{"id":60526,"date":"2026-01-15T20:05:36","date_gmt":"2026-01-15T12:05:36","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/60526.html"},"modified":"2026-01-15T20:05:36","modified_gmt":"2026-01-15T12:05:36","slug":"%e3%80%90vector%e3%80%91%e3%80%90concurrenthashmap%e3%80%91%e7%ba%bf%e7%a8%8b%e5%ae%89%e5%85%a8","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/60526.html","title":{"rendered":"\u3010Vector\u3011\u3010ConCurrentHashMap\u3011\u7ebf\u7a0b\u5b89\u5168"},"content":{"rendered":"<p>\u8fd9\u4e24\u4e2a\u96c6\u5408&#xff0c;\u662f Java \u4e2d\u7ebf\u7a0b\u5b89\u5168\u96c6\u5408\u7684\u5178\u578b\u4ee3\u8868&#xff0c;\u4e5f\u662f\u9762\u8bd5\u3010\u9ad8\u9891\u539f\u9898\u3011&#xff1a;Vector\u662f\u600e\u4e48\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168\u7684&#xff1f;\u3001ConcurrentHashMap\u7ebf\u7a0b\u5b89\u5168\u7684\u5b9e\u73b0\u539f\u7406&#xff1f;\u3001HashMap\u548cConcurrentHashMap\u7684\u533a\u522b&#xff1f;<\/p>\n<p>1.Vector \u662f ArrayList \u7684\u7ebf\u7a0b\u5b89\u5168\u7248&#xff0c;ConcurrentHashMap \u662f HashMap \u7684\u7ebf\u7a0b\u5b89\u5168\u7248\u3002Vector \u662f\u901a\u8fc7\u300c\u5728\u6240\u6709\u5bf9\u5916\u7684\u516c\u6709\u65b9\u6cd5\u4e0a&#xff0c;\u76f4\u63a5\u52a0 synchronized \u540c\u6b65\u9501\u300d\u5b9e\u73b0\u7684\u7ebf\u7a0b\u5b89\u5168\u3002Vector \u7684\u5e95\u5c42\u548c ArrayList \u5b8c\u5168\u4e00\u6837&#xff0c;\u90fd\u662f\u57fa\u4e8e\u6570\u7ec4\u5b9e\u73b0&#xff0c;\u533a\u522b\u53ea\u5728\u65b9\u6cd5\u7684\u4fee\u9970\u7b26\u4e0a&#xff1a;ArrayList \u7684\u6240\u6709\u65b9\u6cd5\u90fd\u662f\u666e\u901a\u65b9\u6cd5&#xff0c;\u65e0\u4efb\u4f55\u9501&#xff1b;Vector \u7684\u6240\u6709\u6838\u5fc3\u65b9\u6cd5&#xff08;\u589e\u5220\u6539\u67e5\u3001\u6269\u5bb9\u3001\u904d\u5386&#xff09;&#xff0c;\u90fd\u88ab synchronized \u5173\u952e\u5b57\u4fee\u9970\u3002<\/p>\n<p>\/\/ Vector\u7684\u6dfb\u52a0\u5143\u7d20\u65b9\u6cd5&#xff1a;\u52a0\u4e86synchronized<br \/>\npublic synchronized boolean add(E e) {<br \/>\n    modCount&#043;&#043;;<br \/>\n    ensureCapacityHelper(elementCount &#043; 1);<br \/>\n    elementData[elementCount&#043;&#043;] &#061; e;<br \/>\n    return true;<br \/>\n}<\/p>\n<p>\/\/ Vector\u7684\u5220\u9664\u5143\u7d20\u65b9\u6cd5&#xff1a;\u52a0\u4e86synchronized<br \/>\npublic synchronized E remove(int index) {<br \/>\n    modCount&#043;&#043;;<br \/>\n    if (index &gt;&#061; elementCount)<br \/>\n        throw new ArrayIndexOutOfBoundsException(index);<br \/>\n    E oldValue &#061; elementData(index);<br \/>\n    int numMoved &#061; elementCount &#8211; index &#8211; 1;<br \/>\n    if (numMoved &gt; 0)<br \/>\n        System.arraycopy(elementData, index&#043;1, elementData, index, numMoved);<br \/>\n    elementData[&#8211;elementCount] &#061; null;<br \/>\n    return oldValue;<br \/>\n}<\/p>\n<p>\/\/ Vector\u7684\u83b7\u53d6\u5143\u7d20\u65b9\u6cd5&#xff1a;\u52a0\u4e86synchronized<br \/>\npublic synchronized E get(int index) {<br \/>\n    if (index &gt;&#061; elementCount)<br \/>\n        throw new ArrayIndexOutOfBoundsException(index);<br \/>\n    return elementData(index);<br \/>\n}<\/p>\n<h5>\u9501\u7684\u672c\u8d28&#xff1a;Vector \u7684\u9501\u662f\u300c\u5bf9\u8c61\u7ea7\u522b\u7684\u72ec\u5360\u9501\u300d<\/h5>\n<p>synchronized \u52a0\u5728\u666e\u901a\u65b9\u6cd5\u4e0a&#xff0c;\u7b49\u4ef7\u4e8e\u7ed9 Vector\u5bf9\u8c61\u672c\u8eab \u52a0\u9501 \u2192 \u4e00\u628a\u9501\u9501\u4f4f\u6574\u4e2a Vector \u5bf9\u8c61\u3002<\/p>\n<ul>\n<li>\u5f53\u4efb\u610f\u4e00\u4e2a\u7ebf\u7a0b\u8c03\u7528 Vector \u7684\u4efb\u610f\u4e00\u4e2a\u65b9\u6cd5&#xff08;add\/remove\/get&#xff09;\u65f6&#xff0c;\u90fd\u4f1a\u72ec\u5360\u8fd9\u628a\u9501&#xff1b;<\/li>\n<li>\u6b64\u65f6\u5176\u4ed6\u7ebf\u7a0b&#xff0c;\u65e0\u8bba\u60f3\u8c03\u7528 Vector \u7684\u4efb\u4f55\u65b9\u6cd5&#xff0c;\u90fd\u4f1a\u88ab\u963b\u585e\u7b49\u5f85&#xff0c;\u76f4\u5230\u5f53\u524d\u7ebf\u7a0b\u91ca\u653e\u9501&#xff1b;<\/li>\n<li>\u6bd4\u5982&#xff1a;\u7ebf\u7a0b A \u8c03\u7528add()&#xff0c;\u7ebf\u7a0b B \u8c03\u7528get()&#xff0c;B \u4e5f\u4f1a\u88ab\u963b\u585e&#xff0c;\u5fc5\u987b\u7b49 A \u6267\u884c\u5b8c\u3002<\/li>\n<\/ul>\n<h4>2. Vector \u7ebf\u7a0b\u5b89\u5168\u7684\u4f18\u7f3a\u70b9&#xff08;\u9762\u8bd5\u5fc5\u8003&#xff0c;\u7b54\u5168\u52a0\u5206&#xff09;<\/h4>\n<h5>\u4f18\u70b9&#xff1a;\u5b9e\u73b0\u7b80\u5355\u3001\u7edd\u5bf9\u7ebf\u7a0b\u5b89\u5168<\/h5>\n<p>synchronized \u662f JDK \u539f\u751f\u7684\u540c\u6b65\u9501&#xff0c;\u4fdd\u8bc1\u4e86\u6240\u6709\u64cd\u4f5c\u7684\u539f\u5b50\u6027&#xff0c;\u53ea\u8981\u7528 Vector&#xff0c;\u5728\u591a\u7ebf\u7a0b\u4e0b\u65e0\u8bba\u600e\u4e48\u64cd\u4f5c&#xff0c;\u90fd\u4e0d\u4f1a\u51fa\u73b0\u6570\u636e\u9519\u4e71\u3001\u5e76\u53d1\u4fee\u6539\u5f02\u5e38&#xff0c;\u5b89\u5168\u6027\u65e0\u4efb\u4f55\u95ee\u9898\u3002<\/p>\n<h5>\u7f3a\u70b9&#xff1a;\u6548\u7387\u6781\u4f4e&#xff0c;\u6027\u80fd\u5dee&#xff08;\u81f4\u547d\u7f3a\u70b9&#xff09; \u2192 \u5f00\u53d1\u4e2d\u51e0\u4e4e\u4e0d\u7528 Vector<\/h5>\n<p>\u8fd9\u662f Vector \u7684\u6838\u5fc3\u95ee\u9898&#xff0c;\u4e5f\u662f\u4e3a\u4ec0\u4e48\u73b0\u5728\u9879\u76ee\u4e2d\u5f88\u5c11\u7528 Vector\u7684\u539f\u56e0&#xff0c;\u6839\u6e90\u5c31\u662f\u5b83\u7684\u9501\u673a\u5236&#xff1a;\u9501\u7c92\u5ea6\u592a\u5927&#xff01;<\/p>\n<ul>\n<li>\u9501\u7c92\u5ea6&#xff1a;\u6307\u300c\u88ab\u9501\u4f4f\u7684\u8d44\u6e90\u8303\u56f4\u300d&#xff0c;Vector \u662f\u7c97\u7c92\u5ea6\u9501&#xff08;\u9501\u6574\u4e2a\u5bf9\u8c61&#xff09;&#xff1b;<\/li>\n<li>\u95ee\u9898 1&#xff1a;\u8bfb\u5199\u4e92\u65a5 \u2192 \u54ea\u6015\u662f\u300c\u53ea\u8bfb\u64cd\u4f5c\u300d&#xff08;get \u67e5\u8be2&#xff09;&#xff0c;\u4e5f\u4f1a\u88ab\u52a0\u9501&#xff0c;\u591a\u4e2a\u7ebf\u7a0b\u5e76\u53d1\u67e5\u8be2\u65f6&#xff0c;\u53ea\u80fd\u4e32\u884c\u6267\u884c&#xff0c;\u67e5\u8be2\u6548\u7387\u66b4\u8dcc&#xff1b;<\/li>\n<li>\u95ee\u9898 2&#xff1a;\u64cd\u4f5c\u4e92\u65a5 \u2192 \u589e\u5220\u6539\u67e5\u6240\u6709\u64cd\u4f5c\u90fd\u62a2\u540c\u4e00\u628a\u9501&#xff0c;\u54ea\u6015\u4e24\u4e2a\u7ebf\u7a0b\u64cd\u4f5c Vector \u7684\u4e0d\u540c\u4f4d\u7f6e\u7684\u5143\u7d20&#xff0c;\u4e5f\u4f1a\u4e92\u76f8\u963b\u585e&#xff1b;<\/li>\n<\/ul>\n<p>\u901a\u4fd7\u6bd4\u55bb&#xff1a;Vector \u5c31\u50cf\u4e00\u4e2a\u53ea\u6709\u4e00\u4e2a\u6536\u94f6\u53f0\u7684\u8d85\u5e02&#xff0c;\u4e0d\u7ba1\u4f60\u662f\u4e70\u4e1c\u897f\u3001\u9000\u8d27\u3001\u7ed3\u8d26&#xff0c;\u90fd\u8981\u6392\u961f\u7b49\u8fd9\u4e00\u4e2a\u6536\u94f6\u53f0&#xff0c;\u6548\u7387\u6781\u4f4e\u3002<\/p>\n<p>3.ConcurrentHashMap \u662f Java \u4e2d\u5e76\u53d1\u96c6\u5408\u7684\u738b\u8005&#xff0c;\u662f HashMap \u7684\u7ebf\u7a0b\u5b89\u5168\u7248&#xff0c;\u4e5f\u662f\u5f00\u53d1\u4e2d\u591a\u7ebf\u7a0b\u4e0b\u64cd\u4f5c\u952e\u503c\u5bf9\u7684\u9996\u9009\u3002\u6838\u5fc3\u4f18\u52bf&#xff1a;ConcurrentHashMap \u89e3\u51b3\u4e86 Vector \u7684\u75db\u70b9 \u2192 \u7ebf\u7a0b\u5b89\u5168\u7684\u540c\u65f6&#xff0c;\u6548\u7387\u6781\u9ad8&#xff01;<\/p>\n<h5>\u6838\u5fc3\u8bbe\u8ba1&#xff1a;\u5206\u6bb5\u9501&#xff08;Segment&#xff09;\u673a\u5236 \u2192 \u628a HashMap\u300c\u5206\u5757\u52a0\u9501\u300d<\/h5>\n<p>JDK7 \u7684 ConcurrentHashMap&#xff0c;\u5728 HashMap \u7684\u57fa\u7840\u4e0a&#xff0c;\u505a\u4e86\u4e00\u5c42\u5c01\u88c5&#xff1a;<\/p>\n<li>\u5185\u90e8\u7ef4\u62a4\u4e86\u4e00\u4e2a Segment[] \u5206\u6bb5\u6570\u7ec4&#xff0c;\u4e00\u4e2a Segment \u5c31\u662f\u4e00\u4e2a\u300c\u5c0f HashMap\u300d&#xff1b;<\/li>\n<li>\u6bcf\u4e2a Segment \u90fd\u7ee7\u627f\u4e86 ReentrantLock&#xff08;\u53ef\u91cd\u5165\u9501&#xff09;&#xff0c;\u6bcf\u4e2a Segment \u90fd\u6709\u81ea\u5df1\u72ec\u7acb\u7684\u4e00\u628a\u9501&#xff1b;<\/li>\n<li>\u5f53\u7ebf\u7a0b\u8981\u64cd\u4f5c ConcurrentHashMap \u65f6&#xff0c;\u53ea\u4f1a\u9501\u4f4f\u300c\u5f53\u524d\u5143\u7d20\u6240\u5728\u7684 Segment\u300d&#xff0c;\u4e0d\u4f1a\u9501\u4f4f\u6574\u4e2a\u96c6\u5408\u3002<\/li>\n<li>\u6bd4\u55bb&#xff1a;ConcurrentHashMap&#xff08;JDK7&#xff09;\u5c31\u50cf\u4e00\u4e2a\u6709\u591a\u4e2a\u6536\u94f6\u53f0\u7684\u8d85\u5e02&#xff0c;\u6bcf\u4e2a\u6536\u94f6\u53f0\u5bf9\u5e94\u4e00\u4e2a\u533a\u57df\u7684\u5546\u54c1&#xff0c;\u4f60\u4e70\u54ea\u4e2a\u533a\u57df\u7684\u5546\u54c1&#xff0c;\u5c31\u53ea\u5728\u8fd9\u4e2a\u6536\u94f6\u53f0\u6392\u961f&#xff0c;\u4e0d\u4f1a\u5f71\u54cd\u5176\u4ed6\u6536\u94f6\u53f0\u7684\u4eba\u3002<img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"750\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/01\/20260115120535-6968d80f6b63f.png\" width=\"1495\" \/><\/li>\n<p>HashMap\u3001Hashtable\u3001ConcurrentHashMap \u7684\u533a\u522b&#xff1f;<\/p>\n<ul>\n<li>HashMap&#xff1a;\u7ebf\u7a0b\u4e0d\u5b89\u5168&#xff0c;\u6548\u7387\u9ad8&#xff0c;\u5e95\u5c42\u6570\u7ec4 &#043; \u94fe\u8868 &#043; \u7ea2\u9ed1\u6811&#xff0c;\u5141\u8bb8 key\/value \u4e3a null&#xff1b;<\/li>\n<li>Hashtable&#xff1a;\u7ebf\u7a0b\u5b89\u5168&#xff0c;\u6548\u7387\u6781\u4f4e&#xff08;\u5168\u8868\u9501&#xff09;&#xff0c;\u5e95\u5c42\u6570\u7ec4 &#043; \u94fe\u8868&#xff0c;\u4e0d\u5141\u8bb8 key\/value \u4e3a null&#xff1b;<\/li>\n<li>ConcurrentHashMap&#xff1a;\u7ebf\u7a0b\u5b89\u5168&#xff0c;\u6548\u7387\u6781\u9ad8&#xff08;\u7ec6\u7c92\u5ea6\u9501&#xff09;&#xff0c;\u5e95\u5c42\u6570\u7ec4 &#043; \u94fe\u8868 &#043; \u7ea2\u9ed1\u6811&#xff0c;\u4e0d\u5141\u8bb8 key\/value \u4e3a null&#xff0c;\u662f\u5f00\u53d1\u4e2d\u591a\u7ebf\u7a0b\u4e0b\u7684\u9996\u9009\u3002<\/li>\n<\/ul>\n<p>\u4e3a\u4ec0\u4e48\u5f00\u53d1\u4e2d\u4e0d\u7528 Vector \u548c Hashtable&#xff0c;\u800c\u7528 ConcurrentHashMap&#xff1f;<\/p>\n<p>\u56e0\u4e3a Vector \u548c Hashtable \u662f\u7c97\u7c92\u5ea6\u9501&#xff0c;\u9501\u7c92\u5ea6\u592a\u5927&#xff0c;\u6548\u7387\u6781\u4f4e&#xff0c;\u5728\u9ad8\u5e76\u53d1\u573a\u666f\u4e0b\u6027\u80fd\u66b4\u8dcc&#xff1b;\u800c ConcurrentHashMap \u662f\u7ec6\u7c92\u5ea6\u9501&#xff0c;\u517c\u987e\u7ebf\u7a0b\u5b89\u5168\u548c\u6548\u7387&#xff0c;\u662f\u4e13\u95e8\u4e3a\u9ad8\u5e76\u53d1\u8bbe\u8ba1\u7684\u96c6\u5408&#xff0c;\u6027\u80fd\u8fdc\u8d85 Vector \u548c Hashtable\u3002<\/p>\n<p>ConcurrentHashMap \u4e3a\u4ec0\u4e48\u4e0d\u5141\u8bb8 key\/value \u4e3a null&#xff1f;<\/p>\n<p>\u4e3a\u4e86\u907f\u514d\u6b67\u4e49&#xff01;\u56e0\u4e3a ConcurrentHashMap \u7684 get \u65b9\u6cd5\u65e0\u9501&#xff0c;\u5982\u679c\u5141\u8bb8 null&#xff0c;\u5f53 get \u8fd4\u56de null \u65f6&#xff0c;\u65e0\u6cd5\u5224\u65ad\u662f\u300ckey \u4e0d\u5b58\u5728\u8fd4\u56de null\u300d\u8fd8\u662f\u300ckey \u5b58\u5728\u4f46 value \u5c31\u662f null\u300d&#xff0c;\u800c HashMap \u662f\u5355\u7ebf\u7a0b\u7684&#xff0c;\u53ef\u4ee5\u901a\u8fc7 containsKey \u5224\u65ad&#xff0c;ConcurrentHashMap \u662f\u591a\u7ebf\u7a0b\u7684&#xff0c;containsKey \u548c get \u4e4b\u95f4\u53ef\u80fd\u6709\u7ebf\u7a0b\u4fee\u6539\u6570\u636e&#xff0c;\u5224\u65ad\u7ed3\u679c\u4e0d\u53ef\u9760&#xff0c;\u56e0\u6b64\u76f4\u63a5\u7981\u6b62 null \u503c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8fd9\u4e24\u4e2a\u96c6\u5408&#xff0c;\u662f Java \u4e2d\u7ebf\u7a0b\u5b89\u5168\u96c6\u5408\u7684\u5178\u578b\u4ee3\u8868&#xff0c;\u4e5f\u662f\u9762\u8bd5\u3010\u9ad8\u9891\u539f\u9898\u3011&#xff1a;Vector\u662f\u600e\u4e48\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168\u7684&#xff1f;\u3001ConcurrentHashMap\u7ebf\u7a0b\u5b89\u5168\u7684\u5b9e\u73b0\u539f\u7406&#xff1f;\u3001HashMap\u548cConcurrentHashMap\u7684\u533a\u522b&#xff1f;1.Vector \u662f ArrayList \u7684\u7ebf\u7a0b\u5b89\u5168\u7248&#xff0c;ConcurrentHashMap \u662f HashMap \u7684\u7ebf\u7a0b\u5b89\u5168\u7248\u3002Vector 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