{"id":2273,"date":"2017-03-02T11:41:41","date_gmt":"2017-03-02T03:41:41","guid":{"rendered":"https:\/\/ai.zhousir.top\/?p=2273"},"modified":"2020-01-11T16:18:44","modified_gmt":"2020-01-11T08:18:44","slug":"%e5%85%b3%e4%ba%8earraylist%e7%9a%845%e9%81%93%e9%9d%a2%e8%af%95%e9%a2%98","status":"publish","type":"post","link":"https:\/\/ai.zhousir.top\/?p=2273","title":{"rendered":"\u5173\u4e8eArrayList\u76845\u9053\u9762\u8bd5\u9898"},"content":{"rendered":"

\"2280210133826\"<\/a><\/p>\n

\u6211\u4ee5\u9762\u8bd5\u5b98\u7684\u8eab\u4efd\u53c2\u52a0\u8fc7\u5f88\u591aJava\u7684\u9762\u8bd5\uff0c\u4ee5\u4e0b\u662f\u4e94\u4e2a\u6bd4\u8f83\u6709\u6280\u5de7\u7684\u95ee\u9898\uff0c\u6211\u53d1\u73b0\u6709\u4e9b\u521d\u7ea7\u5230\u4e2d\u7ea7\u7684Java\u7814\u53d1\u4eba\u5458\u5728\u8fd9\u4e9b\u95ee\u9898\u4e0a\u6ca1\u6709\u5b8c\u5168\u5f04\u660e\u767d\uff0c\u4f3c\u61c2\u975e\u61c2\u3002\u6240\u4ee5\u6211\u5199\u4e86\u4e00\u7bc7\u76f8\u5173\u7684\u6587\u7ae0\uff0c\u5e2e\u52a9\u521d\u7ea7Java\u7814\u53d1\u4eba\u5458\u5f04\u6e05\u695a\u8fd9\u4e9b\u95ee\u9898\u3002\u6587\u7ae0\u5217\u4e3e\u4e86\u548cJava ArrayList\u76f8\u5173\u76845\u4e2a\u6bd4\u8f83\u5177\u6709\u8ff7\u60d1\u6027\u7684\u95ee\u9898\uff0c\u6211\u76f8\u4fe1\u5982\u679c\u9762\u8bd5\u8005\u80fd\u591f\u5f88\u597d\u7684\u56de\u7b54\u51fa\u8fd9\u4e9b\u95ee\u9898\uff0c\u90a3\u4e48\u5728\u9762\u8bd5\u7684\u65f6\u5019\u4f60\u4e00\u5b9a\u80fd\u591f\u5f97\u5230\u4e0d\u9519\u7684\u5206\u6570\u3002\u5982\u679c\u4f60\u540c\u610f\u6211\u7684\u770b\u6cd5\uff0c\u6216\u8005\u9664\u4e86\u4e0b\u9762\u7684\u95ee\u9898\uff0c\u4f60\u8fd8\u6709\u5176\u4ed6\u6bd4\u8f83\u597d\u7684\u95ee\u9898\uff0c\u90a3\u4e48\u5c31\u8bf7\u8054\u7cfb\u6211\u5427\u3002<\/p>\n

1\u3001ArrayList\u7684\u5927\u5c0f\u662f\u5982\u4f55\u81ea\u52a8\u589e\u52a0\u7684\uff1f\u4f60\u80fd\u5206\u4eab\u4e00\u4e0b\u4f60\u7684\u4ee3\u7801\u5417\uff1f<\/h2>\n

\u8fd9\u662f\u6700\u6709\u6280\u5de7\u6027\u7684\u7684\u4e00\u4e2a\u95ee\u9898\uff0c\u5927\u591a\u6570\u4eba\u90fd\u65e0\u6cd5\u56de\u7b54\u3002\u4e8b\u5b9e\u4e0a\uff0c\u5f53\u6709\u4eba\u8bd5\u56fe\u5728arraylist\u4e2d\u589e\u52a0\u4e00\u4e2a\u5bf9\u8c61\u7684\u65f6\u5019\uff0cJava\u4f1a\u53bb\u68c0\u67e5arraylist\uff0c\u4ee5\u786e\u4fdd\u5df2\u5b58\u5728\u7684\u6570\u7ec4\u4e2d\u6709\u8db3\u591f\u7684\u5bb9\u91cf\u6765\u5b58\u50a8\u8fd9\u4e2a\u65b0\u7684\u5bf9\u8c61\u3002\u5982\u679c\u6ca1\u6709\u8db3\u591f\u5bb9\u91cf\u7684\u8bdd\uff0c\u90a3\u4e48\u5c31\u4f1a\u65b0\u5efa\u4e00\u4e2a\u957f\u5ea6\u66f4\u957f\u7684\u6570\u7ec4\uff0c\u65e7\u7684\u6570\u7ec4\u5c31\u4f1a\u4f7f\u7528Arrays.copyOf\u65b9\u6cd5\u88ab\u590d\u5236\u5230\u65b0\u7684\u6570\u7ec4\u4e2d\u53bb\uff0c\u73b0\u6709\u7684\u6570\u7ec4\u5f15\u7528\u6307\u5411\u4e86\u65b0\u7684\u6570\u7ec4\u3002\u770b\u5982\u4e0b\u7684\u4ee3\u7801\u6bb5\uff08\u6458\u81eaGrepCode.com\u4e2d\u7684Java ArrayList Code<\/a>\uff09\uff1a<\/p>\n

\n
\n\n\n\n
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20<\/div>\n<\/td>\n
\n
\n
\/\/ArrayList Add\u65b9\u6cd5\uff1a<\/code><\/div>\n
public<\/code> boolean<\/code> add(E e){<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>ensureCapacity(size+<\/code>1<\/code>); <\/code>\/\/Increment modCount!!<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>elementData[size++] = e;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>return<\/code> true<\/code>;<\/code><\/div>\n
}<\/code><\/div>\n
<\/div>\n
\/\/ensureCapacity\u65b9\u6cd5\uff1a\u5904\u7406ArrayList\u7684\u5927\u5c0f<\/code><\/div>\n
public<\/code> void<\/code> ensureCapacity(<\/code>int<\/code> minCapacity) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>modCount++;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>int<\/code> oldCapacity = elementData.length;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>if<\/code> (minCapacity > oldCapacity) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>Object oldData[] = elementData;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>int<\/code> newCapacity = (oldCapacity * <\/code>3<\/code>)\/<\/code>2<\/code> + <\/code>1<\/code>;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>if<\/code> (newCapacity < minCapacity)<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>newCapacity = minCapacity;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>\/\/ minCapacity is usually close to size, so this is a win:<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>elementData = Arrays.copyOf(elementData, newCapacity);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>}<\/code><\/div>\n
}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

\u8bf7\u6ce8\u610f\u8fd9\u6837\u4e00\u4e2a\u60c5\u51b5\uff1a\u65b0\u5efa\u4e86\u4e00\u4e2a\u6570\u7ec4\uff1b\u65e7\u6570\u7ec4\u7684\u5bf9\u8c61\u88ab\u590d\u5236\u5230\u4e86\u65b0\u7684\u6570\u7ec4\u4e2d\uff0c\u5e76\u4e14\u73b0\u6709\u7684\u6570\u7ec4\u6307\u5411\u65b0\u7684\u6570\u7ec4\u3002<\/p>\n

2\u3001\u4ec0\u4e48\u60c5\u51b5\u4e0b\u4f60\u4f1a\u4f7f\u7528ArrayList\uff1f\u4ec0\u4e48\u65f6\u5019\u4f60\u4f1a\u9009\u62e9LinkedList\uff1f<\/h2>\n

\u8fd9\u53c8\u662f\u4e00\u4e2a\u5927\u591a\u6570\u9762\u8bd5\u8005\u90fd\u4f1a\u56f0\u60d1\u7684\u95ee\u9898\u3002\u591a\u6570\u60c5\u51b5\u4e0b\uff0c\u5f53\u4f60\u9047\u5230\u8bbf\u95ee\u5143\u7d20\u6bd4\u63d2\u5165\u6216\u8005\u662f\u5220\u9664\u5143\u7d20\u66f4\u52a0\u9891\u7e41\u7684\u65f6\u5019\uff0c\u4f60\u5e94\u8be5\u4f7f\u7528ArrayList\u3002\u53e6\u5916\u4e00\u65b9\u9762\uff0c\u5f53\u4f60\u5728\u67d0\u4e2a\u7279\u522b\u7684\u7d22\u5f15\u4e2d\uff0c\u63d2\u5165\u6216\u8005\u662f\u5220\u9664\u5143\u7d20\u66f4\u52a0\u9891\u7e41\uff0c\u6216\u8005\u4f60\u538b\u6839\u5c31\u4e0d\u9700\u8981\u8bbf\u95ee\u5143\u7d20\u7684\u65f6\u5019\uff0c\u4f60\u4f1a\u9009\u62e9LinkedList\u3002\u8fd9\u91cc\u7684\u4e3b\u8981\u539f\u56e0\u662f\uff0c\u5728ArrayList\u4e2d\u8bbf\u95ee\u5143\u7d20\u7684\u6700\u7cdf\u7cd5\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u662f\u201d1\u2033\uff0c\u800c\u5728LinkedList\u4e2d\u53ef\u80fd\u5c31\u662f\u201dn\u201d\u4e86\u3002\u5728ArrayList\u4e2d\u589e\u52a0\u6216\u8005\u5220\u9664\u67d0\u4e2a\u5143\u7d20\uff0c\u901a\u5e38\u4f1a\u8c03\u7528System.arraycopy\u65b9\u6cd5\uff0c\u8fd9\u662f\u4e00\u79cd\u6781\u4e3a\u6d88\u8017\u8d44\u6e90\u7684\u64cd\u4f5c\uff0c\u56e0\u6b64\uff0c\u5728\u9891\u7e41\u7684\u63d2\u5165\u6216\u8005\u662f\u5220\u9664\u5143\u7d20\u7684\u60c5\u51b5\u4e0b\uff0cLinkedList\u7684\u6027\u80fd\u4f1a\u66f4\u52a0\u597d\u4e00\u70b9\u3002<\/p>\n

3\u3001\u5f53\u4f20\u9012ArrayList\u5230\u67d0\u4e2a\u65b9\u6cd5\u4e2d\uff0c\u6216\u8005\u67d0\u4e2a\u65b9\u6cd5\u8fd4\u56deArrayList\uff0c\u4ec0\u4e48\u65f6\u5019\u8981\u8003\u8651\u5b89\u5168\u9690\u60a3\uff1f\u5982\u4f55\u4fee\u590d\u5b89\u5168\u8fdd\u89c4\u8fd9\u4e2a\u95ee\u9898\u5462\uff1f<\/h2>\n

\u5f53array\u88ab\u5f53\u505a\u53c2\u6570\u4f20\u9012\u5230\u67d0\u4e2a\u65b9\u6cd5\u4e2d\uff0c\u5982\u679carray\u5728\u6ca1\u6709\u88ab\u590d\u5236\u7684\u60c5\u51b5\u4e0b\u76f4\u63a5\u88ab\u5206\u914d\u7ed9\u4e86\u6210\u5458\u53d8\u91cf\uff0c\u90a3\u4e48\u5c31\u53ef\u80fd\u53d1\u751f\u8fd9\u79cd\u60c5\u51b5\uff0c\u5373\u5f53\u539f\u59cb\u7684\u6570\u7ec4\u88ab\u8c03\u7528\u7684\u65b9\u6cd5\u6539\u53d8\u7684\u65f6\u5019\uff0c\u4f20\u9012\u5230\u8fd9\u4e2a\u65b9\u6cd5\u4e2d\u7684\u6570\u7ec4\u4e5f\u4f1a\u6539\u53d8\u3002\u4e0b\u9762\u7684\u8fd9\u6bb5\u4ee3\u7801\u5c55\u793a\u7684\u5c31\u662f\u5b89\u5168\u8fdd\u89c4\u4ee5\u53ca\u5982\u4f55\u4fee\u590d\u8fd9\u4e2a\u95ee\u9898\u3002<\/p>\n

ArrayList\u88ab\u76f4\u63a5\u8d4b\u7ed9\u6210\u5458\u53d8\u91cf\u2014\u2014\u5b89\u5168\u9690\u60a3\uff1a<\/p>\n

\"\"<\/p>\n

\u4fee\u590d\u8fd9\u4e2a\u5b89\u5168\u9690\u60a3\uff1a<\/p>\n

\"\"<\/h1>\n

4\u3001\u5982\u4f55\u590d\u5236\u67d0\u4e2aArrayList\u5230\u53e6\u4e00\u4e2aArrayList\u4e2d\u53bb\uff1f\u5199\u51fa\u4f60\u7684\u4ee3\u7801\uff1f<\/h2>\n

\u4e0b\u9762\u5c31\u662f\u628a\u67d0\u4e2aArrayList\u590d\u5236\u5230\u53e6\u4e00\u4e2aArrayList\u4e2d\u53bb\u7684\u51e0\u79cd\u6280\u672f\uff1a<\/p>\n

    \n
  1. \u4f7f\u7528clone()\u65b9\u6cd5\uff0c\u6bd4\u5982ArrayList newArray = oldArray.clone();<\/li>\n
  2. \u4f7f\u7528ArrayList\u6784\u9020\u65b9\u6cd5\uff0c\u6bd4\u5982\uff1aArrayList myObject = new ArrayList(myTempObject);<\/li>\n
  3. \u4f7f\u7528Collection\u7684copy\u65b9\u6cd5\u3002<\/li>\n<\/ol>\n

    \u6ce8\u610f1\u548c2\u662f\u6d45\u62f7\u8d1d(shallow copy)\u3002<\/p>\n

    5\u3001\u5728\u7d22\u5f15\u4e2dArrayList\u7684\u589e\u52a0\u6216\u8005\u5220\u9664\u67d0\u4e2a\u5bf9\u8c61\u7684\u8fd0\u884c\u8fc7\u7a0b\uff1f\u6548\u7387\u5f88\u4f4e\u5417\uff1f\u89e3\u91ca\u4e00\u4e0b\u4e3a\u4ec0\u4e48\uff1f<\/h2>\n

    \u5728ArrayList\u4e2d\u589e\u52a0\u6216\u8005\u662f\u5220\u9664\u5143\u7d20\uff0c\u8981\u8c03\u7528System.arraycopy\u8fd9\u79cd\u6548\u7387\u5f88\u4f4e\u7684\u64cd\u4f5c\uff0c\u5982\u679c\u9047\u5230\u4e86\u9700\u8981\u9891\u7e41\u63d2\u5165\u6216\u8005\u662f\u5220\u9664\u7684\u65f6\u5019\uff0c\u4f60\u53ef\u4ee5\u9009\u62e9\u5176\u4ed6\u7684Java\u96c6\u5408\uff0c\u6bd4\u5982LinkedList\u3002\u770b\u4e00\u4e0b\u4e0b\u9762\u7684\u4ee3\u7801\uff1a<\/p>\n

    \u5728ArrayList\u7684\u67d0\u4e2a\u7d22\u5f15i\u5904\u6dfb\u52a0\u5143\u7d20\uff1a<\/p>\n

    \"\"<\/p>\n

    \u5220\u9664ArrayList\u7684\u67d0\u4e2a\u7d22\u5f15i\u5904\u7684\u5143\u7d20\uff1a<\/p>\n

    \"\"<\/p>\n

    \u539f\u6587\u94fe\u63a5\uff1a\u00a0vitalflux<\/a>\u00a0\u7ffb\u8bd1\uff1a\u00a0ImportNew.com\u00a0<\/a>–\u00a0kobekillerjun<\/a>
    \n\u8bd1\u6587\u94fe\u63a5\uff1a\u00a0    http:\/\/www.importnew.com\/9928.html<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

    \u6211\u4ee5\u9762\u8bd5\u5b98\u7684\u8eab\u4efd\u53c2\u52a0\u8fc7\u5f88\u591aJava\u7684\u9762\u8bd5\uff0c\u4ee5\u4e0b\u662f\u4e94\u4e2a\u6bd4\u8f83\u6709\u6280\u5de7\u7684\u95ee\u9898\uff0c\u6211\u53d1\u73b0\u6709\u4e9b\u521d\u7ea7\u5230\u4e2d\u7ea7\u7684Java\u7814\u53d1\u4eba\u5458\u5728 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[74],"tags":[],"_links":{"self":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/2273"}],"collection":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2273"}],"version-history":[{"count":4,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/2273\/revisions"}],"predecessor-version":[{"id":2371,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/2273\/revisions\/2371"}],"wp:attachment":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2273"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2273"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2273"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}