{"id":4098,"date":"2019-04-09T13:41:39","date_gmt":"2019-04-09T05:41:39","guid":{"rendered":"http:\/\/www.xttblog.com\/?p=4098"},"modified":"2019-04-09T13:41:39","modified_gmt":"2019-04-09T05:41:39","slug":"%e6%b7%b1%e5%85%a5%e6%b5%85%e5%87%balinkedhashmap%e5%8e%9f%e7%90%86%e5%92%8c%e6%ba%90%e7%a0%81%e8%a7%a3%e8%af%bb","status":"publish","type":"post","link":"https:\/\/www.xttblog.com\/?p=4098","title":{"rendered":"\u6df1\u5165\u6d45\u51faLinkedHashMap\u539f\u7406\u548c\u6e90\u7801\u89e3\u8bfb"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u6700\u8fd1\uff0c\u6211\u77e5\u9053\u6709\u597d\u51e0\u4e2a\u540c\u5b66\u4f1a\u5076\u5c14\u7684\u9605\u8bfb\u9605\u8bfb\u6211\u7684\u535a\u5ba2\u3002\u6211\u500d\u611f\u538b\u529b\uff0c\u4ed6\u90fd\u662f CTO \u7ea7\u7684\u4eba\u7269\uff0c\u6211\u7ecf\u5e38\u5411\u4ed6\u4eec\u53d6\u7ecf\uff0c\u819c\u62dc\u4ed6\u4eec\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e0d\u6700\u8fd1\uff0c\u6709\u4e00\u4e2a\u540c\u5b66\u516c\u53f8\u91cc\u8981\u641e\u57f9\u8bad\uff0c\u4e3b\u8bb2\u4eba\u5bf9 LinkedHashMap \u8bb2\u7684\u4e0d\u591f\u6df1\uff0c\u5e0c\u671b\u6211\u6709\u597d\u6587\u7ae0\u63a8\u8350\u4e00\u4e0b\u3002\u65e2\u7136\u8fd9\u4e48\u8bf4\u4e86\uff0c\u90a3\u6211\u4f55\u4e0d\u89e3\u51b3\u5ba3\u4f20\u4e00\u4e0b\u81ea\u5df1\u7684\u516c\u4f17\u53f7\u5462\uff1f<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=https:\/\/wx1.sinaimg.cn\/large\/8fa5dcfcgy1g1wbf2t55vj20mo0jmgo2.jpg\" alt=\"\" \/><figcaption>996icu\u7684\u7a0b\u5e8f\u5458<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">LinkedHashMap \u987e\u540d\u601d\u4e49\uff0c\u5c31\u662f\u4e00\u4e2a\u57fa\u4e8e HashMap \u7684\u53cc\u5411\u94fe\u8868\u7684\u96c6\u5408\u3002\u5176\u4e2d HashMap \u4e3a\u6570\u7ec4\u52a0\u5355\u5411\u94fe\u8868\u7684\u7ed3\u6784\uff0cLinkedList \u4e3a\u53cc\u5411\u94fe\u8868\u5b9e\u73b0\u7684\u3002\u800c LinkedHashMap \u6b63\u662f\u4e8c\u8005\u7684\u7ed3\u5408\u4f53\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=https:\/\/wx1.sinaimg.cn\/large\/8fa5dcfcgy1g1wbg8u5zsj209c02iglv.jpg\" alt=\"\" \/><figcaption>LinkedHashMap \u6e90\u7801<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u9996\u5148\uff0c\u4ece\u6e90\u7801\u4e0a\u6765\u770b\uff0cLinkedHashMap \u7ee7\u627f\u81ea HashMap\uff0c\u6240\u4ee5 HashMap \u6709\u7684\u5927\u90e8\u5206\u7279\u6027\uff0cLinkedHashMap \u90fd\u6709\u3002\u6bd4\u5982\uff1a\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898\u7b49\u3002\u5173\u4e8e HashMap \u63a8\u8350\u9605\u8bfb\u300a<a href=\"https:\/\/www.xttblog.com\/?p=3375\">\u641e\u4e0d\u61c2 HashMap\uff1f\u53ea\u56e0\u4f60\u7f3a\u4e00\u4e2a HashMap \u7684\u539f\u7406\u673a\u5236\u6d41\u7a0b\u56fe\uff01<\/a>\u300b\u3002 <\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=https:\/\/wx1.sinaimg.cn\/large\/8fa5dcfcgy1g1wbhcn418j20s70hlwgn.jpg\" alt=\"\" \/><figcaption>LinkedHashMap \u7c7b\u56fe<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u987a\u7740 LinkedHashMap \u7684\u6e90\u7801\u5f80\u4e0b\u770b\uff0c\u4f60\u4f1a\u53d1\u73b0 LinkedHashMap \u63d0\u4f9b\u4e86 5 \u4e2a\u6784\u9020\u51fd\u6570\u3002\u57fa\u672c\u4e0a\u5c31\u662f\u5bf9 HashMap \u7684\u6784\u9020\u51fd\u6570\u505a\u4e86\u6269\u5c55\uff0c\u52a0\u4e86\u4e00\u4e2a\u91cd\u8981\u7684\u53c2\u6570 accessOrder\uff0c\u5b83\u4ee3\u8868\u7684\u662f\u4e00\u4e2a\u8bbf\u95ee\u987a\u5e8f\uff0c\u540e\u9762\u4f1a\u5177\u4f53\u7684\u8bb2\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=https:\/\/wx1.sinaimg.cn\/large\/8fa5dcfcgy1g1wbiccuf1j20lc0ejdia.jpg\" alt=\"\" \/><figcaption>LinkedHashMap \u6e90\u7801\u4e2d\u91cd\u8981\u7684\u65b9\u6cd5\u5217\u8868<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u6ce8\u610f\u4e0a\u56fe\uff0cLinkedHashMap \u8fd8\u6709\u4e00\u4e2a\u6539\u53d8\u5c31\u662f\u591a\u4e86\u4e24\u4e2a\u5c5e\u6027\uff1aheader \u548c accessOrder\u3002header \u5c31\u662f\u53cc\u5411\u94fe\u8868\u7684\u8868\u5934\u5143\u7d20\u3002\u5f53 accessOrder \u4e3a true \u65f6\uff0c\u4ee3\u8868\u6309\u8bbf\u95ee\u987a\u5e8f\u8fed\u4ee3\uff0cfalse \u65f6\u8868\u793a\u6309\u7167\u63d2\u5165\u987a\u5e8f\u3002\u8fd9\u4e2a\u914d\u56fe\u6765\u81ea\u7f51\u4e0a\uff0c\u662f\u57fa\u4e8e JDK1.6 \u7684\uff0c\u73b0\u5728 JDK8 \u7684\u53d8\u5316\u5df2\u7ecf\u5f88\u5927\u4e86\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">LinkedHashMap \u7ee7\u627f\u4e86 HashMap \u4e2d\u5927\u90e8\u5206\u7684\u65b9\u6cd5\uff0c\u53ea\u662f\u591a\u4e86\u53cc\u5411\u94fe\u8868\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=https:\/\/wx1.sinaimg.cn\/large\/8fa5dcfcgy1g1wbjkqjrtj20if08lmyj.jpg\" alt=\"\" \/><figcaption>LinkedHashMap \u6570\u7ec4 + \u94fe\u8868\u7ed3\u6784<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">LinkedHashMap \u7684 Entry \u589e\u52a0\u4e86\u7528\u4e8e\u7ef4\u62a4\u987a\u5e8f\u7684 before \u548c after \u53d8\u91cf\uff0c\u5c31\u662f\u7528\u6765\u786e\u5b9a\u94fe\u8868\u7684\u524d\u540e\u8282\u70b9\u3002\u672c\u6765\u65e0\u5e8f\u7684\u6570\u7ec4 + \u94fe\u8868\u7ed3\u6784\uff0c\u901a\u8fc7 before \u548c after \u628a\u5b83\u4eec\u5173\u8054\u8d77\u6765\uff0c\u53d8\u7684\u6709\u5e8f\u3002\u5728 put \u548c get \u7684\u65f6\u5019\u7ef4\u62a4\u597d\u4e86\u8fd9\u4e2a\u53cc\u5411\u94fe\u8868\uff0c\u904d\u5386\u7684\u65f6\u5019\u5c31\u6709\u5e8f\u4e86\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">LinkedHashMap \u7684\u8282\u70b9 Entry \u7ee7\u627f\u81ea HashMap.Node\uff0c\u7136\u540e\u5c06\u5355\u5411\u94fe\u8868\u6539\u6210\u4e86\u4e00\u4e2a\u53cc\u5411\u94fe\u8868\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=https:\/\/wx1.sinaimg.cn\/large\/8fa5dcfcgy1g1wbl5lzr5j20g704ygmf.jpg\" alt=\"\" \/><figcaption>LinkedHashMap \u7684\u8282\u70b9 Entry<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">LinkedHashMap \u5e76\u6ca1\u6709\u91cd\u5199\u4efb\u4f55 put \u65b9\u6cd5\u3002\u4f46\u662f\u5176\u91cd\u5199\u4e86\u6784\u5efa\u65b0\u8282\u70b9\u7684 newNode() \u65b9\u6cd5\u3002<br>\nnewNode() \u4f1a\u5728 HashMap \u7684 putVal() \u65b9\u6cd5\u91cc\u88ab\u8c03\u7528\uff0cputVal() \u65b9\u6cd5\u4f1a\u5728\u6279\u91cf\u63d2\u5165\u6570\u636e putMapEntries(Map m, boolean evict) \u6216\u8005\u63d2\u5165\u5355\u4e2a\u6570\u636e public V put(K key, V value) \u65f6\u88ab\u8c03\u7528\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">LinkedHashMap \u91cd\u5199\u4e86 newNode(),\u5728\u6bcf\u6b21\u6784\u5efa\u65b0\u8282\u70b9\u65f6\uff0c\u901a\u8fc7 linkNodeLast(p); \u5c06\u65b0\u8282\u70b9\u94fe\u63a5\u5728\u5185\u90e8\u53cc\u5411\u94fe\u8868\u7684\u5c3e\u90e8\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=https:\/\/wx1.sinaimg.cn\/large\/8fa5dcfcgy1g1wbnxlqyrj20gp03pjs1.jpg\" alt=\"\" \/><figcaption>LinkedHashMap \u6e90\u7801 newNode<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u5176\u4e2d\u7684 linkNodeLast \u65b9\u6cd5\uff0c\u4f1a\u5c06\u65b0\u589e\u7684\u8282\u70b9\u3002\u5982\u679c\uff0c\u96c6\u5408\u4e4b\u524d\u662f\u7a7a\u7684\uff0c\u6307\u5b9a head \u8282\u70b9\uff1b\u5426\u5219\u5c06\u65b0\u8282\u70b9\u8fde\u63a5\u5728\u94fe\u8868\u7684\u5c3e\u90e8\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u53e6\u5916 LinkedHashMap \u7684 afterNodeInsertion \u65b9\u6cd5\u4e5f\u975e\u5e38\u7684\u91cd\u8981\uff0c\u5b83\u4f1a\u5728\u65b0\u8282\u70b9\u63d2\u5165\u4e4b\u540e\u56de\u8c03\uff0c\u6839\u636e evict \u548c first \u5224\u65ad\u662f\u5426\u9700\u8981\u5220\u9664\u6700\u8001\u63d2\u5165\u7684\u8282\u70b9\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=https:\/\/wx1.sinaimg.cn\/large\/8fa5dcfcgy1g1wbp9icqfj20lp045759.jpg\" alt=\"\" \/><figcaption>LinkedHashMap \u7684 afterNodeInsertion \u65b9\u6cd5<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">LinkedHashMap \u8fd8\u91cd\u5199\u4e86 afterNodeRemoval \u8fd9\u4e2a\u65b9\u6cd5\u3002\u5728\u5220\u9664\u8282\u70b9 e \u65f6\uff0c\u540c\u6b65\u5c06 e \u4ece\u53cc\u5411\u94fe\u8868\u4e0a\u5220\u9664\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=https:\/\/wx1.sinaimg.cn\/large\/8fa5dcfcgy1g1wbq861wnj20lm098abs.jpg\" alt=\"\" \/><figcaption>LinkedHashMap \u91cd\u5199\u4e86 afterNodeRemoval<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u53e6\u5916 get() \u548c getOrDefault() \u65b9\u6cd5\u4e5f\u88ab\u91cd\u5199\u4e86\u3002\u56e0\u4e3a\u6211\u4eec\u8981\u6839\u636e accessOrder \u89c4\u5219\u6765\u8c03\u6574\u5177\u4f53\u7684\u83b7\u53d6\u65b9\u6cd5\u3002\u5728 accessOrder \u4e3a true \u7684\u60c5\u51b5\u4e0b\uff0c\u8981\u53bb\u56de\u8c03 void afterNodeAccess(Node e) \u51fd\u6570\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=https:\/\/wx1.sinaimg.cn\/large\/8fa5dcfcgy1g1wbrfajtvj20fs0aign4.jpg\" alt=\"\" \/><figcaption>afterNodeAccess() \u51fd\u6570<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728 afterNodeAccess() \u51fd\u6570\u4e2d\uff0c\u4f1a\u5c06\u5f53\u524d\u88ab\u8bbf\u95ee\u5230\u7684\u8282\u70b9 e\uff0c\u79fb\u52a8\u81f3\u5185\u90e8\u7684\u53cc\u5411\u94fe\u8868\u7684\u5c3e\u90e8\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=https:\/\/wx1.sinaimg.cn\/large\/8fa5dcfcgy1g1wbsqsmq7j20nq0e10w4.jpg\" alt=\"\" \/><figcaption>afterNodeAccess \u65b9\u6cd5\u57cb\u4e0b\u4e86\u9690\u60a3<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u901a\u8fc7\u4e0a\u56fe\u7684\u89e3\u91ca\uff0c\u4f60\u4f1a\u53d1\u73b0\u3002afterNodeAccess \u65b9\u6cd5\u57cb\u4e0b\u4e86\u9690\u60a3\uff0c\u4f1a\u4fee\u6539 modCount\uff0c\u56e0\u6b64\u5f53\u4f60\u6b63\u5728 accessOrder=true \u7684\u6a21\u5f0f\u4e0b\uff0c\u8fed\u4ee3 LinkedHashMap \u65f6\uff0c\u5982\u679c\u540c\u65f6\u67e5\u8be2\u8bbf\u95ee\u6570\u636e\uff0c\u4e5f\u4f1a\u5bfc\u81f4 fail-fast\uff0c\u56e0\u4e3a\u8fed\u4ee3\u7684\u987a\u5e8f\u5df2\u7ecf\u6539\u53d8\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6700\u540e\uff0c\u603b\u7ed3\u4e00\u4e0b\u3002LinkedHashMap \u76f8\u5bf9\u4e8e HashMap \u7684\u6e90\u7801\u6bd4\uff0c\u662f\u5f88\u7b80\u5355\u7684\u3002\u56e0\u4e3a\u5927\u6811\u5e95\u4e0b\u597d\u4e58\u51c9\u3002\u5b83\u7ee7\u627f\u4e86 HashMap\uff0c\u4ec5\u91cd\u5199\u4e86\u51e0\u4e2a\u65b9\u6cd5\uff0c\u4ee5\u6539\u53d8\u5b83\u8fed\u4ee3\u904d\u5386\u65f6\u7684\u987a\u5e8f\u3002\u8fd9\u4e5f\u662f\u5176\u4e0e HashMap \u76f8\u6bd4\u6700\u5927\u7684\u4e0d\u540c\u3002\u5728\u6bcf\u6b21\u63d2\u5165\u6570\u636e\uff0c\u6216\u8005\u8bbf\u95ee\u3001\u4fee\u6539\u6570\u636e\u65f6\uff0c\u4f1a\u589e\u52a0\u8282\u70b9\u3001\u6216\u8c03\u6574\u94fe\u8868\u7684\u8282\u70b9\u987a\u5e8f\u3002\u4ee5\u51b3\u5b9a\u8fed\u4ee3\u65f6\u8f93\u51fa\u7684\u987a\u5e8f\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>accessOrder\uff0c\u9ed8\u8ba4\u662f false\uff0c\u5219\u8fed\u4ee3\u65f6\u8f93\u51fa\u7684\u987a\u5e8f\u662f\u63d2\u5165\u8282\u70b9\u7684\u987a\u5e8f\u3002\u82e5\u4e3a true\uff0c\u5219\u8f93\u51fa\u7684\u987a\u5e8f\u662f\u6309\u7167\u8bbf\u95ee\u8282\u70b9\u7684\u987a\u5e8f\u3002\u4e3a true \u65f6\uff0c\u53ef\u4ee5\u5728\u8fd9\u57fa\u7840\u4e4b\u4e0a\u6784\u5efa\u4e00\u4e2a LruCache\u3002\u53c2\u8003\u300a<a href=\"https:\/\/www.xttblog.com\/?p=4096\">\u624b\u628a\u624b\u6559\u4f60\u7528LinkedHashMap\u6253\u9020FIFO\u548cLRU\u7f13\u5b58\u7cfb\u7edf<\/a>\u300b\n<\/li><li>LinkedHashMap \u5e76\u6ca1\u6709\u91cd\u5199\u4efb\u4f55 put \u65b9\u6cd5\u3002\u4f46\u662f\u5176\u91cd\u5199\u4e86\u6784\u5efa\u65b0\u8282\u70b9\u7684 newNode() \u65b9\u6cd5.\u5728\u6bcf\u6b21\u6784\u5efa\u65b0\u8282\u70b9\u65f6\uff0c\u5c06\u65b0\u8282\u70b9\u94fe\u63a5\u5728\u5185\u90e8\u53cc\u5411\u94fe\u8868\u7684\u5c3e\u90e8\n<\/li><li>accessOrder=true \u7684\u6a21\u5f0f\u4e0b\uff0c\u5728 afterNodeAccess() \u51fd\u6570\u4e2d\uff0c\u4f1a\u5c06\u5f53\u524d\u88ab\u8bbf\u95ee\u5230\u7684\u8282\u70b9 e\uff0c\u79fb\u52a8\u81f3\u5185\u90e8\u7684\u53cc\u5411\u94fe\u8868\u7684\u5c3e\u90e8\u3002\u503c\u5f97\u6ce8\u610f\u7684\u662f\uff0cafterNodeAccess() \u51fd\u6570\u4e2d\uff0c\u4f1a\u4fee\u6539 modCount\uff0c\u56e0\u6b64\u5f53\u4f60\u6b63\u5728 accessOrder=true \u7684\u6a21\u5f0f\u4e0b\uff0c\u8fed\u4ee3 LinkedHashMap \u65f6\uff0c\u5982\u679c\u540c\u65f6\u67e5\u8be2\u8bbf\u95ee\u6570\u636e\uff0c\u4e5f\u4f1a\u5bfc\u81f4 fail-fast\uff0c\u56e0\u4e3a\u8fed\u4ee3\u7684\u987a\u5e8f\u5df2\u7ecf\u6539\u53d8\u3002\n<\/li><li>nextNode() \u5c31\u662f\u8fed\u4ee3\u5668\u91cc\u7684next()\u65b9\u6cd5\u3002\u8be5\u65b9\u6cd5\u7684\u5b9e\u73b0\u53ef\u4ee5\u770b\u51fa\uff0c\u8fed\u4ee3 LinkedHashMap\uff0c\u5c31\u662f\u4ece\u5185\u90e8\u7ef4\u62a4\u7684\u53cc\u94fe\u8868\u7684\u8868\u5934\u5f00\u59cb\u5faa\u73af\u8f93\u51fa\u3002\u800c\u53cc\u94fe\u8868\u8282\u70b9\u7684\u987a\u5e8f\u5728LinkedHashMap\u7684\u589e\u3001\u5220\u3001\u6539\u3001\u67e5\u65f6\u90fd\u4f1a\u66f4\u65b0\u3002\u4ee5\u6ee1\u8db3\u6309\u7167\u63d2\u5165\u987a\u5e8f\u8f93\u51fa\uff0c\u8fd8\u662f\u8bbf\u95ee\u987a\u5e8f\u8f93\u51fa\u3002\n<\/li><li>\u5b83\u4e0e HashMap \u6bd4\uff0c\u8fd8\u6709\u4e00\u4e2a\u5c0f\u5c0f\u7684\u4f18\u5316\uff0c\u91cd\u5199\u4e86 containsValue() \u65b9\u6cd5\uff0c\u76f4\u63a5\u904d\u5386\u5185\u90e8\u94fe\u8868\u53bb\u6bd4\u5bf9 value \u503c\u662f\u5426\u76f8\u7b49\u3002\n<\/li><\/ul>\n<!-- <audio autoplay=\"autoplay\" height=\"100\" width=\"100\" hidden=\"true\"><source src=\"https:\/\/c.coka.la\/orAvPR.mp3\" type=\"audio\/mp3\"\/><\/audio><img decoding=\"async\" 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