{"id":271309,"date":"2024-05-16T12:50:17","date_gmt":"2024-05-16T04:50:17","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/271309.html"},"modified":"2024-05-16T12:50:29","modified_gmt":"2024-05-16T04:50:29","slug":"java-web-%e9%a1%b9%e7%9b%ae%e5%a6%82%e4%bd%95%e7%bb%99%e6%95%b0%e7%bb%84%e9%97%b4%e8%b5%8b%e5%80%bc","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/271309.html","title":{"rendered":"Java web \u9879\u76ee\u5982\u4f55\u7ed9\u6570\u7ec4\u95f4\u8d4b\u503c"},"content":{"rendered":"

\"Java<\/p>\n

\u6570\u7ec4\u95f4\u8d4b\u503c\u5728Java Web\u9879\u76ee\u4e2d\u662f\u4e00\u9879\u57fa\u7840\u4e14\u5e38\u89c1\u7684\u64cd\u4f5c\uff0c\u53ef\u4ee5\u901a\u8fc7\u5faa\u73af\u590d\u5236\u3001System.arraycopy()<\/code>\u65b9\u6cd5\u3001Arrays.copyOf()<\/code>\u65b9\u6cd5\u3001\u514b\u9686\uff08clone()<\/code>\uff09\u65b9\u6cd5\u6765\u5b9e\u73b0<\/strong>\u3002\u5728\u8fd9\u4e9b\u65b9\u6cd5\u4e2d\uff0cSystem.arraycopy()<\/code>\u662f\u4e00\u79cd\u9ad8\u6548\u7684\u6570\u7ec4\u590d\u5236\u65b9\u6cd5\uff0c\u5b83\u662f\u4e00\u4e2anative\u65b9\u6cd5\uff0c\u53ef\u4ee5\u76f4\u63a5\u64cd\u4f5c\u5185\u5b58\u4e2d\u7684\u6570\u7ec4\u6570\u636e\u3002\u4f7f\u7528System.arraycopy()<\/code>\u65f6\uff0c\u53ef\u4ee5\u6307\u5b9a\u539f\u6570\u7ec4\u3001\u76ee\u6807\u6570\u7ec4\u3001\u590d\u5236\u7684\u8d77\u59cb\u4f4d\u7f6e\u4ee5\u53ca\u590d\u5236\u7684\u957f\u5ea6\uff0c\u56e0\u800c\u63d0\u4f9b\u4e86\u5f88\u5927\u7684\u7075\u6d3b\u6027\uff0c\u540c\u65f6\u5176\u6267\u884c\u901f\u5ea6\u4e5f\u5feb\u4e8e\u7b80\u5355\u7684\u5faa\u73af\u590d\u5236\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u5faa\u73af\u8d4b\u503c<\/h3>\n<\/p>\n

\u5728Java\u4e2d\uff0c\u6700\u7b80\u5355\u76f4\u89c2\u7684\u65b9\u6cd5\u662f\u4f7f\u7528\u5faa\u73af\u904d\u5386\u539f\u6570\u7ec4\uff0c\u5c06\u503c\u9010\u4e2a\u8d4b\u7ed9\u76ee\u6807\u6570\u7ec4\u3002\u8fd9\u79cd\u65b9\u5f0f\u7b80\u5355\u3001\u6613\u61c2\uff0c\u4f46\u6548\u7387\u4e0d\u662f\u6700\u9ad8\u7684\uff0c\u7279\u522b\u662f\u5728\u6570\u7ec4\u957f\u5ea6\u5f88\u5927\u65f6\u3002<\/p>\n<\/p>\n

public void copyArrayByLoop(int[] src, int[] dest) {<\/p>\n
    for (int i = 0; i < src.length; i++) {<\/p>\n
        dest[i] = src[i];<\/p>\n
    }<\/p>\n
}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e8c\u3001SYSTEM.ARRAYCOPY()\u65b9\u6cd5<\/h3>\n<\/p>\n
\u4f7f\u7528System.arraycopy()<\/code>\u65b9\u6cd5\u53ef\u4ee5\u66f4\u9ad8\u6548\u5730\u8fdb\u884c\u6570\u7ec4\u8d4b\u503c\u3002\u5b83\u662f\u4e00\u4e2anative\u65b9\u6cd5\uff0c\u53ef\u4ee5\u63d0\u4f9b\u6bd4\u5faa\u73af\u8d4b\u503c\u66f4\u5feb\u7684\u6027\u80fd\u3002\u9700\u8981\u4f20\u5165\u6e90\u6570\u7ec4\u3001\u8d77\u59cb\u4f4d\u7f6e\u3001\u76ee\u6807\u6570\u7ec4\u3001\u76ee\u6807\u6570\u7ec4\u8d77\u59cb\u4f4d\u7f6e\u548c\u590d\u5236\u957f\u5ea6\u3002<\/p>\n<\/p>\n
public void copyArrayBySystem(int[] src, int[] dest) {<\/p>\n
    System.arraycopy(src, 0, dest, 0, src.length);<\/p>\n
}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e09\u3001ARRAYS.COPYOF()\u65b9\u6cd5<\/h3>\n<\/p>\n
Arrays.copyOf()<\/code>\u65b9\u6cd5\u662fArrays\u7c7b\u63d0\u4f9b\u7684\u4e00\u4e2a\u4fbf\u5229\u65b9\u6cd5\uff0c\u5b83\u53ef\u4ee5\u5728\u590d\u5236\u6570\u7ec4\u7684\u540c\u65f6\uff0c\u6839\u636e\u9700\u8981\u6269\u5c55\u6216\u8005\u622a\u65ad\u76ee\u6807\u6570\u7ec4\u3002\u8fd9\u79cd\u65b9\u6cd5\u7684\u4ee3\u7801\u53ef\u8bfb\u6027\u66f4\u9ad8\uff0c\u7528\u8d77\u6765\u4e5f\u5f88\u65b9\u4fbf\u3002<\/p>\n<\/p>\n
public int[] copyArrayByArraysCopyOf(int[] src) {<\/p>\n
    return Arrays.copyOf(src, src.length);<\/p>\n
}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u56db\u3001\u514b\u9686\u65b9\u6cd5<\/h3>\n<\/p>\n
\u6570\u7ec4\u7684\u514b\u9686\u53ef\u4ee5\u901a\u8fc7\u8c03\u7528\u6570\u7ec4\u5bf9\u8c61\u7684clone()<\/code>\u65b9\u6cd5\u6765\u5b9e\u73b0\uff0c\u5b83\u4f1a\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684\u6570\u7ec4\u5bf9\u8c61\uff0c\u5185\u5bb9\u662f\u539f\u6570\u7ec4\u7684\u4e00\u4e2a\u526f\u672c\u3002\u8fd9\u662f\u5b9e\u73b0\u6570\u7ec4\u62f7\u8d1d\u7684\u53c8\u4e00\u79cd\u7b80\u5355\u65b9\u6cd5\u3002<\/p>\n<\/p>\n
public int[] cloneArray(int[] src) {<\/p>\n
    return src.clone();<\/p>\n
}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e94\u3001\u6027\u80fd\u8003\u8651<\/h3>\n<\/p>\n
\u5728Java Web\u9879\u76ee\u4e2d\uff0c\u6027\u80fd\u5e38\u5e38\u662f\u9700\u8981\u5173\u6ce8\u7684\u91cd\u70b9\uff0c\u6570\u7ec4\u95f4\u8d4b\u503c\u7684\u6027\u80fd\u8868\u73b0\u53ef\u80fd\u5bf9\u7cfb\u7edf\u7684\u54cd\u5e94\u65f6\u95f4\u6709\u6240\u5f71\u54cd\u3002\u51fa\u4e8e\u6027\u80fd\u8003\u8651\uff0c\u901a\u5e38\u5efa\u8bae\u5927\u578b\u6570\u7ec4\u4f7f\u7528System.arraycopy()<\/code>\u6216Arrays.copyOf()<\/code>\uff0c\u5bf9\u4e8e\u7b80\u5355\u6216\u5c0f\u578b\u7684\u6570\u7ec4\u8d4b\u503c\u64cd\u4f5c\uff0c\u5faa\u73af\u6216\u514b\u9686\u65b9\u6cd5\u4e5f\u8db3\u591f\u9ad8\u6548\u3002<\/p>\n<\/p>\n
\u516d\u3001\u5e94\u7528\u573a\u666f\u5206\u6790<\/h3>\n<\/p>\n
\u5728\u5b9e\u9645\u7684Java Web\u5f00\u53d1\u4e2d\uff0c\u6b63\u786e\u5730\u9009\u62e9\u6570\u7ec4\u8d4b\u503c\u65b9\u5f0f\u5bf9\u7a0b\u5e8f\u7684\u6027\u80fd\u548c\u53ef\u8bfb\u6027\u90fd\u6709\u7740\u91cd\u8981\u5f71\u54cd\u3002\u6bd4\u5982\u5728\u9700\u8981\u5bf9\u6570\u7ec4\u8fdb\u884c\u4fee\u6539\u64cd\u4f5c\u65f6\uff0c\u514b\u9686\u65b9\u6cd5\u53ef\u4ee5\u5f88\u597d\u7684\u4fdd\u8bc1\u539f\u6570\u7ec4\u7684\u6570\u636e\u5b89\u5168\u6027\u3002\u5728\u9700\u8981\u52a8\u6001\u8c03\u6574\u6570\u7ec4\u5927\u5c0f\u65f6\uff0cArrays.copyOf()<\/code>\u65b9\u6cd5\u63d0\u4f9b\u4e86\u66f4\u5927\u7684\u7075\u6d3b\u6027\u3002\u800c\u5728\u6279\u91cf\u5904\u7406\u6570\u636e\u65f6\uff0c\u4f7f\u7528System.arraycopy()<\/code>\u53ef\u4ee5\u8282\u7701\u5b9d\u8d35\u7684\u5904\u7406\u65f6\u95f4\u3002<\/p>\n<\/p>\n
\u901a\u8fc7\u4e0a\u8ff0\u65b9\u6cd5\uff0cJava Web\u9879\u76ee\u4e2d\u7684\u6570\u7ec4\u95f4\u8d4b\u503c\u53ef\u4ee5\u6839\u636e\u5177\u4f53\u9700\u6c42\u8fdb\u884c\u6709\u6548\u7ba1\u7406\uff0c\u786e\u4fdd\u6570\u636e\u64cd\u4f5c\u7684\u9ad8\u6548\u7387\u548c\u7a0b\u5e8f\u7684\u7a33\u5b9a\u6027\u3002\u5f00\u53d1\u8005\u5728\u65bd\u5de5\u65f6\u5e94\u5f53\u6839\u636e\u6570\u7ec4\u5927\u5c0f\u3001\u5b9e\u9645\u9700\u6c42\u548c\u6027\u80fd\u8981\u6c42\u8c28\u614e\u9009\u62e9\u9002\u5408\u7684\u8d4b\u503c\u65b9\u6cd5\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
\u5982\u4f55\u5728Java web \u9879\u76ee\u4e2d\u4e3a\u6570\u7ec4\u4e4b\u95f4\u8d4b\u503c\uff1f<\/strong><\/p>\n
    \n
  1. \u53ef\u4ee5\u4f7f\u7528\u5faa\u73af\u8bed\u53e5\u9010\u4e2a\u8d4b\u503c<\/strong>\u3002\u5728Java web \u9879\u76ee\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528for\u5faa\u73af\u6216\u8005while\u5faa\u73af\u904d\u5386\u6570\u7ec4\uff0c\u5e76\u4e3a\u6bcf\u4e2a\u6570\u7ec4\u5143\u7d20\u8d4b\u503c\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528\u4e0b\u9762\u7684\u4ee3\u7801\u4e3a\u4e00\u4e2a\u6574\u6570\u6570\u7ec4\u8d4b\u503c\uff1a<\/li>\n<\/ol>\n
    int[] arr = new int[5];\nfor (int i = 0; i < arr.length; i++) {\n    arr[i] = i + 1;\n}\n<\/code><\/pre>\n
      \n
    1. \u53ef\u4ee5\u4f7f\u7528\u6570\u7ec4\u8d4b\u503c\u8bed\u53e5\u6765\u521d\u59cb\u5316\u6570\u7ec4<\/strong>\u3002\u5728Java\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u6570\u7ec4\u8d4b\u503c\u8bed\u53e5\u6765\u5feb\u901f\u4e3a\u6570\u7ec4\u8d4b\u521d\u503c\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528\u4e0b\u9762\u7684\u4ee3\u7801\u5c06\u4e00\u4e2a\u6574\u6570\u6570\u7ec4\u8d4b\u503c\u4e3a1\u30012\u30013\u30014\u30015\uff1a<\/li>\n<\/ol>\n
      int[] arr = {1, 2, 3, 4, 5};\n<\/code><\/pre>\n
        \n
      1. \u53ef\u4ee5\u5c06\u4e00\u4e2a\u6570\u7ec4\u7684\u503c\u590d\u5236\u5230\u53e6\u4e00\u4e2a\u6570\u7ec4\u4e2d<\/strong>\u3002\u5728Java\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528System.arraycopy()<\/code>\u65b9\u6cd5\u6216\u8005\u4f7f\u7528\u5faa\u73af\u9010\u4e2a\u590d\u5236\u6570\u7ec4\u5143\u7d20\u6765\u5c06\u4e00\u4e2a\u6570\u7ec4\u7684\u503c\u590d\u5236\u5230\u53e6\u4e00\u4e2a\u6570\u7ec4\u4e2d\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528\u4e0b\u9762\u7684\u4ee3\u7801\u5c06\u4e00\u4e2a\u5b57\u7b26\u4e32\u6570\u7ec4\u7684\u503c\u590d\u5236\u5230\u53e6\u4e00\u4e2a\u5b57\u7b26\u4e32\u6570\u7ec4\u4e2d\uff1a<\/li>\n<\/ol>\n
        String[] sourceArr = {"apple", "banana", "orange"};\nString[] targetArr = new String[sourceArr.length];\nSystem.arraycopy(sourceArr, 0, targetArr, 0, sourceArr.length);\n<\/code><\/pre>\n
        \u4ee5\u4e0a\u662f\u51e0\u79cd\u7ed9\u6570\u7ec4\u95f4\u8d4b\u503c\u7684\u65b9\u6cd5\uff0c\u5728Java web \u9879\u76ee\u4e2d\u53ef\u4ee5\u6839\u636e\u5177\u4f53\u9700\u6c42\u9009\u62e9\u9002\u5408\u7684\u65b9\u6cd5\u8fdb\u884c\u6570\u7ec4\u95f4\u7684\u8d4b\u503c\u64cd\u4f5c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u6570\u7ec4\u95f4\u8d4b\u503c\u5728Java Web\u9879\u76ee\u4e2d\u662f\u4e00\u9879\u57fa\u7840\u4e14\u5e38\u89c1\u7684\u64cd\u4f5c\uff0c\u53ef\u4ee5\u901a\u8fc7\u5faa\u73af\u590d\u5236\u3001System.arraycopy( […]","protected":false},"author":3,"featured_media":271320,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/271309"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=271309"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/271309\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/271320"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=271309"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=271309"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=271309"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}