“`” ConcurrentHashMap \u548c Hashtable \u7684\u533a\u522b\u4e3b\u8981\u4f53\u73b0\u5728\u5b9e\u73b0\u7ebf\u7a0b\u5b89\u5168\u7684\u65b9\u5f0f\u4e0a\u4e0d\u540c\u3002<\/p>\n
<ul><li><strong>\u5e95\u5c42\u6570\u636e\u7ed3\u6784\uff1a<\/strong> JDK1.7\u7684 ConcurrentHashMap \u5e95\u5c42\u91c7\u7528 <strong>\u5206\u6bb5\u7684\u6570\u7ec4+\u94fe\u8868<\/strong> \u5b9e\u73b0\uff0cJDK1.8 \u91c7\u7528\u7684\u6570\u636e\u7ed3\u6784\u8ddfHashMap1.8\u7684\u7ed3\u6784\u4e00\u6837\uff0c\u6570\u7ec4+\u94fe\u8868\/\u7ea2\u9ed1\u4e8c\u53c9\u6811\u3002Hashtable \u548c JDK1.8 \u4e4b\u524d\u7684 HashMap \u7684\u5e95\u5c42\u6570\u636e\u7ed3\u6784\u7c7b\u4f3c\u90fd\u662f\u91c7\u7528 <strong>\u6570\u7ec4+\u94fe\u8868<\/strong> \u7684\u5f62\u5f0f\uff0c\u6570\u7ec4\u662f HashMap \u7684\u4e3b\u4f53\uff0c\u94fe\u8868\u5219\u662f\u4e3b\u8981\u4e3a\u4e86\u89e3\u51b3\u54c8\u5e0c\u51b2\u7a81\u800c\u5b58\u5728\u7684\uff1b<\/li><li><strong>\u5b9e\u73b0\u7ebf\u7a0b\u5b89\u5168\u7684\u65b9\u5f0f\uff08\u91cd\u8981\uff09\uff1a<\/strong> \u2460 <strong>\u5728JDK1.7\u7684\u65f6\u5019\uff0cConcurrentHashMap\uff08\u5206\u6bb5\u9501\uff09<\/strong> \u5bf9\u6574\u4e2a\u6876\u6570\u7ec4\u8fdb\u884c\u4e86\u5206\u5272\u5206\u6bb5(Segment)\uff0c\u6bcf\u4e00\u628a\u9501\u53ea\u9501\u5bb9\u5668\u5176\u4e2d\u4e00\u90e8\u5206\u6570\u636e\uff0c\u591a\u7ebf\u7a0b\u8bbf\u95ee\u5bb9\u5668\u91cc\u4e0d\u540c\u6570\u636e\u6bb5\u7684\u6570\u636e\uff0c\u5c31\u4e0d\u4f1a\u5b58\u5728\u9501\u7ade\u4e89\uff0c\u63d0\u9ad8\u5e76\u53d1\u8bbf\u95ee\u7387\u3002 <strong>\u5230\u4e86 JDK1.8 \u7684\u65f6\u5019\u5df2\u7ecf\u6452\u5f03\u4e86Segment\u7684\u6982\u5ff5\uff0c\u800c\u662f\u76f4\u63a5\u7528 Node \u6570\u7ec4+\u94fe\u8868+\u7ea2\u9ed1\u6811\u7684\u6570\u636e\u7ed3\u6784\u6765\u5b9e\u73b0\uff0c\u5e76\u53d1\u63a7\u5236\u4f7f\u7528 synchronized \u548c CAS \u6765\u64cd\u4f5c\u3002\uff08JDK1.6\u4ee5\u540e \u5bf9 synchronized\u9501\u505a\u4e86\u5f88\u591a\u4f18\u5316\uff09<\/strong> \u6574\u4e2a\u770b\u8d77\u6765\u5c31\u50cf\u662f\u4f18\u5316\u8fc7\u4e14\u7ebf\u7a0b\u5b89\u5168\u7684 HashMap\uff0c\u867d\u7136\u5728JDK1.8\u4e2d\u8fd8\u80fd\u770b\u5230 Segment \u7684\u6570\u636e\u7ed3\u6784\uff0c\u4f46\u662f\u5df2\u7ecf\u7b80\u5316\u4e86\u5c5e\u6027\uff0c\u53ea\u662f\u4e3a\u4e86\u517c\u5bb9\u65e7\u7248\u672c\uff1b\u2461 <strong>Hashtable(\u540c\u4e00\u628a\u9501)<\/strong> :\u4f7f\u7528 synchronized \u6765\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168\uff0c\u6548\u7387\u975e\u5e38\u4f4e\u4e0b\u3002\u5f53\u4e00\u4e2a\u7ebf\u7a0b\u8bbf\u95ee\u540c\u6b65\u65b9\u6cd5\u65f6\uff0c\u5176\u4ed6\u7ebf\u7a0b\u4e5f\u8bbf\u95ee\u540c\u6b65\u65b9\u6cd5\uff0c\u53ef\u80fd\u4f1a\u8fdb\u5165\u963b\u585e\u6216\u8f6e\u8be2\u72b6\u6001\uff0c\u5982\u4f7f\u7528 put \u6dfb\u52a0\u5143\u7d20\uff0c\u53e6\u4e00\u4e2a\u7ebf\u7a0b\u4e0d\u80fd\u4f7f\u7528 put \u6dfb\u52a0\u5143\u7d20\uff0c\u4e5f\u4e0d\u80fd\u4f7f\u7528 get\uff0c\u7ade\u4e89\u4f1a\u8d8a\u6765\u8d8a\u6fc0\u70c8\u6548\u7387\u8d8a\u4f4e\u3002<\/li><\/ul><\/p>\n
<strong>\u4e24\u8005\u7684\u5bf9\u6bd4\u56fe\uff1a<\/strong><\/p>\n
\u56fe\u7247\u6765\u6e90\uff1a<a href=""http:\/\/www.cnblogs.com\/chengxiao\/p\/6842045.html"">http:\/\/www.cnblogs.com\/chengxiao\/p\/6842045.html<\/a><\/p>\n
<strong>HashTable:<\/strong><\/p>\n
<img src=""http:\/\/res.mianshigee.com\/upload\/article\/20200214\/b3a8a4ab-a99f-477b-8bbe-d0cee1680337.png"" style=""width: 100%;""><br><\/p>\n
<strong>JDK1.7\u7684ConcurrentHashMap\uff1a<\/strong><\/p>\n
<img src=""http:\/\/res.mianshigee.com\/upload\/article\/20200214\/ea291c1d-d0fd-4653-a8d8-95369a40eefb.jpg"" style=""width: 100%;""><br><\/p>\n
<strong>JDK1.8\u7684ConcurrentHashMap\uff08TreeBin: \u7ea2\u9ed1\u4e8c\u53c9\u6811\u8282\u70b9 Node: \u94fe\u8868\u8282\u70b9\uff09\uff1a<\/strong><\/p>\n
<img src=""http:\/\/res.mianshigee.com\/upload\/article\/20200214\/f8dfe001-2a78-46aa-ae56-d82676f8b907.jpg"" style=""width: 100%;""><br><\/p>\n
<h2><\/h2><\/p>\n
<pre><code> "“`
\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
“`” ConcurrentHashMap \u548c Hashtable \u7684\u533a\u522b\u4e3b\u8981\u4f53\u73b0\u5728\u5b9e […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-37414","post","type-post","status-publish","format-standard","hentry","category-c"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/37414","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=37414"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/37414\/revisions"}],"predecessor-version":[{"id":37415,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/37414\/revisions\/37415"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=37414"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=37414"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=37414"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}