{"id":89,"date":"2022-12-17T00:40:25","date_gmt":"2023-11-19T13:44:25","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/%e5%a6%82%e4%bd%95%e5%9c%a8java%e4%b8%ad%e4%bd%bf%e7%94%a8%e5%be%aa%e7%8e%af\/"},"modified":"2025-07-31T22:42:30","modified_gmt":"2025-07-31T14:42:30","slug":"%e5%a6%82%e4%bd%95%e5%9c%a8java%e4%b8%ad%e4%bd%bf%e7%94%a8%e5%be%aa%e7%8e%af","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%a6%82%e4%bd%95%e5%9c%a8java%e4%b8%ad%e4%bd%bf%e7%94%a8%e5%be%aa%e7%8e%af\/","title":{"rendered":"Java\u5faa\u73af\u6559\u7a0b\uff1a\u638c\u63e1for\u3001while\u548cdo-while\u5faa\u73af\u7684\u7528\u6cd5\u4e0e\u6280\u5de7"},"content":{"rendered":"

\u5f15\u8a00<\/h3>\n

\u5728\u7f16\u7a0b\u4e2d\uff0c\u7f16\u5199\u91cd\u590d\u6027\u4efb\u52a1\u975e\u5e38\u5e38\u89c1\u3002\u4e00\u79cd\u9009\u62e9\u662f\u6839\u636e\u9700\u8981\u7f16\u5199\u76f8\u540c\u6216\u76f8\u4f3c\u7684\u4ee3\u7801\uff0c\u4ee5\u4fbf\u91cd\u590d\u6267\u884c\u4ee3\u7801\u5757\u3002\u7136\u800c\uff0c\u8fd9\u79cd\u65b9\u6cd5\u8fdc\u975e\u5b8c\u7f8e\uff0c\u56e0\u4e3a\u5b83\u4f1a\u521b\u5efa\u5927\u91cf\u96be\u4ee5\u9605\u8bfb\u548c\u7ef4\u62a4\u7684\u91cd\u590d\u4ee3\u7801\u3002\u4e00\u4e2a\u66f4\u597d\u7684\u9009\u62e9\u662f\u4f7f\u7528\u5faa\u73af\u3002<\/p>\n

\u5faa\u73af\u662f\u63a7\u5236\u91cd\u590d\u7a0b\u5e8f\u6d41\u7a0b\u7684\u7ed3\u6784\u3002\u5178\u578b\u7684\u5faa\u73af\u5305\u542b\u4e24\u4e2a\u90e8\u5206\uff1a\u4e00\u4e2a\u5e03\u5c14\u63a7\u5236\u6761\u4ef6\u548c\u4e00\u4e2a\u4ee3\u7801\u5757\u3002\u5f53\u6761\u4ef6\u4e3a\u771f\u65f6\uff0c\u4ee3\u7801\u5757\u4f1a\u88ab\u6267\u884c\uff0c\u6216\u8005\u76f4\u5230\u6761\u4ef6\u53d8\u4e3a\u5047\u4e3a\u6b62\u3002\u5e03\u5c14\u6761\u4ef6\u4f1a\u5728\u6bcf\u6b21\u8fd0\u884c\u4ee3\u7801\u5757\u65f6\u91cd\u65b0\u8bc4\u4f30\u3002\u9000\u51fa\u5faa\u73af\u7684\u6761\u4ef6\u5bf9\u4e8e\u6bcf\u79cd\u7c7b\u578b\u7684\u5faa\u73af\u662f\u4e0d\u540c\u7684\uff0c\u8fd9\u5c06\u5728\u672c\u6559\u7a0b\u4e2d\u8be6\u7ec6\u5b66\u4e60\u3002<\/p>\n

Java \u4e2d\u4e3b\u8981\u6709\u4e24\u79cd\u5faa\u73af\u7c7b\u578b\uff1awhile<\/code> \u5faa\u73af\u548c for<\/code> \u5faa\u73af\u3002\u5faa\u73af\u7684\u7c7b\u578b\u53d6\u51b3\u4e8e\u5176\u8bed\u6cd5\u548c\u903b\u8f91\u3002while<\/code> \u5faa\u73af\u4f9d\u8d56\u4e8e\u5e03\u5c14\u6761\u4ef6\uff0c\u53ea\u8981\u6761\u4ef6\u4e3a\u771f\uff0c\u4ee3\u7801\u5757\u5c31\u4f1a\u91cd\u590d\u6267\u884c\u3002for<\/code> \u5faa\u73af\u4e5f\u4f1a\u91cd\u590d\u6267\u884c\u4ee3\u7801\u5757\uff0c\u4f46\u5176\u5faa\u73af\u6761\u4ef6\u901a\u5e38\u53d6\u51b3\u4e8e\u6574\u6570\u53d8\u91cf\u7684\u589e\u52a0\u6216\u51cf\u5c11\u3002\u5f53\u8fd9\u4e2a\u53d8\u91cf\u8fbe\u5230\u7279\u5b9a\u7684\u76ee\u6807\u503c\u65f6\uff0c\u5faa\u73af\u5c06\u4f1a\u4e2d\u65ad\u3002<\/p>\n

\u5728\u672c\u6559\u7a0b\u4e2d\uff0c\u60a8\u5c06\u4f7f\u7528 while<\/code> \u5faa\u73af\u548c for<\/code> \u5faa\u73af\u6765\u521b\u5efa\u91cd\u590d\u6027\u4efb\u52a1\uff0c\u5e76\u4e86\u89e3\u6bcf\u79cd\u5faa\u73af\u7684\u4f18\u7f3a\u70b9\u3002<\/p>\n

\u524d\u63d0\u6761\u4ef6<\/h2>\n

\u8981\u6309\u7167\u6b64\u6559\u7a0b\u8fdb\u884c\u64cd\u4f5c\uff0c\u60a8\u9700\u8981\u4ee5\u4e0b\u5185\u5bb9\uff1a<\/p>\n

    \n
  • \u4e00\u4e2a\u53ef\u4ee5\u6267\u884c Java \u7a0b\u5e8f\u7684\u5f00\u53d1\u73af\u5883\uff0c\u4ee5\u4fbf\u8ddf\u968f\u793a\u4f8b\u8fdb\u884c\u64cd\u4f5c\u3002\u8981\u5728\u60a8\u7684\u672c\u5730\u673a\u5668\u4e0a\u8fdb\u884c\u8bbe\u7f6e\uff0c\u60a8\u9700\u8981\uff1a\u5728\u60a8\u7684\u673a\u5668\u4e0a\u5b89\u88c5 Java\uff08\u7248\u672c 11 \u6216\u66f4\u9ad8\uff09\uff0c\u5e76\u5305\u542b Java \u5f00\u53d1\u5de5\u5177\u5305\uff08JDK\uff09\u63d0\u4f9b\u7684\u7f16\u8bd1\u5668\u3002\u5bf9\u4e8e Ubuntu \u548c Debian \u7528\u6237\uff0c\u8bf7\u9075\u5faa\u6211\u4eec\u6559\u7a0b\u300a\u5982\u4f55\u5728 Ubuntu 22.04 \u4e0a\u4f7f\u7528 Apt \u5b89\u88c5 Java\u300b\u4e2d\u9009\u9879 1 \u7684\u6b65\u9aa4\u3002\u5bf9\u4e8e\u5305\u62ec Mac \u548c Windows \u5728\u5185\u7684\u5176\u4ed6\u64cd\u4f5c\u7cfb\u7edf\uff0c\u8bf7\u9075\u5faa Java \u5b89\u88c5\u7684\u4e0b\u8f7d\u9009\u9879\u3002\u4e3a\u4e86\u7f16\u8bd1\u548c\u8fd0\u884c\u4ee3\u7801\u793a\u4f8b\uff0c\u672c\u6559\u7a0b\u4f7f\u7528 Java Shell\uff08\u4e5f\u79f0\u4e3a JShell\uff09\uff0c\u5b83\u662f\u4e00\u4e2a\u4ece\u547d\u4ee4\u884c\u8fd0\u884c\u7684\u8bfb-\u6c42\u503c-\u6253\u5370\u5faa\u73af\uff08REPL\uff09\u3002\u8981\u5f00\u59cb\u4f7f\u7528 JShell\uff0c\u8bf7\u67e5\u9605\u300aJShell \u5165\u95e8\u6307\u5357\u300b\u3002<\/li>\n
  • \u719f\u6089 Java \u548c\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\uff0c\u60a8\u53ef\u4ee5\u5728\u6211\u4eec\u7684\u6559\u7a0b\u300a\u5982\u4f55\u5728 Java \u4e2d\u7f16\u5199\u60a8\u7684\u7b2c\u4e00\u4e2a\u7a0b\u5e8f\u300b\u4e2d\u627e\u5230\u76f8\u5173\u5185\u5bb9\u3002<\/li>\n
  • \u7406\u89e3 Java \u6570\u636e\u7c7b\u578b\uff0c\u8fd9\u5728\u6211\u4eec\u7684\u6559\u7a0b\u300a\u7406\u89e3 Java \u4e2d\u7684\u6570\u636e\u7c7b\u578b\u300b\u4e2d\u6709\u6240\u8ba8\u8bba\u3002<\/li>\n<\/ul>\n

    while<\/code> \u5faa\u73af\u64cd\u4f5c<\/h2>\n

    while<\/code> \u5faa\u73af\u76d1\u63a7\u4e00\u4e2a\u901a\u7528\u7684\u5e03\u5c14\u6761\u4ef6\u8bed\u53e5\u3002\u4f8b\u5982\uff0c\u8fd9\u4e2a\u6761\u4ef6\u8bed\u53e5\u53ef\u4ee5\u9a8c\u8bc1\u4e24\u4e2a\u6574\u6570\u53d8\u91cf\u662f\u5426\u76f8\u7b49\uff0c\u6216\u8005\u4e24\u4e2a\u5bf9\u8c61\u662f\u5426\u76f8\u540c\u3001\u76f8\u5173\u3001\u975e\u7a7a\uff0c\u6216\u8005\u4efb\u4f55\u5176\u4ed6\u53ef\u4ee5\u901a\u8fc7\u7f16\u7a0b\u68c0\u67e5\u7684\u60c5\u51b5\u3002\u5b9e\u9645\u4e0a\uff0c\u53ef\u4ee5\u4f7f\u7528\u4efb\u4f55\u5e03\u5c14\u8bed\u53e5\uff0c\u8fd9\u4e5f\u662f\u4e3a\u4ec0\u4e48 while<\/code> \u5faa\u73af\u5982\u6b64\u5f3a\u5927\u4e14\u5e7f\u6cdb\u4f7f\u7528\u7684\u539f\u56e0\u3002<\/p>\n

    \u5728\u672c\u8282\u4e2d\uff0c\u60a8\u5c06\u4f7f\u7528 while<\/code> \u5173\u952e\u5b57\u5728 Java \u4e2d\u521b\u5efa\u60a8\u7684\u7b2c\u4e00\u4e2a\u7f16\u7a0b\u5faa\u73af\u3002\u60a8\u5c06\u4f7f\u7528\u4e00\u4e2a int<\/code> \u53d8\u91cf\u6765\u63a7\u5236\u5faa\u73af\u3002\u8fd9\u4e2a int<\/code> \u53d8\u91cf\u5c06\u88ab\u547d\u540d\u4e3a x<\/code>\uff0c\u5e76\u5177\u6709\u521d\u59cb\u503c 3\u3002\u53ea\u8981 x<\/code> \u5927\u4e8e 0\uff0c\u5faa\u73af\u5c06\u7ee7\u7eed\u6267\u884c\u4e00\u6bb5\u4ee3\u7801\u5757\u3002\u5728\u8fd9\u4e2a\u4ee3\u7801\u5757\u4e2d\uff0cx<\/code> \u7684\u503c\u5c06\u88ab\u6253\u5370\u51fa\u6765\uff0c\u5e76\u4e14\u6700\u91cd\u8981\u7684\u662f\uff0c\u6bcf\u6b21\u6267\u884c\u540e\u90fd\u4f1a\u8fdb\u884c\u540e\u9012\u51cf\uff08\u4f7f\u7528 --<\/code> \u8fd0\u7b97\u7b26\uff09\u3002\u8fd9\u4e2a\u540e\u9012\u51cf\u64cd\u4f5c\u4f7f\u5f97\u5f53\u524d\u7684\u5faa\u73af\u5728\u51e0\u6b21\u6267\u884c\u540e\u7ed3\u675f\u3002\u5982\u679c\u6ca1\u6709\u8fd9\u4e2a\u64cd\u4f5c\uff0c\u5faa\u73af\u5c06\u4f1a\u65e0\u9650\u7ee7\u7eed\u3002<\/p>\n

    \n

    \u4fe1\u606f\uff1a\u4e3a\u4e86\u8ddf\u968f\u672c\u6559\u7a0b\u4e2d\u7684\u793a\u4f8b\u4ee3\u7801\uff0c\u8bf7\u901a\u8fc7\u8fd0\u884c jshell<\/code> \u547d\u4ee4\u5728\u60a8\u7684\u672c\u5730\u7cfb\u7edf\u4e0a\u6253\u5f00 JShell \u5de5\u5177\u3002\u7136\u540e\uff0c\u60a8\u53ef\u4ee5\u5728 jshell><\/code> \u63d0\u793a\u540e\u7c98\u8d34\u3001\u590d\u5236\u6216\u7f16\u8f91\u793a\u4f8b\uff0c\u5e76\u6309 ENTER<\/code> \u952e\u6267\u884c\u3002\u8981\u9000\u51fa jshell\uff0c\u8bf7\u952e\u5165 \/exit<\/code>\u3002\u4e3a\u4e86\u6d4b\u8bd5\u8fd9\u6bb5\u4ee3\u7801\uff0c\u8bf7\u5c06\u4e0b\u9762\u7684\u884c\u7c98\u8d34\u5230 jshell \u4e2d\u3002<\/p>\n

    <\/code><\/pre>\n
      \n
    1. int x = 3;<\/code><\/li>\n
    2. while<\/code><\/mark> (x > 0) {<\/code><\/li>\n
    3. System.out.println(\"x is \" + x--);<\/code><\/li>\n
    4. }<\/code><\/li>\n<\/ol>\n
      <\/code><\/pre>\n
      <\/code><\/pre>\n
      \u5728\u7b2c\u4e00\u884c\uff0c\u60a8\u5b9a\u4e49\u4e86\u53d8\u91cf x<\/code>\u3002<\/p>\n
      \u5faa\u73af\u4ece\u7b2c2\u884c\u5f00\u59cb\uff0c\u4f7f\u7528 while<\/code> \u5173\u952e\u5b57\u3002\u6761\u4ef6\u8bed\u53e5 (x > 0)<\/code> \u63a7\u5236\u5faa\u73af\u3002\u5b83\u6bd4\u8f83 x<\/code> \u662f\u5426\u5927\u4e8e 0\u3002\u4e4b\u540e\u662f\u5f00\u62ec\u53f7 {<\/code>\uff0c\u8868\u793a\u4ee3\u7801\u5757\u7684\u5f00\u59cb\u3002\u53ea\u8981\u6761\u4ef6\u4e3a\u771f (x > 0)<\/code>\uff0c\u8be5\u4ee3\u7801\u5757\u5c06\u88ab\u91cd\u590d\u6267\u884c\u3002<\/p>\n
      \u4ee3\u7801\u5757\u4e2d\uff0c\u7b2c3\u884c\u7684 System.out.println(\"x is \" + x--);<\/code> \u8bed\u53e5\u4f7f\u7528 println()<\/code> \u65b9\u6cd5\u6253\u5370\u51fa x<\/code> \u7684\u5f53\u524d\u503c\u3002\uff08\u67e5\u770b\u6211\u4eec\u7684\u300a\u5982\u4f55\u5728 Java \u4e2d\u7f16\u5199\u60a8\u7684\u7b2c\u4e00\u4e2a\u7a0b\u5e8f\u300b\u6559\u7a0b\uff0c\u4e86\u89e3\u66f4\u591a\u5173\u4e8e System.out.println<\/code> \u8bed\u53e5\u7684\u5185\u5bb9\u3002\uff09\u5728 println()<\/code> \u7684\u53c2\u6570\u4e2d\uff0c\u4f7f\u7528 x--<\/code> \u4ee3\u7801\u5bf9 x<\/code> \u8fdb\u884c\u540e\u9012\u51cf 1 \u64cd\u4f5c\u3002\u6bcf\u6267\u884c\u4e00\u6b21\uff0cx<\/code> \u51cf\u5c11 1\u3002<\/p>\n
      \u4ee3\u7801\u5757\u5728\u6700\u540e\u4e00\u884c\u4ee5\u53f3\u62ec\u53f7 }<\/code> \u7ed3\u675f\u3002\u8fd9\u4e5f\u662f\u5faa\u73af\u7684\u7ed3\u675f\u5904\u3002<\/p>\n
      \u5f53\u60a8\u5728 jshell \u4e2d\u8fd0\u884c\u6b64\u4ee3\u7801\u65f6\uff0c\u5c06\u4f1a\u6253\u5370\u51fa\u4ee5\u4e0b\u7684\u8f93\u51fa\u3002<\/p>\n
      <\/code><\/pre>\n
      \u8f93\u51fa<\/div>\n
      <\/code><\/pre>\n
      x ==> 3<\/code>
      x is 3<\/code>
      x is 2<\/code>
      x is 1<\/code><\/p>\n
      <\/code><\/pre>\n
      \u7b2c\u4e00\u884c\u786e\u8ba4\u4e86 x<\/code> \u5df2\u7ecf\u6536\u5230\u4e86\u503c\u4e3a 3\u3002\u5728\u63a5\u4e0b\u6765\u7684\u51e0\u884c\u4e2d\uff0cx<\/code> \u7684\u503c\u88ab\u6253\u5370\u4e86\u4e09\u6b21\uff0c\u6bcf\u6b21\u51cf\u5c11 1\u3002\u53ea\u6709\u4e09\u6b21\u8fed\u4ee3\u4e2d\uff0cx<\/code> \u7684\u503c\u5206\u522b\u4e3a 3\u30012 \u548c 1\u3002\u5f53 x<\/code> \u8fbe\u5230 0 \u65f6\uff0c\u5faa\u73af\u7ec8\u6b62\uff0c\u56e0\u4e3a\u6761\u4ef6\u8bed\u53e5 x > 0<\/code> \u4e0d\u518d\u6ee1\u8db3\u3002\u6b64\u65f6\uff0c\u5faa\u73af\u9000\u51fa\uff0c\u5e76\u4e14\u4e0d\u518d\u6253\u5370\u4efb\u4f55\u5185\u5bb9\u3002<\/p>\n
      \u524d\u9762\u7684\u4f8b\u5b50\u662f\u521b\u5efa\u5faa\u73af\u7684\u5e38\u89c1\u65b9\u6cd5\u3002\u5faa\u73af\u7684\u610f\u56fe\u660e\u786e\uff0c\u9000\u51fa\u6761\u4ef6\u4e5f\u5f88\u7b80\u5355\uff1ax > 0<\/code>\u3002\u7406\u8bba\u4e0a\uff0c\u60a8\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u989d\u5916\u7684\u53d8\u91cf\u548c\u6bd4\u8f83\uff08\u5982 x > 0<\/code> \u548c y < 0<\/code>\uff09\u6765\u4f7f\u6761\u4ef6\u66f4\u590d\u6742\uff0c\u4f46\u4ece\u4ee3\u7801\u89c4\u8303\u7684\u89d2\u5ea6\u6765\u770b\uff0c\u8fd9\u4e0d\u88ab\u8ba4\u4e3a\u662f\u6700\u4f73\u5b9e\u8df5\u3002\u590d\u6742\u7684\u6761\u4ef6\u4f7f\u4ee3\u7801\u96be\u4ee5\u8ddf\u8e2a\u548c\u7406\u89e3\uff0c\u5e76\u4e14\u63d0\u4f9b\u7684\u4ef7\u503c\u5fae\u4e4e\u5176\u5fae\uff0c\u5982\u679c\u6709\u7684\u8bdd\u3002<\/p>\n
      do-while<\/code> \u5faa\u73af<\/h2>\n
      do-while<\/code> \u5faa\u73af\u6bd4 while<\/code> \u5faa\u73af\u4e0d\u592a\u6d41\u884c\uff0c\u4f46\u4ecd\u7136\u88ab\u5e7f\u6cdb\u4f7f\u7528\u3002do-while<\/code> \u5faa\u73af\u4e0e while<\/code> \u5faa\u73af\u5f88\u76f8\u4f3c\uff0c\u4f46\u5728\u4e00\u4e2a\u5173\u952e\u65b9\u9762\u6709\u6240\u4e0d\u540c\uff1a\u4ee3\u7801\u5757\u5148\u6267\u884c\uff0c\u7136\u540e\u518d\u8bc4\u4f30\u5faa\u73af\u6761\u4ef6\u3002<\/p>\n
      \u4f5c\u4e3a\u63d0\u9192\uff0c\u5f53\u5faa\u73af\u6761\u4ef6\u4e0d\u6ee1\u8db3\u65f6\uff0cwhile<\/code> \u5faa\u73af\u9996\u5148\u8bc4\u4f30\u6761\u4ef6\uff0c\u53ef\u80fd\u6c38\u8fdc\u4e0d\u4f1a\u6267\u884c\u4ee3\u7801\u5757\u3002\u7136\u800c\uff0c\u5728 do-while<\/code> \u5faa\u73af\u4e2d\uff0c\u4ee3\u7801\u5757\u81f3\u5c11\u6267\u884c\u4e00\u6b21\uff0c\u7136\u540e\u518d\u8bc4\u4f30\u5faa\u73af\u63a7\u5236\u6761\u4ef6\u3002\u5982\u679c\u6761\u4ef6\u4e3a\u771f\uff0c\u5faa\u73af\u5c06\u7ee7\u7eed\u8fdb\u884c\u989d\u5916\u7684\u8fed\u4ee3\uff0c\u76f4\u5230\u6761\u4ef6\u4e0d\u518d\u4e3a\u771f\u3002\u56e0\u6b64\uff0c\u5728\u9700\u8981\u8be2\u95ee\u95ee\u9898\u5e76\u4ec5\u5728\u5f97\u5230\u6b63\u786e\u7b54\u6848\u65f6\u624d\u7ec8\u6b62\u5faa\u73af\u7684\u573a\u666f\u4e2d\uff0cdo-while<\/code> \u5faa\u73af\u975e\u5e38\u6709\u7528\u3002<\/p>\n
      \u5728\u672c\u8282\u4e2d\uff0c\u60a8\u5c06\u521b\u5efa\u4e00\u4e2a\u4e0e\u524d\u4e00\u8282\u4e2d\u7684 while<\/code> \u5faa\u73af\u7c7b\u4f3c\u7684 do-while<\/code> \u5faa\u73af\u3002\u6574\u6570\u53d8\u91cf\u5c06\u88ab\u79f0\u4e3a x<\/code>\uff0c\u5e76\u4e14\u521d\u59cb\u503c\u4e3a 3\u3002\u7136\u800c\uff0c\u8fd9\u4e00\u6b21\u6761\u4ef6\u88ab\u98a0\u5012\uff08x < 0<\/code>\uff09\uff0c\u5e76\u4e14\u4ee3\u7801\u5757\u5c06\u5728\u8bc4\u4f30\u6761\u4ef6\u4e4b\u524d\u6267\u884c\u3002<\/p>\n
      \u5728\u7ec8\u7aef\u6253\u5f00 jshell \u5e76\u6dfb\u52a0 do-while<\/code> \u5faa\u73af\u3002<\/p>\n
      <\/code><\/pre>\n
        \n
      1. int x = 3;<\/code><\/li>\n
      2. do<\/code><\/mark> {<\/code><\/li>\n
      3. System.out.println(\"x is \" + x--);<\/code><\/li>\n
      4. }<\/code> while<\/code><\/mark> (x < 0);<\/code><\/li>\n<\/ol>\n
        <\/code><\/pre>\n
        <\/code><\/pre>\n
        \u4ee3\u7801\u4e0e\u524d\u4e00\u8282\u4e2d\u7684 while<\/code> \u5faa\u73af\u6709\u4e00\u4e9b\u76f8\u4f3c\u4e4b\u5904\u3002\u9996\u5148\uff0c\u53d8\u91cf x<\/code> \u518d\u6b21\u88ab\u8d4b\u503c\u4e3a 3\u3002<\/p>\n
        \u5728\u7b2c2\u884c\uff0c\u5faa\u73af\u4ee5\u5173\u952e\u5b57 do<\/code> \u548c\u4ee3\u7801\u5757\u7684\u5f00\u62ec\u53f7 {<\/code> \u5f00\u59cb\u3002\u5728\u7b2c3\u884c\uff0c\u4f7f\u7528 println()<\/code> \u65b9\u6cd5\u6253\u5370 x<\/code> \u7684\u503c\u3002\u4f7f\u7528 println()<\/code> \u65b9\u6cd5\u65f6\uff0c\u8fd8\u4f7f\u7528\u540e\u51cf\u64cd\u4f5c\u7b26 --<\/code> \u6765\u9012\u51cf x<\/code> \u7684\u503c\u3002<\/p>\n
        \u5728\u4ee3\u7801\u5757\u7684\u6700\u540e\u4e00\u884c\u662f\u95ed\u5408\u62ec\u53f7 }<\/code>\uff0c\u4e4b\u540e\u662f\u5e26\u6709\u6761\u4ef6\u8bed\u53e5 (x < 0)<\/code> \u7684 while<\/code> \u5173\u952e\u5b57\u3002\u8fd9\u662f\u4e0e\u4e4b\u524d\u7684 while<\/code> \u5faa\u73af\u4e0d\u540c\u7684\u5730\u65b9\u3002\u5728\u8fd9\u91cc\uff0c\u6761\u4ef6\u88ab\u98a0\u5012\u4e86\uff1ax<\/code> \u5e94\u8be5\u5c0f\u4e8e 0\u3002\u5728\u4e4b\u524d\u7684\u4f8b\u5b50\u4e2d\uff0c\u6761\u4ef6\u8981\u6c42 x<\/code> \u5927\u4e8e 0\u3002\u8fd9\u4e2a\u53d8\u5316\u8868\u660e\u5373\u4f7f\u6761\u4ef6\u6c38\u8fdc\u4e0d\u6ee1\u8db3\uff0c\u4ee3\u7801\u5757\u4e5f\u4f1a\u8fd0\u884c\u4e00\u6b21\u3002<\/p>\n
        \u5f53\u60a8\u5728 jshell \u4e2d\u8fd0\u884c\u8fd9\u6bb5\u4ee3\u7801\u65f6\uff0c\u5c06\u4f1a\u6253\u5370\u51fa\u4ee5\u4e0b\u8f93\u51fa\u3002<\/p>\n
        <\/code><\/pre>\n
        \u8f93\u51fa<\/div>\n
        <\/code><\/pre>\n
        x ==> 3<\/code>
        x is 3<\/code><\/p>\n
        <\/code><\/pre>\n
        \u7b2c\u4e00\u884c\u786e\u8ba4\u4e86 x<\/code> \u7684\u503c\u662f 3\u3002\u7b2c\u4e8c\u884c\u6253\u5370 x<\/code> \u662f 3\u3002\u8fd9\u662f do-while<\/code> \u5faa\u73af\u7684\u7279\u70b9\uff1a\u5373\u4f7f\u6761\u4ef6 (x < 0)<\/code> \u4e0d\u6ee1\u8db3\uff0c\u4ee3\u7801\u5757\u4ecd\u7136\u4f1a\u6267\u884c\u81f3\u5c11\u4e00\u6b21\u3002\u8fd9\u79cd\u65e0\u6761\u4ef6\u6267\u884c\u53ef\u80fd\u5e76\u4e0d\u603b\u662f\u9700\u8981\u7684\uff0c\u6240\u4ee5\u5728\u4f7f\u7528 do-while<\/code> \u5faa\u73af\u65f6\u9700\u8981\u8c28\u614e\u3002\u7531\u4e8e\u8fd9\u4e2a\u6ce8\u610f\u4e8b\u9879\uff0cdo-while<\/code> \u5faa\u73af\u5e76\u4e0d\u7ecf\u5e38\u4f7f\u7528\u3002<\/p>\n
        for<\/code> \u5faa\u73af<\/h2>\n
        \u8fd9\u662f\u6587\u7ae0\u300a\u5982\u4f55\u5728Java\u4e2d\u4f7f\u7528\u5faa\u73af\u300b\u7684\u7b2c2\u90e8\u5206\uff08\u51713\u90e8\u5206\uff09\u3002<\/p>\n
        \u53e6\u4e00\u79cd\u5faa\u73af\u7ed3\u6784\u662f for<\/code> \u5faa\u73af\u3002\u5b83\u4e5f\u7528\u4e8e\u6839\u636e\u6761\u4ef6\u91cd\u590d\u8fd0\u884c\u4e00\u6bb5\u4ee3\u7801\uff0c\u4f46\u6bd4 while<\/code> \u5faa\u73af\u6709\u66f4\u591a\u7684\u9009\u9879\u3002\u5728\u5faa\u73af\u63a7\u5236\u6761\u4ef6\u4e2d\uff0c\u4f60\u53ef\u4ee5\u6dfb\u52a0\u4e34\u65f6\u53d8\u91cf\uff0c\u5b9a\u4e49\u63a7\u5236\u6761\u4ef6\uff0c\u5e76\u6539\u53d8\u4e34\u65f6\u53d8\u91cf\u7684\u503c\u3002\u8fd9\u6837\uff0c\u4f60\u5c06\u6240\u6709\u63a7\u5236\u5faa\u73af\u7684\u56e0\u7d20\u7ed1\u5b9a\u5728\u4e00\u8d77\uff0c\u51cf\u5c11\u4e86\u6f0f\u6389\u67d0\u4e9b\u4e1c\u897f\u6216\u72af\u9519\u8bef\u7684\u53ef\u80fd\u6027\u3002\u8fd9\u4f7f\u4f60\u7684\u4ee3\u7801\u66f4\u6613\u4e8e\u7406\u89e3\u548c\u6574\u6d01\u3002\u5f53\u4f60\u60f3\u5728\u4ee3\u7801\u4e2d\u9075\u5faa\u66f4\u4e25\u683c\u7684\u98ce\u683c\u65f6\uff0cfor<\/code> \u5faa\u73af\u66f4\u9002\u5408\u4f7f\u7528\u3002<\/p>\n
        \u8fd9\u662f\u4e00\u4e2a\u5178\u578b\u7684 for<\/code> \u5faa\u73af\uff1a<\/p>\n
        <\/code><\/pre>\n
          \n
        1. for<\/span><\/mark> (<\/span>int x =<\/span> 3<\/span>;<\/span> x ><\/span> 0<\/span>;<\/span> x–)<\/span> {<\/span><\/li>\n
        2. System.out.println(<\/span>“x is “<\/span> + x)<\/span>;<\/span><\/li>\n
        3. }<\/span><\/li>\n<\/ol>\n
          <\/code><\/pre>\n
           <\/p>\n
          <\/code><\/pre>\n
          \u5faa\u73af\u4ee5\u7b2c\u4e00\u884c\u7684 for<\/code> \u5173\u952e\u5b57\u5f00\u59cb\u3002\u62ec\u53f7\u5185\u7684\u6761\u4ef6\u8bed\u53e5\u7531\u4e09\u4e2a\u90e8\u5206\u7ec4\u6210\u3002<\/p>\n
            \n
          • int x = 3<\/code> \u5b9a\u4e49\u4e86\u4e00\u4e2a\u53d8\u91cf (x)\u3002\u5728\u8fd9\u91cc\u5b9a\u4e49\u4e00\u4e2a\u4e34\u65f6\u53d8\u91cf\u5f88\u65b9\u4fbf\uff0c\u56e0\u4e3a\u5b83\u4eec\u53ea\u5728\u5faa\u73af\u4e2d\u9700\u8981\uff0c\u6240\u4ee5\u5c06\u5b83\u4eec\u96c6\u6210\u5230\u5faa\u73af\u4e2d\u662f\u6709\u610f\u4e49\u7684\u3002\u76f8\u6bd4\u4e4b\u4e0b\uff0c\u5f53\u4f60\u4f7f\u7528 while<\/code> \u5faa\u73af\u65f6\uff0c\u4f60\u5fc5\u987b\u5728\u5faa\u73af\u4e4b\u524d\u5355\u72ec\u58f0\u660e\u53d8\u91cf\u3002<\/li>\n
          • x > 0<\/code> \u662f\u4ee3\u7801\u5757\u6267\u884c\u5fc5\u987b\u6ee1\u8db3\u7684\u6761\u4ef6\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0cx \u5fc5\u987b\u5927\u4e8e 0\u3002\u8fd9\u90e8\u5206\u7c7b\u4f3c\u4e8e while<\/code> \u5faa\u73af\u63a7\u5236\u8bed\u53e5\uff0c\u540e\u8005\u53ea\u5305\u542b\u8981\u8bc4\u4f30\u7684\u6761\u4ef6\u3002<\/li>\n
          • x--<\/code> \u662f\u6bcf\u6b21\u6210\u529f\u8fed\u4ee3\u65f6\u6267\u884c\u7684\u64cd\u4f5c\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u540e\u7f6e\u9012\u51cf\u64cd\u4f5c\u5728\u6bcf\u6b21\u6210\u529f\u6267\u884c\u540e\u51cf\u5c11 x \u7684\u503c\u3002<\/li>\n<\/ul>\n
            \u7b2c2\u884c\u7684 System.out.println(\"x is \" + x);<\/code> \u8bed\u53e5\u4f7f\u7528 println()<\/code> \u65b9\u6cd5\u6253\u5370\u51fa x \u7684\u503c\u3002\u5b83\u63a5\u6536\u5230\u7684\u662f x \u7684\u539f\u59cb\u503c\u3002\u76f8\u6bd4\u4e4b\u4e0b\uff0c\u5728 while<\/code> \u5faa\u73af\u4e2d\u4f60\u4f7f\u7528\u4e86 println()<\/code> \u65b9\u6cd5\u6765\u64cd\u4f5c x \u7684\u503c\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\u662f\u4e0d\u5fc5\u8981\u7684\uff0c\u56e0\u4e3a\u540e\u7f00\u9012\u51cf\u64cd\u4f5c\u5df2\u7ecf\u5728\u6761\u4ef6\u8bed\u53e5\u7684\u7b2c\u4e09\u90e8\u5206\u4e2d\u5904\u7406\u4e86\uff1ax--<\/code>\u3002<\/p>\n
            \u7b2c\u4e09\u884c\u7528\u95ed\u5408\u62ec\u53f7 }<\/code> \u7ed3\u675f\u4e86\u4ee3\u7801\u5757\u548c\u6574\u4e2a\u5faa\u73af\u7ed3\u6784\u3002<\/p>\n
            \u5f53\u4f60\u5728 jshell \u4e2d\u8fd0\u884c\u6b64\u4ee3\u7801\u65f6\uff0c\u4f1a\u6253\u5370\u51fa\u4ee5\u4e0b\u8f93\u51fa\uff1a<\/p>\n
            <\/code><\/pre>\n
            \u8f93\u51fa<\/div>\n
            x is 3\r\nx is 2\r\nx is 1<\/code><\/pre>\n
            \u8f93\u51fa\u786e\u8ba4\u4ee3\u7801\u5757\u5df2\u6267\u884c\u4e09\u6b21\u3002\u7b2c\u4e00\u6b21\uff0cx \u7684\u503c\u4e3a3\u3002\u7b2c\u4e8c\u6b21\uff0cx \u4e3a2\uff0c\u7b2c\u4e09\u6b21\uff0cx \u4e3a1\u3002\u7b2c\u4e09\u6b21\u540e\uff0cx \u53d8\u4e3a0\uff0c\u5faa\u73af\u9000\u51fa\uff0c\u800c\u4ee3\u7801\u5757\uff08\u6253\u5370 x \u7684\u503c\uff09\u672a\u88ab\u6267\u884c\u3002<\/p>\n
            \u8fd9\u4e2a for<\/code> \u5faa\u73af\u8fbe\u5230\u4e86\u4e0e while<\/code> \u5faa\u73af\u76f8\u540c\u7684\u7ed3\u679c\u3002\u4ece\u6027\u80fd\u548c\u8d44\u6e90\u4f7f\u7528\u7684\u89d2\u5ea6\u6765\u770b\uff0c\u5e94\u8be5\u6ca1\u6709\u4ec0\u4e48\u5dee\u5f02\uff0c\u6240\u4ee5\u66f4\u591a\u662f\u4e2a\u4eba\u504f\u597d\u6765\u9009\u62e9\u4f7f\u7528\u54ea\u79cd\u5faa\u73af\u3002\u7136\u800c\uff0c\u5982\u679c\u8fed\u4ee3\u6b21\u6570\u662f\u5df2\u77e5\u7684\uff0c\u901a\u5e38\u63a8\u8350\u4f7f\u7528 for<\/code> \u5faa\u73af\uff0c\u56e0\u4e3a\u5b83\u53ef\u4ee5\u4f7f\u4f60\u66f4\u6e05\u6670\u5730\u8ddf\u8e2a\u4ee3\u7801\u3002<\/p>\n
            for-each<\/code> \u5faa\u73af<\/h2>\n
            for-each<\/code> \u5faa\u73af\u4e0e\u5176\u4ed6\u5faa\u73af\u76f8\u4f3c\uff0c\u4f46\u5176\u4f18\u70b9\u5728\u4e8e\u4e13\u95e8\u4e3a\u5c3d\u53ef\u80fd\u5c11\u7684\u4ee3\u7801\u904d\u5386\u4e00\u7ec4\u6570\u503c\u800c\u8bbe\u8ba1\u3002\u53ea\u8981\u4f60\u6709\u4e00\u7ec4\u6570\u503c\uff0c\u5c31\u65e0\u9700\u8ddf\u8e2a\u5b83\u4eec\u7684\u6570\u91cf\u6216\u8ddf\u968f\u8fed\u4ee3\u8fc7\u7a0b\uff0c\u5c31\u53ef\u4ee5\u904d\u5386\u5b83\u4eec\u3002for-each<\/code> \u5faa\u73af\u4f1a\u786e\u4fdd\u5982\u679c\u7ec4\u4e2d\u5b58\u5728\u6570\u503c\uff0c\u5b83\u4eec\u5c06\u88ab\u9010\u4e2a\u63d0\u53d6\u5e76\u5448\u73b0\u7ed9\u4f60\u3002<\/p>\n
            \u5927\u591a\u6570\u7f16\u7a0b\u8bed\u8a00\u90fd\u6709\u4e00\u4e2a\u65b9\u4fbf\u7684\u5feb\u6377\u65b9\u5f0f\u7528\u4e8e for-each<\/code> \u5faa\u73af\u3002\u5728 Java \u4e2d\uff0c\u6ca1\u6709\u4e13\u95e8\u7684 for-each<\/code> \u5173\u952e\u5b57\uff0c\u800c\u662f\u4f7f\u7528 for<\/code> \u5173\u952e\u5b57\u3002\u7136\u800c\uff0cfor-each<\/code> \u6761\u4ef6\u8bed\u53e5\u4e0e\u5e38\u89c1\u7684 for<\/code> \u5faa\u73af\u4e0d\u540c\uff0c\u4f60\u5c06\u5728\u4e0b\u9762\u53d1\u73b0\u3002<\/p>\n
            \u8981\u4f7f\u7528 for-each<\/code> \u5faa\u73af\uff0c\u4f60\u9700\u8981\u4f7f\u7528\u4e00\u7ec4\u503c\uff0c\u5e76\u4e14\u6570\u7ec4\u975e\u5e38\u9002\u5408\u8fd9\u4e2a\u76ee\u7684\u3002\u6570\u7ec4\u662f\u4e00\u4e2a\u5305\u542b\u76f8\u540c\u7c7b\u578b\u503c\u7684\u5bf9\u8c61\u3002\u5728\u63a5\u4e0b\u6765\u7684\u793a\u4f8b\u4e2d\uff0c\u4f60\u5c06\u4f7f\u7528\u5305\u542b int<\/code> \u503c\u7684\u6570\u7ec4\u3002<\/p>\n
            \u5c06\u4ee5\u4e0b\u4ee3\u7801\u6dfb\u52a0\u5230 jshell \u4e2d\u7528\u4e8e for-each<\/code> \u5faa\u73af\uff1a<\/p>\n
            <\/code><\/pre>\n
              \n
            1. int[] numbers = {0, 1, 2};<\/li>\n
            2. for<\/mark> (int x:<\/mark> numbers) {<\/li>\n
            3. System.out.println(x);<\/li>\n
            4. }<\/li>\n<\/ol>\n
              <\/code><\/pre>\n
               <\/p>\n
              <\/code><\/pre>\n
              \u7b2c\u4e00\u884c\uff0c\u4f60\u521b\u5efa\u4e86\u4e00\u4e2a\u6574\u6570\u6570\u7ec4\uff0c\u5305\u542b\u4e09\u4e2a\u6574\u6570\uff080\u30011\u548c2\uff09\u3002<\/p>\n
              for-each<\/code> \u5faa\u73af\u4ece\u7b2c2\u884c\u7684 for<\/code> \u5173\u952e\u5b57\u5f00\u59cb\u3002\u7136\u540e\uff0c\u60a8\u5b9a\u4e49\u4e00\u4e2a\u4e34\u65f6\u53d8\u91cf int x<\/code>\uff0c\u63a5\u7740\u662f\u4e00\u4e2a\u5192\u53f7\u3002\u5192\u53f7\u7528\u4f5c for-each<\/code> \u64cd\u4f5c\u7684\u5feb\u6377\u65b9\u5f0f\u3002\uff08for-each<\/code> \u5faa\u73af\u8bed\u53e5\u662f\u72ec\u7279\u7684\uff0c\u56e0\u4e3a\u8fd9\u662f Java \u4e2d\u552f\u4e00\u4f7f\u7528\u5192\u53f7\u7684\u5730\u65b9\u3002\uff09\u5192\u53f7\u540e\u9762\u662f\u4e00\u7ec4\u503c\uff0c\u4f8b\u5982\u4e00\u4e2a\u6570\u7ec4\u3002<\/p>\n
              \u5728 for-each<\/code> \u5faa\u73af\u8bed\u53e5\u4e4b\u540e\u662f\u4ee3\u7801\u5757\uff0c\u5728\u8fd9\u91cc\u5c06\u4e3a numbers<\/code> \u6570\u7ec4\u7684\u6bcf\u4e2a\u503c\u6267\u884c\u8be5\u4ee3\u7801\u5757\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0cSystem.out.println(x)<\/code> \u8bed\u53e5\u5c06\u4f7f\u7528 println()<\/code> \u65b9\u6cd5\u6253\u5370 x \u7684\u503c\uff0c\u8be5\u65b9\u6cd5\u5c06\u5f15\u7528 numbers<\/code> \u6570\u7ec4\u7684\u6bcf\u4e2a\u503c\u3002<\/p>\n
              \u5f53\u60a8\u5728 jshell \u4e2d\u8fd0\u884c\u4e0a\u8ff0\u4ee3\u7801\u65f6\uff0c\u5c06\u6253\u5370\u4ee5\u4e0b\u8f93\u51fa\u3002<\/p>\n
              <\/code><\/pre>\n
              \u8f93\u51fa<\/div>\n
              numbers ==> int[3] { 0, 1, 2 }\r\n0\r\n1\r\n2<\/code><\/pre>\n
              \u7b2c\u4e00\u884c\u786e\u8ba4\u4e86\u4e00\u4e2a\u540d\u4e3a numbers<\/code> \u7684\u6570\u7ec4\u5df2\u7ecf\u5b9a\u4e49\uff0c\u5176\u4e2d\u5305\u542b\u4e86\u6570\u503c0\u30011\u548c2\u3002\u4ee5\u4e0b\u7684\u884c\u6253\u5370\u51fa\u6570\u7ec4\u7684\u503c\uff0c\u6bcf\u4e2a\u503c\u5360\u636e\u4e00\u884c\uff1a0\u30011\u548c2\u3002<\/p>\n
              \u5c3d\u7ba1\u4f7f\u7528\u5176\u4ed6\u5faa\u73af\u4e3b\u8981\u662f\u4e2a\u4eba\u9009\u62e9\u7684\u95ee\u9898\uff0c\u4f46 for-each<\/code> \u5faa\u73af\u662f\u5728\u4e00\u7ec4\u503c\u4e0a\u8fed\u4ee3\u7684\u4e8b\u5b9e\u6807\u51c6\u3002\u53ef\u4ee5\u4f7f\u7528 for<\/code> \u6216 while<\/code> \u5faa\u73af\u521b\u5efa\u81ea\u5df1\u7684\u66ff\u4ee3 for-each<\/code> \u5faa\u73af\uff0c\u4f46\u8fd9\u5e76\u4e0d\u503c\u5f97\u4ed8\u51fa\u5f88\u5927\u52aa\u529b\uff0c\u5e76\u4e14\u9700\u8981\u5bf9\u6570\u636e\u7ed3\u6784\u6709\u6df1\u5165\u7684\u7406\u89e3\u3002<\/p>\n
              \u65e0\u9650\u5faa\u73af<\/h2>\n
              \u65e0\u9650\u5faa\u73af\u662f\u6307\u90a3\u4e9b\u6c38\u8fdc\u4e0d\u4f1a\u7ec8\u6b62\u7684 for<\/code> \u5faa\u73af\u6216 while<\/code> \u5faa\u73af\u3002\u5f53\u63a7\u5236\u6761\u4ef6\u59cb\u7ec8\u4e3a\u771f\u65f6\uff0c\u5b83\u4eec\u53d8\u6210\u65e0\u9650\u5faa\u73af\u3002<\/p>\n
              \u8fd9\u662f\u4e00\u4e2a\u5e38\u89c1\u7684\u65e0\u9650\u5faa\u73af\u7684\u793a\u4f8b\uff1a<\/p>\n
              <\/code><\/pre>\n
                \n
              1. while<\/span> (<\/span>true)<\/span> {<\/span><\/li>\n
              2. System.out.println(<\/span>“This will print forever.”<\/span>)<\/span>;<\/span><\/li>\n
              3. }<\/span><\/li>\n<\/ol>\n
                <\/code><\/pre>\n
                 <\/p>\n
                <\/code><\/pre>\n
                \u7b2c\u4e00\u884c\u770b\u8d77\u6765\u50cf\u662f\u4e00\u4e2a\u5178\u578b\u7684 while<\/code> \u5faa\u73af\uff0c\u4f46\u662f\u4e0d\u540c\u4e8e x > 0<\/code> \u8fd9\u6837\u7684\u6761\u4ef6\uff0c\u5b83\u53ea\u6709 true<\/code> \u8fd9\u4e2a\u503c\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u5f53\u9700\u8981\u8bc4\u4f30\u63a7\u5236\u6761\u4ef6\u65f6\uff0c\u603b\u662f\u76f4\u63a5\u8fd4\u56de true<\/code>\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u5faa\u73af\u6ca1\u6709\u9000\u51fa\u6761\u4ef6\uff0c\u6240\u4ee5\u5b83\u4f1a\u6c38\u8fdc\u7ee7\u7eed\u6267\u884c\u3002\u7b2c\u4e8c\u884c\u5305\u542b\u4e86 System.out.println(\"This will print forever.\");<\/code> \u8bed\u53e5\uff1b\u5b83\u4f1a\u4f7f\u7528 println()<\/code> \u65b9\u6cd5\u6253\u5370\u6587\u672c\u201cThis will print forever\u201d\u3002<\/p>\n
                \u5f53\u4f60\u5728 jshell \u4e2d\u8fd0\u884c\u4e0a\u8ff0\u4ee3\u7801\u65f6\uff0c\u4e0b\u9762\u7684\u8f93\u51fa\u5c06\u4f1a\u6253\u5370\uff0c\u76f4\u5230\u4f60\u7ec8\u6b62\u4ee3\u7801\u3002\u51c6\u5907\u4f7f\u7528\u952e\u76d8\u7ec4\u5408 CTRL+C<\/code> \u5feb\u901f\u7ec8\u6b62\u5b83\uff0c\u6216\u8005\u76f4\u63a5\u5173\u95ed\u7ec8\u7aef\u3002\u5426\u5219\uff0c\u5b83\u5c06\u65e0\u4f11\u6b62\u5730\u7ee7\u7eed\u8fd0\u884c\u3002<\/p>\n
                <\/code><\/pre>\n
                \u8f93\u51fa<\/div>\n
                \u53ea\u663e\u793a\u524d\u4e24\u6b21\u91cd\u590d\uff0c\u4f46\u8fd9\u4e2a\u8f93\u51fa\u5c06\u4f1a\u4e00\u76f4\u7ee7\u7eed\uff0c\u76f4\u5230\u4f60\u6309\u4e0bCTRL+C\u624b\u52a8\u7ec8\u6b62\u5b83\u3002<\/p>\n
                \u901a\u8fc7\u65e0\u9650\u5faa\u73af\u7684\u793a\u4f8b\uff0c\u53ef\u4ee5\u660e\u663e\u770b\u51fa\u5728\u5e03\u5c14\u8bed\u53e5\u4e2d\u653e\u7f6e\u4e00\u4e2a\u771f\u503c\u662f\u6709\u610f\u521b\u9020\u8fd9\u6837\u4e00\u4e2a\u5faa\u73af\u7684\u3002\u8fd9\u79cd\u5faa\u73af\u5728\u8fc7\u53bb\u5f88\u53d7\u6b22\u8fce\uff0c\u53ef\u80fd\u4f1a\u5728\u9057\u7559\u9879\u76ee\u4e2d\u5b58\u5728\u3002\u60a8\u4ecd\u7136\u53ef\u4ee5\u521b\u5efa\u8fd9\u6837\u7684\u65e0\u9650\u5faa\u73af\uff0c\u4f46\u662f\u6709\u66f4\u597d\u7684\u65b9\u6cd5\u6765\u521b\u5efa\u6301\u7eed\u8fd0\u884c\u7684\u4efb\u52a1\uff0c\u4f8b\u5982\u4f7f\u7528\u5b9a\u65f6\u5668\u4efb\u52a1\u3002\u5b9a\u65f6\u5668\u4efb\u52a1\u66f4\u52a0\u9ad8\u7ea7\u5e76\u63d0\u4f9b\u66f4\u591a\u9009\u9879\uff0c\u56e0\u6b64\u66f4\u53d7\u63a8\u8350\u3002<\/p>\n
                \u5f88\u4e0d\u5e78\uff0c\u6709\u65f6\u65e0\u9650\u5faa\u73af\u5e76\u975e\u6545\u610f\u7684\u3002\u4f60\u53ef\u80fd\u4f1a\u72af\u9519\uff0c\u5bfc\u81f4\u65e0\u9650\u5faa\u73af\u3002\u8bf7\u8003\u8651\u4ee5\u4e0b\u4ee3\u7801\uff1a<\/p>\n
                  \r\n \t
                1. int x = 3;<\/li>\r\n \t
                2. while<\/mark> (x > 0) {<\/li>\r\n \t
                3. System.out.println(\"x is \" + x);<\/li>\r\n \t
                4. }<\/li>\r\n<\/ol><\/code><\/pre>\n
                  \u4e0a\u9762\u7684\u4ee3\u7801\u548c\u6559\u7a0b\u4e2d\u7684\u7b2c\u4e00\u4e2a\u793a\u4f8b\u975e\u5e38\u76f8\u4f3c\u3002\u5728\u7b2c\u4e00\u884c\uff0c\u4f60\u5b9a\u4e49\u4e86\u4e00\u4e2a\u53d8\u91cfx\uff0c\u5176\u503c\u4e3a3\u3002<\/p>\n
                  \u5728\u7b2c2\u884c\u4e2d\u51fa\u73b0\u4e86while<\/code>\u5173\u952e\u5b57\u548c\u63a7\u5236\u6761\u4ef6\uff0c\u5b83\u8868\u793a\u5faa\u73af\u5e94\u8be5\u5728x > 0<\/code>\u4e3a\u771f\u65f6\u7ee7\u7eed\u3002<\/p>\n
                  \u7b2c3\u884c\u7684System.out.println(\"x is \" + x);<\/code>\u8bed\u53e5\u4f7f\u7528println()<\/code>\u65b9\u6cd5\u6253\u5370x\u7684\u503c\u3002\u7136\u800c\uff0c\u4e0e\u672c\u6559\u7a0b\u7b2c\u4e00\u90e8\u5206\u4e2d\u7684while<\/code>\u5faa\u73af\u793a\u4f8b\u76f8\u6bd4\uff0c\u8be5\u5faa\u73af\u6ca1\u6709\u5728\u4e09\u6b21\u8fd0\u884c\u540e\u7ed3\u675f\uff0c\u5f53\u524d\u793a\u4f8b\u4e2d\u4e5f\u6ca1\u6709\u540e\u7f00\u9012\u51cf\u64cd\u4f5c\u3002\u56e0\u6b64\uff0c\u5f53\u60a8\u5728jshell\u4e2d\u8fd0\u884c\u6b64\u5faa\u73af\u65f6\uff0c\u60a8\u5c06\u4f1a\u5f97\u5230\u4ee5\u4e0b\u8fde\u7eed\u7684\u8f93\u51fa\u3002<\/p>\n
                  Output<\/div>\n
                  x is 3\r\nx is 3\r\n...\r\n<\/code><\/pre>\n
                  \u9664\u975e\u4f60\u4f7f\u7528CTRL+C\u7ec8\u6b62\u5faa\u73af\uff0c\u5426\u5219\u8fd9\u4e9b\u4ee3\u7801\u884c\u5c06\u65e0\u4f11\u6b62\u5730\u91cd\u590d\u6267\u884c\u3002\u8fd9\u79cd\u610f\u5916\u7684\u65e0\u9650\u5faa\u73af\u5f88\u5371\u9669\uff0c\u56e0\u4e3a\u53ef\u80fd\u5bfc\u81f4\u7a0b\u5e8f\u5d29\u6e83\u6216\u8d85\u8f7d\u8fd0\u884c\u7a0b\u5e8f\u7684\u673a\u5668\u3002\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u5728\u521b\u5efa\u5faa\u73af\u65f6\u5e94\u8be5\u5c0f\u5fc3\uff0c\u5e76\u786e\u4fdd\u5b58\u5728\u53ef\u884c\u7684\u7ec8\u6b62\u6761\u4ef6\u8def\u5f84\u3002\u5728\u5f53\u524d\u7684\u4f8b\u5b50\u4e2d\uff0c\u4f60\u5e94\u8be5\u786e\u4fdd\u6bcf\u6b21\u5faa\u73af\u90fd\u51cf\u5c11x\u7684\u503c\uff0c\u4ee5\u6ee1\u8db3\u5faa\u73af\u9000\u51fa\u6761\u4ef6x > 0<\/code>\u3002<\/p>\n
                  \u7ed3\u8bba<\/h2>\n
                  \u5728\u672c\u6559\u7a0b\u4e2d\uff0c\u4f60\u4f7f\u7528\u5faa\u73af\u7ed3\u6784\u6765\u521b\u5efa\u91cd\u590d\u4efb\u52a1\u3002\u4f60\u5b66\u4f1a\u4e86\u5728\u4f55\u65f6\u9002\u5408\u4f7f\u7528while<\/code>\u548cfor<\/code>\u5faa\u73af\uff0c\u5e76\u64b0\u5199\u4e86\u4e00\u4e9b\u76f8\u5173\u7684\u4ee3\u7801\u793a\u4f8b\u3002\u4f60\u8fd8\u5b66\u4e60\u4e86\u7f16\u5199\u6574\u6d01\u4ee3\u7801\u7684\u6700\u4f73\u5b9e\u8df5\uff0c\u4ee5\u53ca\u5982\u4f55\u907f\u514d\u5faa\u73af\u76f8\u5173\u7684\u5e38\u89c1\u9677\u9631\u3002<\/p>\n
                  \u60f3\u4e86\u89e3\u66f4\u591a\u5173\u4e8eJava\u7684\u5185\u5bb9\uff0c\u8bf7\u67e5\u770b\u6211\u4eec\u7684Java\u7f16\u7801\u7cfb\u5217\u6559\u7a0b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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