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3.<strong>\u95ee\uff1a\u5982\u4f55\u4f7fHashMap\u53d8\u5f97\u7ebf\u7a0b\u5b89\u5168\uff1f<\/strong><\/p>\n\n\n\n<p>\u7b54\uff1a\u53ef\u4ee5\u4f7f\u7528Collections.synchronizedMap()\u65b9\u6cd5\u6765\u83b7\u53d6\u4e00\u4e2a\u7ebf\u7a0b\u5b89\u5168\u7684HashMap\uff0c\u6216\u8005\u4f7f\u7528ConcurrentHashMap\u3002<\/p>\n\n\n\n<p>    4.<strong>\u95ee\uff1a\u4ec0\u4e48\u662f\u54c8\u5e0c\u51b2\u7a81\uff0c\u5982\u4f55\u89e3\u51b3\uff1f<\/strong><\/p>\n\n\n\n<p>\u7b54\uff1a\u5f53\u4e24\u4e2a\u4e0d\u540c\u7684\u952e\u5177\u6709\u76f8\u540c\u7684\u54c8\u5e0c\u503c\u65f6\uff0c\u79f0\u4e3a\u54c8\u5e0c\u51b2\u7a81\u3002HashMap\u901a\u8fc7\u94fe\u8868\u548c\u7ea2\u9ed1\u6811\u6765\u89e3\u51b3\u54c8\u5e0c\u51b2\u7a81\u3002<\/p>\n\n\n\n<p>    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