僕ã¯Javaã®WeakHashMapを勘é•ã„ã—ã¦ã„ãŸã¨ã„ã†ãƒ¡ãƒ¢ - åƒã‹ãªã„プãƒã‚°ãƒ©ãƒžã®ãƒ¡ãƒ¢å¸³Javaã«WeakHashMapã¨ã„ã†ã‚¯ãƒ©ã‚¹ãŒã‚ã£ã¦ã€åƒ•ã¯ã“れをvalueã‚’å¼±å‚ç…§ã§æŒã¦ã‚‹HashMapã ã¨æ€ã£ã¦ãŸã‚“ã§ã™ã‘ã©ã€æœ¬å½“ã¯keyã‚’å¼±å‚ç…§ã§æŒã¤HashMapã ã£ãŸã®ã§ãƒ¡ãƒ¢ã—ã¦ãŠãã¾ã™ã€‚ ã©ã†ã„ã†ã“ã¨ã‹ã£ã¦è¨€ã†ã¨ã€åƒ•ã¯ã“ã‚“ãªã“ã¨ã‚’期待ã—ã¦ã„ãŸã‚ã‘ã§ã™ã€‚ Map<String, String> m = new WeakHashMap<String, String>(); String key = new String("hoge"); String value = new String("fuga"); m.put(key, value); System.out.println(m.containsKey("hoge")); // => true value = null; System.out.println(m.containsKey("hoge")); // => false
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