\u3055\u308c\u306a\u304b\u3063\u305f\u5834\u5408\u306ffalse<\/font><\/p>\n
public T get()<\/font><\/strong><\/p>\n
\u53c2\u7167\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30ea\u30d5\u30a1\u30ec\u30f3\u30c8\u3092\u8fd4\u3057\u307e\u3059\u3002 \u30d7\u30ed\u30b0\u30e9\u30e0\u307e\u305f\u306f\u30ac\u30d9\u30fc\u30b8\u30fb\u30b3\u30ec\u30af\u30bf\u306b\u3088\u3063\u3066\u3001\u3053\u306e\u53c2\u7167\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u3059\u3067\u306b\u30af\u30ea\u30a2\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u3001\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306fnull\u3092\u8fd4\u3057\u307e\u3059\u3002 <\/font><\/p>\n
\u623b\u308a\u5024:\u3053\u306e\u53c2\u7167\u304c\u8868\u3059\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3002\u3053\u306e\u53c2\u7167\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u30af\u30ea\u30a2\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u306fnull<\/font><\/p>\n
public boolean isEnqueued()<\/strong><\/font><\/p>\n
\u3053\u306e\u53c2\u7167\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u307e\u305f\u306f\u30ac\u30d9\u30fc\u30b8\u30fb\u30b3\u30ec\u30af\u30bf\u306b\u3088\u3063\u3066\u30ad\u30e5\u30fc\u306b\u5165\u308c\u3089\u308c\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3092\u5224\u5b9a\u3057\u307e\u3059\u3002 <\/font><\/p>\n
\u3053\u306e\u53c2\u7167\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u751f\u6210\u3055\u308c\u305f\u3068\u304d\u306b\u30ad\u30e5\u30fc\u306b\u767b\u9332\u3055\u308c\u3066\u3044\u306a\u3044\u5834\u5408\u3001\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u5e38\u306bfalse\u3092\u8fd4\u3057\u307e\u3059\u3002 <\/font><\/p>\n
\u623b\u308a\u5024:\u3053\u306e\u53c2\u7167\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u30ad\u30e5\u30fc\u306b\u5165\u308c\u3089\u308c\u3066\u3044\u308b\u5834\u5408\u306b\u3060\u3051true<\/font><\/p>\n
public static void reachabilityFence\u200b(Object ref)<\/strong><\/font><\/p>\n
\u6307\u5b9a\u3055\u308c\u305f\u53c2\u7167\u306b\u3088\u3063\u3066\u53c2\u7167\u3055\u308c\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u5230\u9054\u4e0d\u80fd\u306b\u306a\u308b\u53ef\u80fd\u6027\u306e\u3042\u308b\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u4ee5\u524d\u306e\u30a2\u30af\u30b7\u30e7\u30f3\u306b\u95a2\u4fc2\u306a\u304f\u3001\u300c\u5f37\u304f\u5230\u9054\u53ef\u80fd\u306a\u300d\u306e\u307e\u307e\u3067\u3042\u308b\u3053\u3068\u3092\u4fdd\u8a3c\u3057\u307e\u3059\u3002<\/font><\/p>\n
\u3053\u306e\u305f\u3081\u3001\u53c2\u7167\u3055\u308c\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u3001\u5c11\u306a\u304f\u3068\u3082\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u547c\u3073\u51fa\u3055\u308c\u308b\u307e\u3067\u30ac\u30d9\u30fc\u30b8\u30fb\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306b\u3088\u3063\u3066\u518d\u8981\u6c42\u3067\u304d\u307e\u305b\u3093<\/font>\u3002<\/p>\n
\u6b21\u306f\u30e2\u30b8\u30e5\u30fc\u30eb java.base \u306e java.lang.Object java.lang.ref.ReferenceQueue<T> \u3092\u8abf\u3079\u3066\u307f\u307e\u3059\u3002<\/p>\n
\u30af\u30e9\u30b9ReferenceQueue<T><\/font><\/strong><\/p>\n
\u53c2\u7167\u30ad\u30e5\u30fc\u3067\u3059\u3002\u5230\u9054\u53ef\u80fd\u6027\u304c\u9069\u5207\u306b\u5909\u66f4\u3055\u308c\u305f\u3053\u3068\u304c\u691c\u51fa\u3055\u308c\u308b\u3068\u3001\u767b\u9332\u3055\u308c\u3066\u3044\u308b\u53c2\u7167\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u30ac\u30d9\u30fc\u30b8\u30fb\u30b3\u30ec\u30af\u30bf\u306b\u3088\u3063\u3066\u53c2\u7167\u30ad\u30e5\u30fc\u306b\u8ffd\u52a0\u3055\u308c\u307e\u3059\u3002<\/font><\/p>\n
\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306f\u5f15\u6570\u306e\u7121\u3044\u3082\u306e\u304c\u4e00\u3064\u3060\u3051\u3042\u308a\u307e\u3059\u3002<\/p>\n
public ReferenceQueue()<\/strong><\/font><\/p>\n
\u65b0\u3057\u3044\u53c2\u7167\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u30fb\u30ad\u30e5\u30fc\u3092\u69cb\u7bc9\u3057\u307e\u3059\u3002<\/font><\/p>\n
\u30e1\u30bd\u30c3\u30c9\u306f\uff13\u500b\u3042\u308a\u307e\u3059\u3002<\/p>\n
public Reference<? extends T> poll()<\/font><\/strong><\/p>\n
\u3053\u306e\u30ad\u30e5\u30fc\u3092\u30dd\u30fc\u30ea\u30f3\u30b0\u3057\u3066\u3001\u53c2\u7167\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u5229\u7528\u53ef\u80fd\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002 <\/font><\/p>\n
\u53c2\u7167\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u9045\u5ef6\u306a\u3057\u3067\u5229\u7528\u53ef\u80fd\u306a\u5834\u5408\u3001\u305d\u308c\u304c\u30ad\u30e5\u30fc\u304b\u3089\u524a\u9664\u3055\u308c\u3066\u3001\u8fd4\u3055\u308c\u307e\u3059\u3002 \u305d\u308c\u4ee5\u5916\u306e\u5834\u5408\u3001\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u5373\u5ea7\u306bnull\u3092\u8fd4\u3057\u307e\u3059\u3002 <\/font><\/p>\n
\u623b\u308a\u5024:\u5229\u7528\u53ef\u80fd\u306a\u53c2\u7167\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u3042\u3063\u305f\u5834\u5408\u306f\u305d\u306e\u53c2\u7167\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3001\u305d\u3046\u3067\u306a\u3044\u5834\u5408\u306fnull<\/font><\/p>\n
public Reference<? extends T> remove()throws InterruptedException<\/font><\/strong><\/p>\n
\u3053\u306e\u30ad\u30e5\u30fc\u306e\u6b21\u306e\u53c2\u7167\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u524a\u9664\u3057\u307e\u3059\u3002\u53c2\u7167\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u5229\u7528\u53ef\u80fd\u306b\u306a\u308b\u307e\u3067\u30d6\u30ed\u30c3\u30af\u3055\u308c\u307e\u3059\u3002<\/font><\/p>\n
\u623b\u308a\u5024:\u53c2\u7167\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u30021\u3064\u304c\u5229\u7528\u53ef\u80fd\u306b\u306a\u308b\u307e\u3067\u30d6\u30ed\u30c3\u30af\u3092\u884c\u3046<\/font><\/p>\n
\u4f8b\u5916:InterruptedException – \u5f85\u6a5f\u4e2d\u306b\u5272\u308a\u8fbc\u307e\u308c\u305f\u5834\u5408<\/font><\/p>\n
public Reference<? extends T> remove\u200b(long timeout)throws IllegalArgumentException, InterruptedException<\/strong><\/font><\/p>\n
\u3053\u306e\u30ad\u30e5\u30fc\u306e\u6b21\u306e\u53c2\u7167\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u524a\u9664\u3057\u307e\u3059\u3002\u53c2\u7167\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u5229\u7528\u53ef\u80fd\u306b\u306a\u308b\u304b\u3001\u6307\u5b9a\u3055\u308c\u305f\u30bf\u30a4\u30e0\u30fb\u30a2\u30a6\u30c8\u306e\u671f\u9650\u304c\u5207\u308c\u308b\u307e\u3067\u30d6\u30ed\u30c3\u30af\u3057\u307e\u3059\u3002 <\/font><\/p>\n
\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u30ea\u30a2\u30eb\u30bf\u30a4\u30e0\u4fdd\u8a3c\u3092\u884c\u3044\u307e\u305b\u3093\u3002Object.wait(long)\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u305f\u5834\u5408\u3068\u540c\u69d8\u306b\u30bf\u30a4\u30e0\u30fb\u30a2\u30a6\u30c8\u306e\u30b9\u30b1\u30b8\u30e5\u30fc\u30eb\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/font><\/p>\n
\u30d1\u30e9\u30e1\u30fc\u30bf:timeout – \u5024\u304c\u6b63\u306e\u5834\u5408\u3001\u3053\u306e\u30ad\u30e5\u30fc\u306b\u53c2\u7167\u304c\u8ffd\u52a0\u3055\u308c\u308b\u306e\u3092\u5f85\u3064\u9593\u3001timeout\u30df\u30ea\u79d2\u306e\u9593\u30d6\u30ed\u30c3\u30af\u3055\u308c\u308b\u3002 0\u306e\u5834\u5408\u3001\u7121\u671f\u9650\u306b\u30d6\u30ed\u30c3\u30af\u3055\u308c\u308b\u3002 <\/font><\/p>\n
\u623b\u308a\u5024:\u6307\u5b9a\u3055\u308c\u305f\u30bf\u30a4\u30e0\u30fb\u30a2\u30a6\u30c8\u671f\u9593\u306b\u5229\u7528\u53ef\u80fd\u306b\u306a\u3063\u305f\u5834\u5408\u306f\u53c2\u7167\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3001\u305d\u3046\u3067\u306a\u3044\u5834\u5408\u306fnull<\/font><\/p>\n
\u4f8b\u5916:IllegalArgumentException – timeout\u5f15\u6570\u306e\u5024\u304c\u8ca0\u306e\u5834\u5408
InterruptedException – \u30bf\u30a4\u30e0\u30fb\u30a2\u30a6\u30c8\u5f85\u6a5f\u4e2d\u306b\u5272\u308a\u8fbc\u307e\u308c\u305f\u5834\u5408<\/font><\/p>\n
\u305d\u308c\u3067\u306f\u6b21\u306f\u30e2\u30b8\u30e5\u30fc\u30eb java.base \u306e java.lang.Object java.lang.ref.Reference<T> java.lang.ref.PhantomReference<T> \u30af\u30e9\u30b9\u3092\u8abf\u3079\u307e\u3059\u3002<\/p>\n
\u30af\u30e9\u30b9PhantomReference<T><\/strong><\/font><\/p>\n
\u30d5\u30a1\u30f3\u30c8\u30e0\u53c2\u7167\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3059\u3002\u30d5\u30a1\u30f3\u30c8\u30e0\u53c2\u7167\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u30ad\u30e5\u30fc\u306b\u5165\u308c\u3089\u308c\u308b\u306e\u306f\u3001\u30ad\u30e5\u30fc\u306b\u5165\u308c\u3066\u304a\u304b\u306a\u3044\u3068\u305d\u308c\u3089\u306e\u30ea\u30d5\u30a1\u30ec\u30f3\u30c8\u304c\u518d\u751f\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3068\u30b3\u30ec\u30af\u30bf\u304c\u5224\u65ad\u3057\u305f\u3068\u304d\u3067\u3059\u3002 <\/font><\/p>\n
\u5e7b\u306e\u53c2\u7167\u306f\u3001\u6b7b\u5f8c\u306e\u30af\u30ea\u30fc\u30f3\u30a2\u30c3\u30d7\u30fb\u30a2\u30af\u30b7\u30e7\u30f3\u3092\u30b9\u30b1\u30b8\u30e5\u30fc\u30eb\u3059\u308b\u305f\u3081\u306b\u6700\u3082\u983b\u7e41\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002 <\/font><\/p>\n
\u3042\u308b\u6642\u70b9\u3067\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u300c\u30d5\u30a1\u30f3\u30c8\u30e0\u5230\u9054\u53ef\u80fd\u300d\u3067\u3042\u308b\u3068\u30ac\u30d9\u30fc\u30b8\u30fb\u30b3\u30ec\u30af\u30bf\u304c\u5224\u65ad\u3057\u305f\u3068\u3057\u307e\u3059\u3002 <\/font><\/p>\n
\u305d\u306e\u6642\u70b9\u3067\u3001\u305d\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3078\u306e\u3059\u3079\u3066\u306e\u30d5\u30a1\u30f3\u30c8\u30e0\u53c2\u7167\u3068\u3001\u305d\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5230\u9054\u53ef\u80fd\u306a\u4ed6\u306e\u30d5\u30a1\u30f3\u30c8\u30e0\u5230\u9054\u53ef\u80fd\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3078\u306e\u3059\u3079\u3066\u306e\u30d5\u30a1\u30f3\u30c8\u30e0\u53c2\u7167\u3092\u539f\u5b50\u7684\u306b\u30af\u30ea\u30a2\u3057\u307e\u3059\u3002 <\/font><\/p>\n
\u540c\u6642\u306b\u3001\u307e\u305f\u306f\u5f8c\u3067\u3001\u53c2\u7167\u30ad\u30e5\u30fc\u306b\u767b\u9332\u3055\u308c\u305f\u305d\u308c\u3089\u306e\u65b0\u305f\u306b\u30af\u30ea\u30a2\u3055\u308c\u305f\u30d5\u30a1\u30f3\u30c8\u30e0\u53c2\u7167\u3092\u30a8\u30f3\u30ad\u30e5\u30fc\u3057\u307e\u3059\u3002 <\/font><\/p>\n
\u518d\u751f\u53ef\u80fd\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u305d\u306e\u307e\u307e\u306b\u3057\u3066\u304a\u304f\u305f\u3081\u306b\u3001\u30d5\u30a1\u30f3\u30c8\u30e0\u53c2\u7167\u306e\u30ea\u30d5\u30a1\u30ec\u30f3\u30c8\u3092\u53d6\u308a\u51fa\u3059\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u30d5\u30a1\u30f3\u30c8\u30e0\u53c2\u7167\u306eget\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u5e38\u306bnull\u3092\u8fd4\u3057\u307e\u3059\u3002<\/font><\/p>\n
\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306f\u5f15\u6570\u3092\u4e8c\u3064\u53d6\u308b\u3082\u306e\u304c\u4e00\u3064\u3060\u3051\u3042\u308a\u307e\u3059\u3002<\/p>\n
public PhantomReference\u200b(T referent, ReferenceQueue<? super T> q)<\/font><\/strong><\/p>\n
\u6307\u5b9a\u3055\u308c\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u53c2\u7167\u3057\u3001\u6307\u5b9a\u3055\u308c\u305f\u30ad\u30e5\u30fc\u306b\u767b\u9332\u3055\u308c\u3066\u3044\u308b\u65b0\u3057\u3044\u30d5\u30a1\u30f3\u30c8\u30e0\u53c2\u7167\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002 <\/font><\/p>\n
null\u30ad\u30e5\u30fc\u3067\u30d5\u30a1\u30f3\u30c8\u30e0\u30fb\u30ea\u30d5\u30a1\u30ec\u30f3\u30b9\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u306f\u53ef\u80fd\u3067\u3059\u304c\u3001\u305d\u306e\u3088\u3046\u306a\u30ea\u30d5\u30a1\u30ec\u30f3\u30b9\u306f\u307e\u3063\u305f\u304f\u5f79\u306b\u7acb\u305f\u306a\u3044: \u305d\u306eget\u30e1\u30bd\u30c3\u30c9\u306f\u5e38\u306bnull\u3092\u8fd4\u3057\u3001\u30ad\u30e5\u30fc\u3092\u6301\u305f\u306a\u3044\u306e\u3067\u30a8\u30f3\u30ad\u30e5\u30fc\u3055\u308c\u307e\u305b\u3093\u3002<\/font><\/p>\n
\u30d1\u30e9\u30e1\u30fc\u30bf:referent – \u65b0\u3057\u3044\u30d5\u30a1\u30f3\u30c8\u30e0\u53c2\u7167\u304c\u53c2\u7167\u3059\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8
q – \u53c2\u7167\u304c\u767b\u9332\u3055\u308c\u308b\u30ad\u30e5\u30fc\u3002\u767b\u9332\u304c\u5fc5\u8981\u306a\u3044\u5834\u5408\u306fnull<\/font><\/p>\n
\u30e1\u30bd\u30c3\u30c9\u306f\u4e00\u3064\u3060\u3051\u3042\u308a\u307e\u3059\u3002<\/p>\n
public T get()<\/font><\/strong><\/p>\n
\u53c2\u7167\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30ea\u30d5\u30a1\u30ec\u30f3\u30c8\u3092\u8fd4\u3057\u307e\u3059\u3002 <\/font><\/p>\n
\u30d5\u30a1\u30f3\u30c8\u30e0\u53c2\u7167\u306e\u30ea\u30d5\u30a1\u30ec\u30f3\u30c8\u306f\u5e38\u306b\u30a2\u30af\u30bb\u30b9\u4e0d\u53ef\u80fd\u306a\u305f\u3081\u3001\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u5e38\u306bnull\u3092\u8fd4\u3057\u307e\u3059\u3002 <\/font><\/p>\n
\u623b\u308a\u5024:null<\/font><\/p>\n
\u3053\u308c\u3067 PhantomReference \u3092\u4f7f\u3046\u305f\u3081\u306e API \u3092\u307f\u3066\u307f\u307e\u3057\u305f\u3002<\/p>\n
\u3068\u3001\u601d\u3044\u304d\u3084 JDK 9 \u304b\u3089 java.\u200blang.\u200bObject protected void finalize() throws Throwable \u304c Deprecated \u306b\u306a\u3063\u3066\u3057\u307e\u3044\u307e\u3057\u305f\u3002<\/p>\n
\u4ee3\u308f\u308a\u306b\u30e2\u30b8\u30e5\u30fc\u30eb java.base \u306e java.lang.Object java.lang.ref.Cleaner \u30af\u30e9\u30b9\u3092\u4f7f\u3046\u3053\u3068\u304c\u63a8\u5968\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u3053\u3061\u3089\u3082\u3056\u3063\u304f\u308a\u3068\u307f\u3066\u307f\u307e\u3059\u3002<\/p>\n
\u30af\u30e9\u30b9Cleaner<\/font><\/strong><\/p>\n
Cleaner\u306f\u3001\u4e00\u9023\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u53c2\u7167\u3068\u5bfe\u5fdc\u3059\u308b\u30af\u30ea\u30fc\u30cb\u30f3\u30b0\u30fb\u30a2\u30af\u30b7\u30e7\u30f3\u3092\u7ba1\u7406\u3057\u307e\u3059\u3002 <\/font><\/p>\n
\u30af\u30ea\u30fc\u30ca\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u6709\u7dda\u3067\u5230\u9054\u53ef\u80fd\u306b\u306a\u3063\u305f\u3053\u3068\u304c\u30af\u30ea\u30fc\u30ca\u306b\u901a\u77e5\u3055\u308c\u305f\u5f8c\u3067\u5b9f\u884c\u3059\u308b\u305f\u3081\u306b\u3001\u30af\u30ea\u30fc\u30cb\u30f3\u30b0\u52d5\u4f5c\u306fregistered\u3067\u3059\u3002 <\/font><\/p>\n
\u30af\u30ea\u30fc\u30ca\u306f\u3001PhantomReference\u3068ReferenceQueue\u3092\u4f7f\u7528\u3057\u3066\u3001reachability\u304c\u5909\u66f4\u3055\u308c\u305f\u3068\u304d\u306b\u901a\u77e5\u3092\u53d7\u3051\u53d6\u308a\u307e\u3059\u3002 <\/font><\/p>\n
\u5404\u30af\u30ea\u30fc\u30ca\u306f\u3001\u72ec\u7acb\u3057\u3066\u52d5\u4f5c\u3057\u3001\u4fdd\u7559\u4e2d\u306e\u30af\u30ea\u30fc\u30cb\u30f3\u30b0\u52d5\u4f5c\u3092\u7ba1\u7406\u3057\u3001\u30af\u30ea\u30fc\u30ca\u304c\u3059\u3067\u306b\u4f7f\u7528\u3055\u308c\u3066\u3044\u306a\u3044\u3068\u304d\u306b\u30b9\u30ec\u30c3\u30c9\u304a\u3088\u3073\u7d42\u4e86\u3092\u51e6\u7406\u3057\u307e\u3059\u3002 <\/font><\/p>\n
\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u53c2\u7167\u3068\u5bfe\u5fdc\u3059\u308b\u30af\u30ea\u30fc\u30cb\u30f3\u30b0\u30fb\u30a2\u30af\u30b7\u30e7\u30f3\u3092\u767b\u9332\u3059\u308b\u3068\u3001Cleanable\u304c\u8fd4\u3055\u308c\u307e\u3059\u3002 \u6700\u3082\u52b9\u7387\u7684\u306a\u4f7f\u7528\u6cd5\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u9589\u3058\u3089\u308c\u305f\u308a\u4e0d\u8981\u306b\u306a\u3063\u305f\u3068\u304d\u306b\u3001clean\u30e1\u30bd\u30c3\u30c9\u3092\u660e\u793a\u7684\u306b\u547c\u3073\u51fa\u3059\u3053\u3068\u3067\u3059\u3002 <\/font><\/p>\n
\u30af\u30ea\u30fc\u30cb\u30f3\u30b0\u30fb\u30a2\u30af\u30b7\u30e7\u30f3\u306f\u3001\u3059\u3067\u306b\u660e\u793a\u7684\u306b\u30af\u30ea\u30fc\u30cb\u30f3\u30b0\u3055\u308c\u3066\u3044\u306a\u3044\u9650\u308a\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u30d5\u30a1\u30f3\u30c8\u30e0\u5230\u9054\u53ef\u80fd\u306b\u306a\u3063\u305f\u3068\u304d\u306b\u547c\u3073\u51fa\u3055\u308c\u308bRunnable\u3067\u3059\u3002 <\/font><\/p>\n
\u30af\u30ea\u30fc\u30cb\u30f3\u30b0\u52d5\u4f5c\u306f\u3001\u767b\u9332\u3055\u308c\u3066\u3044\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u53c2\u7167\u3057\u3066\u306f\u306a\u3089\u306a\u3044\u3053\u3068\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002 \u305d\u3046\u3067\u3042\u308c\u3070\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u60f3\u50cf\u3092\u7d76\u3059\u308b\u3082\u306e\u306b\u306a\u3089\u305a\u3001\u30af\u30ea\u30fc\u30cb\u30f3\u30b0\u52d5\u4f5c\u306f\u81ea\u52d5\u7684\u306b\u547c\u3073\u51fa\u3055\u308c\u307e\u305b\u3093\u3002 <\/font><\/p>\n
\u30af\u30ea\u30fc\u30cb\u30f3\u30b0\u30fb\u30a2\u30af\u30b7\u30e7\u30f3\u306e\u5b9f\u884c\u306f\u3001\u30af\u30ea\u30fc\u30ca\u306b\u95a2\u9023\u3059\u308b\u30b9\u30ec\u30c3\u30c9\u306b\u3088\u3063\u3066\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002 <\/font><\/p>\n
\u30af\u30ea\u30fc\u30cb\u30f3\u30b0\u30fb\u30a2\u30af\u30b7\u30e7\u30f3\u306b\u3088\u3063\u3066\u30b9\u30ed\u30fc\u3055\u308c\u305f\u3059\u3079\u3066\u306e\u4f8b\u5916\u306f\u7121\u8996\u3055\u308c\u307e\u3059\u3002 <\/font><\/p>\n
\u30af\u30ea\u30fc\u30ca\u304a\u3088\u3073\u305d\u306e\u4ed6\u306e\u30af\u30ea\u30fc\u30cb\u30f3\u30b0\u30fb\u30a2\u30af\u30b7\u30e7\u30f3\u306f\u3001\u30af\u30ea\u30fc\u30cb\u30f3\u30b0\u30fb\u30a2\u30af\u30b7\u30e7\u30f3\u306e\u4f8b\u5916\u306e\u5f71\u97ff\u3092\u53d7\u3051\u307e\u305b\u3093\u3002 <\/font><\/p>\n
\u30b9\u30ec\u30c3\u30c9\u306f\u3001\u767b\u9332\u3055\u308c\u3066\u3044\u308b\u3059\u3079\u3066\u306e\u30af\u30ea\u30fc\u30cb\u30f3\u30b0\u51e6\u7406\u304c\u5b8c\u4e86\u3057\u3001\u30af\u30ea\u30fc\u30ca\u81ea\u4f53\u304c\u30ac\u30d9\u30fc\u30b8\u30fb\u30b3\u30ec\u30af\u30bf\u306b\u3088\u3063\u3066\u518d\u5229\u7528\u3055\u308c\u308b\u307e\u3067\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002 <\/font><\/p>\n
System.exit\u4e2d\u306e\u30af\u30ea\u30fc\u30ca\u306e\u52d5\u4f5c\u306f\u5b9f\u88c5\u56fa\u6709\u3067\u3059\u3002 \u30af\u30ea\u30fc\u30cb\u30f3\u30b0\u52d5\u4f5c\u306e\u547c\u3073\u51fa\u3057\u306e\u6709\u7121\u306f\u4fdd\u8a3c\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u3002 <\/font><\/p>\n
\u307b\u304b\u3067\u6307\u5b9a\u304c\u306a\u3044\u5834\u5408\u3001null\u5f15\u6570\u3092\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u307e\u305f\u306f\u3053\u306e\u30af\u30e9\u30b9\u306e\u30e1\u30bd\u30c3\u30c9\u3078\u6e21\u3059\u3068\u3001NullPointerException\u304c\u30b9\u30ed\u30fc\u3055\u308c\u307e\u3059\u3002<\/font><\/p>\n
\u30cd\u30b9\u30c8\u3055\u308c\u305f\u30af\u30e9\u30b9\u304c\u4e00\u3064\u3042\u308a\u307e\u3059\u3002<\/p>\n
public static interface Cleaner.Cleanable<\/font><\/strong><\/p>\n
Cleanable\u306f\u3001Cleaner\u306b\u767b\u9332\u3055\u308c\u3066\u3044\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u30af\u30ea\u30fc\u30cb\u30f3\u30b0\u30fb\u30a2\u30af\u30b7\u30e7\u30f3\u3092\u8868\u3057\u307e\u3059\u3002<\/font><\/p>\n
\u30cd\u30b9\u30c8\u3055\u308c\u305f\u30af\u30e9\u30b9\u306b\u30e1\u30bd\u30c3\u30c9\u304c\u4e00\u3064\u3060\u3051\u3042\u308a\u307e\u3059\u3002<\/p>\n
void clean()<\/font><\/strong><\/p>\n
\u30af\u30ea\u30fc\u30cb\u30f3\u30b0\u53ef\u80fd\u306a\u3082\u306e\u306e\u767b\u9332\u3092\u89e3\u9664\u3057\u3001\u30af\u30ea\u30fc\u30cb\u30f3\u30b0\u52d5\u4f5c\u3092\u547c\u3073\u51fa\u3057\u307e\u3059\u3002 \u30af\u30ea\u30fc\u30cb\u30f3\u30b0\u53ef\u80fd\u306a\u30af\u30ea\u30fc\u30cb\u30f3\u30b0\u52d5\u4f5c\u306f\u3001clean\u306e\u547c\u3073\u51fa\u3057\u56de\u6570\u306b\u95a2\u4fc2\u306a\u304f\u3001\u6700\u5927\u30671\u56de\u547c\u3073\u51fa\u3055\u308c\u307e\u3059\u3002<\/font> <\/p>\n
Cleaner \u30af\u30e9\u30b9\u306b\u306f\u30e1\u30bd\u30c3\u30c9\u304c\uff13\u500b\u3042\u308a\u307e\u3059\u3002<\/p>\n
public static Cleaner create()<\/font><\/strong><\/p>\n
\u65b0\u3057\u3044Cleaner\u3092\u8fd4\u3057\u307e\u3059\u3002 <\/font><\/p>\n
\u30af\u30ea\u30fc\u30ca\u306f\u3001\u30d5\u30a1\u30f3\u30c8\u30e0\u5230\u9054\u53ef\u80fd\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u51e6\u7406\u3057\u3001\u30af\u30ea\u30fc\u30cb\u30f3\u30b0\u30fb\u30a2\u30af\u30b7\u30e7\u30f3\u3092\u547c\u3073\u51fa\u3059daemon thread\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002 <\/font><\/p>\n
\u30b9\u30ec\u30c3\u30c9\u306e\u300c\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u30fb\u30af\u30e9\u30b9\u30fb\u30ed\u30fc\u30c0\u30fc\u300d\u306fsystem class loader\u306b\u8a2d\u5b9a\u3055\u308c\u307e\u3059\u3002 <\/font><\/p>\n
\u30b9\u30ec\u30c3\u30c9\u306f\u30d1\u30fc\u30df\u30c3\u30b7\u30e7\u30f3\u3092\u6301\u305f\u305a\u3001SecurityManager is set\u306e\u5834\u5408\u306b\u306e\u307f\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002 <\/font><\/p>\n
\u30d5\u30a1\u30f3\u30c8\u30e0\u306b\u5230\u9054\u3057\u3001\u767b\u9332\u3055\u308c\u305f\u3059\u3079\u3066\u306e\u30af\u30ea\u30fc\u30cb\u30f3\u30b0\u52d5\u4f5c\u304c\u5b8c\u4e86\u3059\u308b\u3068\u3001\u30af\u30ea\u30fc\u30ca\u306f\u7d42\u4e86\u3057\u307e\u3059\u3002<\/font><\/p>\n
\u623b\u308a\u5024:\u65b0\u3057\u3044Cleaner<\/font><\/p>\n
\u4f8b\u5916:SecurityException – \u73fe\u5728\u306e\u30b9\u30ec\u30c3\u30c9\u304c\u30b9\u30ec\u30c3\u30c9\u306e\u4f5c\u6210\u307e\u305f\u306f\u958b\u59cb\u3092\u8a31\u53ef\u3055\u308c\u3066\u3044\u306a\u3044\u5834\u5408<\/font>\u3002<\/p>\n
public static Cleaner create\u200b(ThreadFactory threadFactory)<\/font><\/strong><\/p>\n
ThreadFactory\u304b\u3089Thread\u3092\u4f7f\u7528\u3057\u3066\u65b0\u3057\u3044Cleaner\u3092\u8fd4\u3057\u307e\u3059\u3002 <\/font><\/p>\n
\u30b9\u30ec\u30c3\u30c9\u30fb\u30d5\u30a1\u30af\u30c8\u30ea\u306enewThread\u30e1\u30bd\u30c3\u30c9\u304b\u3089\u306e\u30b9\u30ec\u30c3\u30c9\u306fdaemon thread\u306b\u8a2d\u5b9a\u3055\u308c\u3001\u30d5\u30a1\u30f3\u30c8\u30e0\u5230\u9054\u53ef\u80fd\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u51e6\u7406\u3057\u3001\u30af\u30ea\u30fc\u30f3\u30fb\u30a2\u30af\u30b7\u30e7\u30f3\u3092\u8d77\u52d5\u3057\u307e\u3059\u3002 <\/font><\/p>\n
\u5404\u547c\u3073\u51fa\u3057\u3067\u3001thread factory\u306f\u3001\u30af\u30ea\u30fc\u30cb\u30f3\u30b0\u30fb\u30a2\u30af\u30b7\u30e7\u30f3\u3092\u5b9f\u884c\u3059\u308b\u306e\u306b\u9069\u3057\u305f\u30b9\u30ec\u30c3\u30c9\u3092\u63d0\u4f9b\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002 <\/font><\/p>\n
\u30d5\u30a1\u30f3\u30c8\u30e0\u306b\u5230\u9054\u3057\u3001\u767b\u9332\u3055\u308c\u305f\u3059\u3079\u3066\u306e\u30af\u30ea\u30fc\u30cb\u30f3\u30b0\u52d5\u4f5c\u304c\u5b8c\u4e86\u3059\u308b\u3068\u3001\u30af\u30ea\u30fc\u30ca\u306f\u7d42\u4e86\u3057\u307e\u3059\u3002<\/font><\/p>\n
\u30d1\u30e9\u30e1\u30fc\u30bf:threadFactory – \u65b0\u3057\u3044Thread\u3092\u8fd4\u3057\u3066\u30af\u30ea\u30fc\u30cb\u30f3\u30b0\u30fb\u30a2\u30af\u30b7\u30e7\u30f3\u3092\u51e6\u7406\u3059\u308bThreadFactory<\/font><\/p>\n
\u623b\u308a\u5024:\u65b0\u3057\u3044Cleaner\u4f8b\u5916:IllegalThreadStateException – \u30b9\u30ec\u30c3\u30c9\u30fb\u30d5\u30a1\u30af\u30c8\u30ea\u304b\u3089\u306e\u30b9\u30ec\u30c3\u30c9\u304cnot a new thread\u306e\u5834\u5408\u3002
SecurityException – \u73fe\u5728\u306e\u30b9\u30ec\u30c3\u30c9\u304c\u30b9\u30ec\u30c3\u30c9\u306e\u4f5c\u6210\u307e\u305f\u306f\u958b\u59cb\u3092\u8a31\u53ef\u3055\u308c\u3066\u3044\u306a\u3044\u5834\u5408\u3002<\/font><\/p>\n
public Cleaner.Cleanable register\u200b(Object obj, Runnable action)<\/font><\/strong><\/p>\n
\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u30d5\u30a1\u30f3\u30c8\u30e0\u5230\u9054\u53ef\u80fd\u306b\u306a\u3063\u305f\u3068\u304d\u306b\u5b9f\u884c\u3059\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u30af\u30ea\u30fc\u30cb\u30f3\u30b0\u30fb\u30a2\u30af\u30b7\u30e7\u30f3\u3092\u767b\u9332\u3057\u307e\u3059\u3002 <\/font><\/p>\n
\u30af\u30ea\u30fc\u30cb\u30f3\u30b0\u52d5\u4f5c\u306e\u52d5\u4f5c\u306b\u3064\u3044\u3066\u306f\u3001\u4e0a\u8a18\u306e\u300cAPI\u30ce\u30fc\u30c8\u300d\u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044\u3002 <\/font><\/p>\n
\u30d1\u30e9\u30e1\u30fc\u30bf:obj – \u76e3\u8996\u3059\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8
action – \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u30d5\u30a1\u30f3\u30c8\u30e0\u5230\u9054\u53ef\u80fd\u306b\u306a\u3063\u305f\u3068\u304d\u306b\u547c\u3073\u51fa\u3059Runnable<\/font><\/p>\n
\u623b\u308a\u5024:Cleanable\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9<\/font><\/p>\n
\u3053\u308c\u3067\u4eca\u5ea6\u3053\u305d PhantomReference \u3092\u4f7f\u3046\u70ba\u306e\u5fc5\u8981\u6700\u5c0f\u9650\u306e\u60c5\u5831\u3092\u3056\u3063\u304f\u308a\u3068 API \u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u304b\u3089\u5b66\u3093\u3060\u3002<\/p>\n
\u7c21\u5358\u306b PhantomReference \u3063\u3066\u3051\u3063\u304d\u3087\u304f\u3069\u3046\u306a\u306e\uff1f\u3063\u3066\u306e\u3092\u8003\u3048\u3066\u307f\u308b\u3068<\/p>\n
\u30d5\u30a1\u30f3\u30c8\u30e0\u5230\u9054\u53ef\u80fd\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092 ReferenceQueue \u306b\u5165\u308c\u308b\u3002<\/p>\n
\u6ce8\u610f:) \u30d5\u30a1\u30f3\u30c8\u30e0\u5230\u9054\u53ef\u80fd\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e ReferenceQueue \u3078\u306e\u633f\u5165\u306f\u30ac\u30fc\u30d9\u30b8\u30fb\u30b3\u30ec\u30af\u30c8\u3068\u975e\u540c\u671f\u3067\u884c\u308f\u308c\u307e\u3059\u3002\u3088\u3063\u3066 GC \u304c\u50cd\u3044\u3066\u3059\u3050\u306b\u633f\u5165\u3055\u308c\u308b\u3068\u8003\u3048\u3066\u306f\u3044\u3051\u306a\u3044\u3088\u3046\u3067\u3059\u3002<\/strong><\/p>\n
Reference<T> \u30af\u30e9\u30b9\u306e\u4e09\u3064\u3042\u308b\u30e1\u30bd\u30c3\u30c9 poll()\u3001remove()\u3001remove\u200b(long timeout) \u306e\u4f55\u308c\u304b\u306b\u3088\u3063\u3066 ReferenceQueue \u306b\u5165\u308c\u3089\u308c\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u53d6\u308a\u51fa\u3057\u3066\u30af\u30ea\u30fc\u30f3\u30a2\u30c3\u30d7\u3059\u308b\u3002<\/p>\n
\u3053\u308c\u3068\u306f\u5225\u306b finalize() \u304b Cleaner \u30af\u30e9\u30b9\u3092\u4f7f\u3063\u3066\u30af\u30ea\u30fc\u30f3\u30a2\u30c3\u30d7\u3059\u308b\u65b9\u6cd5\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n
\u30af\u30ea\u30fc\u30f3\u30a2\u30c3\u30d7\u306e\u969b\u306f\u30ea\u30bd\u30fc\u30b9\u306e\u89e3\u653e\u51e6\u7406\u304c\u5fc5\u8981\u3067\u3042\u308c\u3070\u5fc5\u305a\u5b9f\u884c\u3059\u308b\u3088\u3046\u306b\u3057\u3066\u304a\u304f\u306e\u304c\u7121\u96e3\u304b\u3082\u3057\u308c\u306a\u3044\u3002<\/p>\n
\u6b63\u3057\u304f\u7406\u89e3\u3067\u304d\u3066\u3044\u308b\u304b\u306f\u602a\u3057\u3044\u3051\u3069\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u7d44\u3093\u3067\u307f\u308b\u3053\u3068\u306b\u3059\u308b\u3002<\/p>\n
\u3068\u308a\u3042\u3048\u305a\u3001\u524d\u56de\u3001\u524d\u3005\u56de\u306b\u7d44\u3093\u3060 SoftReference \u3068 WeakReference \u306e PhantomReference \u30d0\u30fc\u30b8\u30e7\u30f3\u3068\u3057\u3066\u307f\u3088\u3046\u3002<\/p>\n
\u307e\u305a\u3001JDK 1.8 \u5bfe\u5fdc\u306e\u3082\u306e\u304b\u3089\u7d44\u3093\u3067\u3001\u6700\u65b0\u306e JDK 11 \u3067\u4f7f\u3048\u308b Cleaner \u30af\u30e9\u30b9\u3092\u4f7f\u3063\u305f\u3082\u306e\u306b\u5909\u66f4\u3057\u3066\u307f\u308b\u3002<\/p>\n
\u305d\u3093\u306a\u3053\u3093\u306a\u3067\u6b21\u306e\u3088\u3046\u306a\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u7d44\u3093\u3067\u307f\u307e\u3057\u305f\u3002<\/p>\n
 <\/p>\n
\r\npackage jp.yucchi.phantomexterminationclassic;\r\n\r\nimport java.lang.management.GarbageCollectorMXBean;\r\nimport java.lang.management.ManagementFactory;\r\nimport java.lang.management.MemoryMXBean;\r\nimport java.lang.management.MemoryUsage;\r\nimport java.lang.ref.PhantomReference;\r\nimport java.lang.ref.Reference;\r\nimport java.lang.ref.ReferenceQueue;\r\nimport java.util.ArrayList;\r\nimport java.util.List;\r\n\r\n\/**\r\n *\r\n * @author Yucchi\r\n *\/\r\npublic class PhantomExterminationClassic {\r\n\r\n    private static final ReferenceQueue<MemoryConsumer> REFEREN_CEQUEU = new ReferenceQueue<>();\r\n\r\n    public static void main(String[] args) {\r\n\r\n        System.out.println(System.getProperty(\"os.name\") + \" \"\r\n                + System.getProperty(\"os.version\") + \" \" + System.getProperty(\"os.arch\"));\r\n        System.out.println(\"JDK \" + System.getProperty(\"java.version\") + System.lineSeparator());\r\n\r\n        List<PhantomReference<MemoryConsumer>> list = new ArrayList<>();\r\n\r\n        for (int i = 0; i < 1_000; i++) {\r\n            MemoryConsumer memoryConsumer = new MemoryConsumer();\r\n            PhantomReference<MemoryConsumer> phantomReference = new PhantomReference<>(memoryConsumer, REFEREN_CEQUEU);\r\n            list.add(phantomReference);\r\n            checkStatus();\r\n        }\r\n    }\r\n\r\n    private static void checkStatus() {\r\n\r\n        MemoryMXBean memoryBean = ManagementFactory.getMemoryMXBean();\r\n        MemoryUsage usage = memoryBean.getHeapMemoryUsage();\r\n        long usedMemory = usage.getUsed();\r\n        List<GarbageCollectorMXBean> gcMXBeans = ManagementFactory.getGarbageCollectorMXBeans();\r\n        StringBuilder gcStatus = new StringBuilder();\r\n        gcMXBeans.forEach(e -> {\r\n            gcStatus\r\n                    .append(e.getName())\r\n                    .append(\"   \")\r\n                    .append(\"GC Count: \")\r\n                    .append(e.getCollectionCount())\r\n                    .append(\"   \")\r\n                    .append(\"GCTime = \")\r\n                    .append(e.getCollectionTime())\r\n                    .append(\"     \");\r\n        });\r\n\r\n        System.out.print(\"UsedMemory: \" + usedMemory + \"   \");\r\n        System.out.println(gcStatus);\r\n\r\n\/\/        Reference<?> ref;\r\n\/\/        while ((ref = REFEREN_CEQUEU.poll()) != null) {\r\n\/\/            System.out.println(\"    --- POLL:\" + ref + \" ---\");\r\n\/\/            if (Double.parseDouble(System.getProperty(\"java.specification.version\")) < 1.9) {\r\n\/\/                ref.clear();\r\n\/\/            }\r\n\/\/        }\r\n\r\n    }\r\n\r\n    private static class MemoryConsumer {\r\n\r\n        private byte[] buff;\r\n\r\n        MemoryConsumer() {\r\n            this.buff = new byte[100 * 1024 * 1024];\r\n        }\r\n\r\n        @Override\r\n        protected void finalize() {\r\n            System.out.println(\"    --- finalize ---\");\r\n            this.buff = null;\r\n        }\r\n\r\n    }\r\n\r\n}\r\n\r\n<\/code><\/pre>\n
\u3053\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306f finalize() \u30e1\u30bd\u30c3\u30c9\u3092\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3057\u3066\u5229\u7528\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
finalize() \u30e1\u30bd\u30c3\u30c9\u5185\u3067 this.buff = null; \u3068\u3057\u3066 OutOfMemoryError \u3092\u56de\u907f\u3057\u3066\u3044\u307e\u3059\u3002\uff08\u3053\u306e\u3088\u3046\u306a\u3053\u3068\u306f JDK 11 \u3067\u306f\u5fc5\u8981\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3067\u3057\u305f\u3002\uff09<\/p>\n
Reference<T> \u30af\u30e9\u30b9\u306e poll() \u30e1\u30bd\u30c3\u30c9\u306f\u30b3\u30e1\u30f3\u30c8\u30a2\u30a6\u30c8\u3057\u3066\u5b9f\u884c\u3067\u304d\u306a\u3044\u3088\u3046\u306b\u3057\u3066\u3042\u308a\u307e\u3059\u3002<\/p>\n
\u3061\u306a\u307f\u306b finalize() \u30e1\u30bd\u30c3\u30c9\u3082\u4f7f\u308f\u306a\u3051\u308c\u3070 OutOfMemoryError \u3067\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\u9014\u4e2d\u3067\u6b62\u307e\u3063\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n
\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u5b9f\u884c\u7d50\u679c\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
Windows 10 10.0 amd64
JDK 1.8.0_144<\/font><\/p>\n
UsedMemory: 115595064   PS Scavenge   GC Count: 0   GCTime = 0     PS MarkSweep   GC Count: 0   GCTime = 0     
UsedMemory: 241927592   PS Scavenge   GC Count: 0   GCTime = 0     PS MarkSweep   GC Count: 0   GCTime = 0     
    — finalize —
    — finalize —
UsedMemory: 321118712   PS Scavenge   GC Count: 1   GCTime = 128     PS MarkSweep   GC Count: 0   GCTime = 0     
UsedMemory: 430987664   PS Scavenge   GC Count: 1   GCTime = 128     PS MarkSweep   GC Count: 0   GCTime = 0     
    — finalize —
    — finalize —
UsedMemory: 525473600   PS Scavenge   GC Count: 2   GCTime = 257     PS MarkSweep   GC Count: 0   GCTime = 0
\u7565
UsedMemory: 6299540808   PS Scavenge   GC Count: 26   GCTime = 30760     PS MarkSweep   GC Count: 24   GCTime = 6659     
UsedMemory: 6404398424   PS Scavenge   GC Count: 26   GCTime = 30760     PS MarkSweep   GC Count: 24   GCTime = 6659     
UsedMemory: 6509256040   PS Scavenge   GC Count: 26   GCTime = 30760     PS MarkSweep   GC Count: 24   GCTime = 6659     
UsedMemory: 6614113656   PS Scavenge   GC Count: 26   GCTime = 30760     PS MarkSweep   GC Count: 24   GCTime = 6659<\/font><\/p>\n
57\u79d2\u307b\u3069\u3067\u7d42\u4e86\u3057\u307e\u3057\u305f\u3002<\/p>\n
\u3061\u3087\u3063\u3068\u9045\u3044\u3067\u3059\u306d\u3002<\/p>\n
NetBeans \u306e\u30d7\u30ed\u30d5\u30a1\u30a4\u30e9\u3067\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3059\u3002<\/p>\n
\"11\"<\/a><\/p>\n
 <\/p>\n
\"12\"<\/a><\/p>\n
 <\/p>\n
\"13\"<\/a><\/p>\n
 <\/p>\n
JDK 1.8 \u306e\u6a19\u6e96\u306e\u30ac\u30fc\u30d9\u30b8\u30fb\u30b3\u30ec\u30af\u30bf\u3063\u3066\u3053\u3093\u306a\u3082\u306e\u306a\u306e\u304b\uff1f<\/p>\n
\u305d\u308c\u3067\u306f\u5148\u307b\u3069\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092 Reference<T> \u30af\u30e9\u30b9\u306e poll() \u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3046\u3088\u3046\u306b\u5909\u66f4\u3057\u305f\u5b9f\u884c\u7d50\u679c\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n
Windows 10 10.0 amd64
JDK 1.8.0_144<\/font><\/p>\n
UsedMemory: 115595064   PS Scavenge   GC Count: 0   GCTime = 0     PS MarkSweep   GC Count: 0   GCTime = 0     
UsedMemory: 241927592   PS Scavenge   GC Count: 0   GCTime = 0     PS MarkSweep   GC Count: 0   GCTime = 0     
UsedMemory: 315733616   PS Scavenge   GC Count: 1   GCTime = 129     PS MarkSweep   GC Count: 0   GCTime = 0     
    — POLL:java.lang.ref.PhantomReference@548c4f57 —
    — POLL:java.lang.ref.PhantomReference@1218025c —
UsedMemory: 425602568   PS Scavenge   GC Count: 1   GCTime = 129     PS MarkSweep   GC Count: 0   GCTime = 0     
UsedMemory: 525440640   PS Scavenge   GC Count: 2   GCTime = 260     PS MarkSweep   GC Count: 0   GCTime = 0     
    — POLL:java.lang.ref.PhantomReference@816f27d —
    — POLL:java.lang.ref.PhantomReference@87aac27 —
UsedMemory: 640519896   PS Scavenge   GC Count: 2   GCTime = 260     PS MarkSweep   GC Count: 0   GCTime = 0     
UsedMemory: 745377512   PS Scavenge   GC Count: 2   GCTime = 260     PS MarkSweep   GC Count: 0   GCTime = 0     
UsedMemory: 850235128   PS Scavenge   GC Count: 2   GCTime = 260     PS MarkSweep   GC Count: 0   GCTime = 0     
UsedMemory: 955092744   PS Scavenge   GC Count: 2   GCTime = 260     PS MarkSweep   GC Count: 0   GCTime = 0     
UsedMemory: 629860128   PS Scavenge   GC Count: 3   GCTime = 569     PS MarkSweep   GC Count: 1   GCTime = 43     
    — POLL:java.lang.ref.PhantomReference@3e3abc88 —
\u7565
    — POLL:java.lang.ref.PhantomReference@cb644e —
UsedMemory: 5880074344   PS Scavenge   GC Count: 26   GCTime = 30258     PS MarkSweep   GC Count: 24   GCTime = 6566     
UsedMemory: 5984931960   PS Scavenge   GC Count: 26   GCTime = 30258     PS MarkSweep   GC Count: 24   GCTime = 6566     
UsedMemory: 6089789576   PS Scavenge   GC Count: 26   GCTime = 30258     PS MarkSweep   GC Count: 24   GCTime = 6566     
UsedMemory: 6194647192   PS Scavenge   GC Count: 26   GCTime = 30258     PS MarkSweep   GC Count: 24   GCTime = 6566     
UsedMemory: 6299504808   PS Scavenge   GC Count: 26   GCTime = 30258     PS MarkSweep   GC Count: 24   GCTime = 6566     
UsedMemory: 6404362424   PS Scavenge   GC Count: 26   GCTime = 30258     PS MarkSweep   GC Count: 24   GCTime = 6566     
UsedMemory: 6509220040   PS Scavenge   GC Count: 26   GCTime = 30258     PS MarkSweep   GC Count: 24   GCTime = 6566     
UsedMemory: 6614077656   PS Scavenge   GC Count: 26   GCTime = 30258     PS MarkSweep   GC Count: 24   GCTime = 6566     
UsedMemory: 6718935272   PS Scavenge   GC Count: 26   GCTime = 30258     PS MarkSweep   GC Count: 24   GCTime = 6566     
UsedMemory: 6823792888   PS Scavenge   GC Count: 26   GCTime = 30258     PS MarkSweep   GC Count: 24   GCTime = 6566<\/font><\/p>\n
56\u79d2\u3067\u7d42\u4e86\u3057\u307e\u3057\u305f\u3002<\/p>\n
finalize() \u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u305f\u306e\u3068\u307b\u307c\u540c\u3058\u3067\u3059\u306d\u3002<\/p>\n
\u3061\u306a\u307f\u306b64\u884c\u76ee\u306e ref.clear() \u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u884c\u3057\u3066\u53c2\u7167\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u30af\u30ea\u30a2\u3057\u306a\u3044\u3068 OutOfMemoryError \u3067\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\u9014\u4e2d\u3067\u6b62\u307e\u3063\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n
JDK 11 \u3067\u306f clear() \u30e1\u30bd\u30c3\u30c9\u3067\u53c2\u7167\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u30af\u30ea\u30a2\u3057\u306a\u304f\u3066\u3082OutOfMemoryError \u3067\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u6b62\u307e\u308b\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n
\u3044\u3061\u304a\u3046 NetBeans \u306e\u30d7\u30ed\u30d5\u30a1\u30a4\u30e9\u3067\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n
\"14\"<\/a><\/p>\n
 <\/p>\n
\"15\"<\/a><\/p>\n
 <\/p>\n
\"16\"<\/a><\/p>\n
 <\/p>\n
\u5927\u304d\u306a\u9055\u3044\u306f\u306a\u3055\u305d\u3046\u3067\u3059\u3002<\/p>\n
\u305d\u308c\u3067\u306f JDK 11 \u306b\u5207\u308a\u66ff\u3048\u3066 finalize() \u30e1\u30bd\u30c3\u30c9 \u3092\u5229\u7528\u3057\u305f\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5b9f\u884c\u3057\u3066\u307f\u307e\u3059\u3002<\/p>\n
JDK 1.8 \u3068\u306e\u6bd4\u8f03\u306e\u305f\u3081\u306b\u3042\u3048\u3066 finalize() \u30e1\u30bd\u30c3\u30c9 \u3092\u4f7f\u3063\u3066\u307e\u3059\u3002\u3042\u3068\u3067 Cleaner \u30af\u30e9\u30b9\u3092\u4f7f\u3063\u305f\u3082\u306e\u3082\u8a66\u3057\u3066\u307f\u307e\u3059\u3002<\/p>\n
\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u5b9f\u884c\u7d50\u679c\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n
Windows 10 10.0 amd64
JDK 11.0.1<\/font><\/p>\n
UsedMemory: 113246208   G1 Young Generation   GC Count: 0   GCTime = 0     G1 Old Generation   GC Count: 0   GCTime = 0     
UsedMemory: 222298112   G1 Young Generation   GC Count: 0   GCTime = 0     G1 Old Generation   GC Count: 0   GCTime = 0     
UsedMemory: 331350016   G1 Young Generation   GC Count: 0   GCTime = 0     G1 Old Generation   GC Count: 0   GCTime = 0     
UsedMemory: 440401920   G1 Young Generation   GC Count: 0   GCTime = 0     G1 Old Generation   GC Count: 0   GCTime = 0     
    — finalize —
    — finalize —
    — finalize —
    — finalize —
UsedMemory: 546494784   G1 Young Generation   GC Count: 1   GCTime = 3     G1 Old Generation   GC Count: 0   GCTime = 0     
UsedMemory: 655546688   G1 Young Generation   GC Count: 1   GCTime = 3     G1 Old Generation   GC Count: 0   GCTime = 0     
    — finalize —
    — finalize —
UsedMemory: 328435288   G1 Young Generation   GC Count: 2   GCTime = 7     G1 Old Generation   GC Count: 0   GCTime = 0     
UsedMemory: 437487192   G1 Young Generation   GC Count: 2   GCTime = 7     G1 Old Generation   GC Count: 0   GCTime = 0     
\u7565
<\/font><\/p>\n
    — finalize —
    — finalize —
    — finalize —
UsedMemory: 2073652944   G1 Young Generation   GC Count: 106   GCTime = 244     G1 Old Generation   GC Count: 0   GCTime = 0     
UsedMemory: 2182704848   G1 Young Generation   GC Count: 106   GCTime = 244     G1 Old Generation   GC Count: 0   GCTime = 0     
UsedMemory: 2291756752   G1 Young Generation   GC Count: 106   GCTime = 244     G1 Old Generation   GC Count: 0   GCTime = 0<\/font> <\/p>\n
15\u79d2\u3067\u7d42\u4e86\u3057\u307e\u3057\u305f\u3002<\/p>\n
JDK 11 \u306e\u30ac\u30fc\u30d9\u30b8\u30fb\u30b3\u30ec\u30af\u30bf\u512a\u79c0\u3067\u3059\u306d\u3002<\/p>\n
\u78ba\u304b JDK 9 \u304b\u3089 G1GC \u304c\u6a19\u6e96\u306b\u306a\u3063\u305f\u306f\u305a\u3002<\/p>\n
\u3053\u308c\u3082 NetBeans \u306e\u30d7\u30ed\u30d5\u30a1\u30a4\u30e9\u3067\u8997\u3044\u3066\u307f\u307e\u3059\u3002<\/p>\n
\"17\"<\/a><\/p>\n
 <\/p>\n
\"18\"<\/a><\/p>\n
 <\/p>\n
\"19\"<\/a><\/p>\n
 <\/p>\n
\u3053\u306e\u9055\u3044\u3092\u76ee\u306e\u5f53\u305f\u308a\u306b\u3059\u308b\u3068 JDK 1.8 \u306f\u3082\u3046\u4f7f\u3048\u306a\u3044\u3002(^_^;)<\/p>\n
\u3067\u306f\u3001Reference<T> \u30af\u30e9\u30b9\u306e poll() \u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3046\u3088\u3046\u306b\u5909\u66f4\u3057\u3066\u5b9f\u884c\u3057\u3066\u307f\u307e\u3059\u3002<\/p>\n
\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u5b9f\u884c\u7d50\u679c\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
Windows 10 10.0 amd64
JDK 11.0.1<\/font><\/p>\n
UsedMemory: 113246208   G1 Young Generation   GC Count: 0   GCTime = 0     G1 Old Generation   GC Count: 0   GCTime = 0     
UsedMemory: 222298112   G1 Young Generation   GC Count: 0   GCTime = 0     G1 Old Generation   GC Count: 0   GCTime = 0     
UsedMemory: 331350016   G1 Young Generation   GC Count: 0   GCTime = 0     G1 Old Generation   GC Count: 0   GCTime = 0     
UsedMemory: 440401920   G1 Young Generation   GC Count: 0   GCTime = 0     G1 Old Generation   GC Count: 0   GCTime = 0     
UsedMemory: 110281288   G1 Young Generation   GC Count: 1   GCTime = 3     G1 Old Generation   GC Count: 0   GCTime = 0     
    — POLL:java.lang.ref.PhantomReference@d8355a8 —
    — POLL:java.lang.ref.PhantomReference@5e5792a0 —
    — POLL:java.lang.ref.PhantomReference@26653222 —
    — POLL:java.lang.ref.PhantomReference@3532ec19 —
UsedMemory: 219333192   G1 Young Generation   GC Count: 1   GCTime = 3     G1 Old Generation   GC Count: 0   GCTime = 0     
UsedMemory: 328385096   G1 Young Generation   GC Count: 1   GCTime = 3     G1 Old Generation   GC Count: 0   GCTime = 0     
UsedMemory: 437437000   G1 Young Generation   GC Count: 1   GCTime = 3     G1 Old Generation   GC Count: 0   GCTime = 0     
UsedMemory: 110345216   G1 Young Generation   GC Count: 2   GCTime = 7     G1 Old Generation   GC Count: 0   GCTime = 0     
    — POLL:java.lang.ref.PhantomReference@68c4039c —
\u7565
    — POLL:java.lang.ref.PhantomReference@5db250b4 —
    — POLL:java.lang.ref.PhantomReference@223f3642 —
UsedMemory: 219733600   G1 Young Generation   GC Count: 99   GCTime = 208     G1 Old Generation   GC Count: 0   GCTime = 0<\/font><\/p>\n
\u3053\u308c\u308215\u79d2\u3067\u7d42\u4e86\u3057\u307e\u3057\u305f\u3002<\/p>\n
NetBeans \u306e\u30d7\u30ed\u30d5\u30a1\u30a4\u30e9\u3067\u8997\u3044\u3066\u307f\u307e\u3059\u3002<\/p>\n
\"20\"<\/a><\/p>\n
 <\/p>\n
\"21\"<\/a><\/p>\n
 <\/p>\n
\"22\"<\/a><\/p>\n
 <\/p>\n
\u3053\u3061\u3089\u306e\u307b\u3046\u304c\u50c5\u304b\u3060\u3051\u3069\u826f\u3044\u304b\u3082\u3057\u308c\u306a\u3044\u3002<\/p>\n
JDK 1.8 \u3068 JDK 11 \u306e\u9055\u3044\u306f\u30ac\u30fc\u30d9\u30b8\u30fb\u30b3\u30ec\u30af\u30bf\u304c\u5909\u66f4\u3055\u308c\u305f\u304f\u3089\u3044\u3060\u3068\u601d\u3046\u306e\u3067\u3059\u3051\u3069\u4ed6\u306b\u3082\u4f55\u304b\u5909\u66f4\u304c\u3042\u308b\u306e\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n
\u3061\u3087\u3063\u3068\u6c17\u306b\u306a\u308b\u306e\u3067 JDK 1.8 \u3068 JDK 11 \u306e\u30b9\u30ec\u30c3\u30c9\u3092\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3059\u3002<\/p>\n
\u4e21\u65b9\u3068\u3082 Reference<T> \u30af\u30e9\u30b9\u306e poll() \u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u305f\u5834\u5408\u3067\u3059\u3002<\/p>\n
\u307e\u305a\u3001JDK 1.8 \u304b\u3089<\/p>\n
\"23\"<\/a><\/p>\n
\u6b21\u306f JDK 11\u3067\u3059\u3002<\/p>\n
\"24\"<\/a><\/p>\n
JDK 11 \u306e\u307b\u3046\u306b Common-Cleaner \u3068\u3044\u3046\u898b\u6163\u308c\u306a\u3044\u30b9\u30ec\u30c3\u30c9\u304c\u3042\u308a\u307e\u3059\u306d\u3002<\/p>\n
\u3053\u308c\u304c\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u30a2\u30c3\u30d7\u306e\u8981\u56e0\u306e\u4e00\u3064\u306a\u306e\u304b\u306a\u3002<\/p>\n
GC \u95a2\u9023\u306e\u3053\u3068\u306f\u3042\u307e\u308a\u6c17\u306b\u3057\u305f\u3053\u3068\u306a\u3044\u306e\u3067\u3088\u304f\u89e3\u308a\u307e\u305b\u3093\u3002(>_<\uff61)<\/p>\n
\u540d\u524d\u304b\u3089\u3057\u3066\u52dd\u624b\u306b\u30af\u30ea\u30fc\u30f3\u30a2\u30c3\u30d7\u3057\u3066\u304f\u308c\u305d\u3046\u306a\u306e\u3067 finalize() \u30e1\u30bd\u30c3\u30c9\u3001Reference<T> \u30af\u30e9\u30b9\u306e poll() \u30e1\u30bd\u30c3\u30c9\u4e21\u65b9\u3068\u3082\u30b3\u30e1\u30f3\u30c8\u30a2\u30a6\u30c8\u3057\u3066\u7121\u52b9\u306b\u3057\u3066\u5b9f\u884c\u3057\u3066\u307f\u307e\u3057\u305f\u3002<\/p>\n
OutOfMemoryError \u3067\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u6b62\u307e\u308a\u307e\u3057\u30fb\u30fb\u30fb\u3000\u3000\u3042\u308c\u3063\uff01\u3000\u6b62\u307e\u3089\u306a\u3044\u3002<\/p>\n
\u30d7\u30ed\u30b0\u30e9\u30e0\u306f15\u79d2\u3067\u7d42\u4e86\u3057\u307e\u3057\u305f\u3002<\/p>\n
Windows 10 10.0 amd64
JDK 11.0.1<\/font><\/p>\n
UsedMemory: 113246208   G1 Young Generation   GC Count: 0   GCTime = 0     G1 Old Generation   GC Count: 0   GCTime = 0     
UsedMemory: 222298112   G1 Young Generation   GC Count: 0   GCTime = 0     G1 Old Generation   GC Count: 0   GCTime = 0     
UsedMemory: 331350016   G1 Young Generation   GC Count: 0   GCTime = 0     G1 Old Generation   GC Count: 0   GCTime = 0     
UsedMemory: 440401920   G1 Young Generation   GC Count: 0   GCTime = 0     G1 Old Generation   GC Count: 0   GCTime = 0     
UsedMemory: 110281920   G1 Young Generation   GC Count: 1   GCTime = 3     G1 Old Generation   GC Count: 0   GCTime = 0     
UsedMemory: 219333824   G1 Young Generation   GC Count: 1   GCTime = 3     G1 Old Generation   GC Count: 0   GCTime = 0     
UsedMemory: 328385728   G1 Young Generation   GC Count: 1   GCTime = 3     G1 Old Generation   GC Count: 0   GCTime = 0     
UsedMemory: 437437632   G1 Young Generation   GC Count: 1   GCTime = 3     G1 Old Generation   GC Count: 0   GCTime = 0     
UsedMemory: 110325528   G1 Young Generation   GC Count: 2   GCTime = 6     G1 Old Generation   GC Count: 0   GCTime = 0     
\u7565
<\/font><\/p>\n
UsedMemory: 1092084152   G1 Young Generation   GC Count: 98   GCTime = 200     G1 Old Generation   GC Count: 0   GCTime = 0     
UsedMemory: 1201136056   G1 Young Generation   GC Count: 98   GCTime = 200     G1 Old Generation   GC Count: 0   GCTime = 0     
UsedMemory: 110617168   G1 Young Generation   GC Count: 99   GCTime = 202     G1 Old Generation   GC Count: 0   GCTime = 0     
UsedMemory: 219669072   G1 Young Generation   GC Count: 99   GCTime = 202     G1 Old Generation   GC Count: 0   GCTime = 0     
BUILD SUCCESSFUL (total time: 15 seconds)<\/font><\/p>\n
\u3044\u3063\u305f\u3044\u3069\u3046\u3044\u3046\u3053\u3068\u306a\u3093\u3060\uff1f<\/p>\n
\u30af\u30ea\u30fc\u30f3\u30a2\u30c3\u30d7\u306e\u969b\u306b\u30ea\u30bd\u30fc\u30b9\u306e\u89e3\u653e\u51e6\u7406\u304c\u5fc5\u8981\u3067\u7121\u3044\u306e\u306a\u3089\u4f55\u3082\u3057\u306a\u304f\u3066\u3082\u3044\u3044\u306e\u304b\uff1f<\/p>\n
JDK 1.8 \u3067 Reference<T> \u30af\u30e9\u30b9\u306e poll() \u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3046\u5834\u5408\u306f clear() \u30e1\u30bd\u30c3\u30c9\u3067\u53c2\u7167\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u30af\u30ea\u30a2\u3057\u3066\u6b21\u306e GC \u3067\u89e3\u653e\u3055\u308c\u308b\u3068\u3044\u3046\u6700\u4f4e\u3067\u3082 GC \u304c\u4e8c\u56de\u5fc5\u8981\u3060\u3063\u305f\u306e\u306b\u30fb\u30fb\u30fb<\/p>\n
\u30ac\u30fc\u30d9\u30b8\u30fb\u30b3\u30ec\u30af\u30bf\u51c4\u304f\u8ce2\u304f\u306a\u3063\u3066\u3044\u308b\u3002\uff08\u79c1\u304c PhantomReference \u306e\u4f7f\u3044\u65b9\u3092\u9593\u9055\u3063\u3066\u308b\u304b\u3082\u3057\u308c\u306a\u3044\uff09<\/p>\n
\u3053\u306e\u3042\u305f\u308a\u306e\u3053\u3068\u3092\u8abf\u3079\u51fa\u3059\u3068\u30ac\u30fc\u30d9\u30b8\u30fb\u30b3\u30ec\u30af\u30bf\u6cbc\u306b\u306f\u307e\u3063\u3066\u82e6\u3057\u3080\u3053\u3068\u306b\u306a\u308b\u306e\u3067\u8ab0\u304b\u89aa\u5207\u306a\u4eba\u304c\u8a73\u3057\u304f\u89e3\u308a\u3084\u3059\u3044\u89e3\u8aac\u8a18\u4e8b\u3092\u30cd\u30c3\u30c8\u4e0a\u306b\u30a2\u30c3\u30d7\u3057\u3066\u304f\u308c\u308b\u306e\u3092\u5f85\u3064\u3053\u3068\u306b\u3059\u308b\u3002<\/p>\n
\u305d\u308c\u3067\u306f\u6700\u5f8c\u306b Cleaner \u30af\u30e9\u30b9 \u3092\u4f7f\u3063\u3066\u307f\u307e\u3059\u3002<\/p>\n
\u3053\u306e Cleaner \u30af\u30e9\u30b9\u3082\u30d5\u30a1\u30a4\u30ca\u30e9\u30a4\u30b6\u540c\u69d8\u306b\u3042\u307e\u308a\u4f7f\u3046\u306e\u3092\u597d\u307e\u3057\u304f\u601d\u308f\u308c\u3066\u3044\u307e\u305b\u3093\u3002<\/p>\n
\u8a73\u7d30\u306f\u300cEffective Java \u7b2c\uff13\u7248\u300d\u306e\u7b2c\uff12\u7ae0\u3000\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u751f\u6210\u3068\u6d88\u6ec5\u3000\u9805\u76ee 8 \u30d5\u30a1\u30a4\u30ca\u30e9\u30a4\u30b6\u3068\u30af\u30ea\u30fc\u30ca\u30fc\u3092\u907f\u3051\u308b<\/strong>\u3000\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n
 <\/p>\n