{"id":95032,"date":"2026-08-16T01:25:02","date_gmt":"2026-08-15T17:25:02","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/95032.html"},"modified":"2026-08-16T01:25:02","modified_gmt":"2026-08-15T17:25:02","slug":"%e5%be%aa%e7%8e%af%e6%8e%a7%e5%88%b6%ef%bc%9afor-while-do-while","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/95032.html","title":{"rendered":"\u5faa\u73af\u63a7\u5236\uff1afor \/ while \/ do-while"},"content":{"rendered":"

\u5faa\u73af\u63a7\u5236：for \/ while \/ do-while<\/h2>\n

\u8ba1\u7b97\u673a\u6700\u64c5\u957f\u7684\u5c31\u662f\u91cd\u590d\u52b3\u52a8\u3002\u672c\u8282\u5b66\u4e60\u4e09\u79cd\u5faa\u73af\u8bed\u53e5：for\u3001while\u3001do-while，\u4ee5\u53ca break \u548c continue \u4e24\u4e2a\u63a7\u5236\u5173\u952e\u5b57\u3002<\/p>\n

\u4e00\u3001for \u5faa\u73af<\/h3>\n

\u8bed\u6cd5\u7ed3\u6784：<\/p>\n

for<\/span> (<\/span>\u521d\u59cb\u5316;<\/span> \u6761\u4ef6\u5224\u65ad;<\/span> \u6b65\u8fdb)<\/span> {<\/span>
\n \/\/ \u5faa\u73af\u4f53<\/span>
\n}<\/span><\/p>\n

for<\/span> (<\/span>int<\/span> i =<\/span> 1<\/span>;<\/span> i <=<\/span> 5<\/span>;<\/span> i++<\/span>)<\/span> {<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u7b2c "<\/span> +<\/span> i +<\/span> " \u6b21\u5faa\u73af"<\/span>)<\/span>;<\/span>
\n}<\/span><\/p>\n

\u6267\u884c\u6d41\u7a0b：<\/p>\n

  • \u521d\u59cb\u5316：int i = 1，\u53ea\u6267\u884c\u4e00\u6b21<\/li>\n
  • \u6761\u4ef6\u5224\u65ad：i <= 5，\u4e3a true \u7ee7\u7eed，\u4e3a false \u9000\u51fa<\/li>\n
  • \u6267\u884c\u5faa\u73af\u4f53：\u6253\u5370<\/li>\n
  • \u6b65\u8fdb：i++<\/li>\n
  • \u56de\u5230\u7b2c 2 \u6b65<\/li>\n

    for \u5faa\u73af\u9002\u5408\u5faa\u73af\u6b21\u6570\u786e\u5b9a\u7684\u573a\u666f，\u6bd4\u5982\u904d\u5386\u6570\u7ec4\u3001\u8ba1\u6570\u3002<\/p>\n

    \u5e38\u7528\u53d8\u4f53<\/h4>\n

    \/\/ \u5012\u5e8f<\/span>
    \nfor<\/span> (<\/span>int<\/span> i =<\/span> 10<\/span>;<\/span> i >=<\/span> 1<\/span>;<\/span> i—<\/span>)<\/span> {<\/span>
    \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>i)<\/span>;<\/span>
    \n}<\/span><\/p>\n

    \/\/ \u6b65\u8fdb\u4e3a 2（\u6253\u5370\u5076\u6570）<\/span>
    \nfor<\/span> (<\/span>int<\/span> i =<\/span> 2<\/span>;<\/span> i <=<\/span> 10<\/span>;<\/span> i +=<\/span> 2<\/span>)<\/span> {<\/span>
    \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>i)<\/span>;<\/span>
    \n}<\/span><\/p>\n

    \/\/ \u5faa\u73af\u53d8\u91cf\u5728\u5faa\u73af\u5916\u5b9a\u4e49<\/span>
    \nint<\/span> i;<\/span>
    \nfor<\/span> (<\/span>i =<\/span> 0<\/span>;<\/span> i <<\/span> 10<\/span>;<\/span> i++<\/span>)<\/span> {<\/span>
    \n \/\/ …<\/span>
    \n}<\/span><\/p>\n

    \u4e8c\u3001while \u5faa\u73af<\/h3>\n

    while<\/span> (<\/span>\u6761\u4ef6)<\/span> {<\/span>
    \n \/\/ \u5faa\u73af\u4f53<\/span>
    \n}<\/span><\/p>\n

    \u5148\u5224\u65ad，\u540e\u6267\u884c\u3002\u6761\u4ef6\u4e3a false \u65f6\u4e00\u6b21\u90fd\u4e0d\u6267\u884c\u3002<\/p>\n

    int<\/span> i =<\/span> 1<\/span>;<\/span>
    \nwhile<\/span> (<\/span>i <=<\/span> 5<\/span>)<\/span> {<\/span>
    \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>i)<\/span>;<\/span>
    \n i++<\/span>;<\/span> \/\/ \u522b\u5fd8\u4e86\u6539\u53d8\u5faa\u73af\u6761\u4ef6，\u5426\u5219\u6b7b\u5faa\u73af<\/span>
    \n}<\/span><\/p>\n

    while \u9002\u5408\u5faa\u73af\u6b21\u6570\u4e0d\u786e\u5b9a\u7684\u573a\u666f，\u6bd4\u5982\u4e00\u76f4\u8bfb\u53d6\u8f93\u5165\u76f4\u5230\u8f93\u5165\u7ed3\u675f\u3001\u968f\u673a\u731c\u6570\u3002<\/p>\n

    \u4e09\u3001do-while \u5faa\u73af<\/h3>\n

    do<\/span> {<\/span>
    \n \/\/ \u5faa\u73af\u4f53<\/span>
    \n}<\/span> while<\/span> (<\/span>\u6761\u4ef6)<\/span>;<\/span><\/p>\n

    \u5148\u6267\u884c\u4e00\u6b21，\u518d\u5224\u65ad\u3002\u65e0\u8bba\u6761\u4ef6\u771f\u5047，\u5faa\u73af\u4f53\u81f3\u5c11\u6267\u884c\u4e00\u6b21\u3002<\/p>\n

    int<\/span> i =<\/span> 10<\/span>;<\/span>
    \ndo<\/span> {<\/span>
    \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u81f3\u5c11\u6267\u884c\u4e00\u6b21："<\/span> +<\/span> i)<\/span>;<\/span>
    \n i++<\/span>;<\/span>
    \n}<\/span> while<\/span> (<\/span>i <<\/span> 5<\/span>)<\/span>;<\/span>
    \n\/\/ \u8f93\u51fa\u4e00\u6b21：\u81f3\u5c11\u6267\u884c\u4e00\u6b21：10<\/span><\/p>\n

    \u5178\u578b\u5e94\u7528：\u83dc\u5355\u7cfb\u7edf\u2014\u2014\u5148\u663e\u793a\u83dc\u5355，\u7528\u6237\u9009\u62e9\u540e\u518d\u5224\u65ad\u662f\u5426\u7ee7\u7eed\u3002<\/p>\n

    \u56db\u3001\u4e09\u79cd\u5faa\u73af\u5bf9\u6bd4<\/h3>\n\n\u7279\u6027forwhiledo-while<\/tr>\n\n\n\n\n
    \u5224\u65ad\u65f6\u673a<\/td>\n\u5148\u5224\u65ad<\/td>\n\u5148\u5224\u65ad<\/td>\n\u540e\u5224\u65ad<\/td>\n<\/tr>\n
    \u6700\u5c11\u6267\u884c\u6b21\u6570<\/td>\n0 \u6b21<\/td>\n0 \u6b21<\/td>\n1 \u6b21<\/td>\n<\/tr>\n
    \u9002\u7528\u573a\u666f<\/td>\n\u6b21\u6570\u786e\u5b9a<\/td>\n\u6b21\u6570\u4e0d\u786e\u5b9a<\/td>\n\u81f3\u5c11\u6267\u884c\u4e00\u6b21<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    \u4e09\u8005\u53ef\u4ee5\u4e92\u76f8\u8f6c\u6362，\u9009\u6700\u8d34\u5408\u573a\u666f\u7684\u5373\u53ef\u3002<\/p>\n

    \u4e94\u3001break \u4e0e continue<\/h3>\n

    break：\u7acb\u5373\u7ec8\u6b62\u6574\u4e2a\u5faa\u73af<\/h4>\n

    for<\/span> (<\/span>int<\/span> i =<\/span> 1<\/span>;<\/span> i <=<\/span> 10<\/span>;<\/span> i++<\/span>)<\/span> {<\/span>
    \n if<\/span> (<\/span>i ==<\/span> 5<\/span>)<\/span> {<\/span>
    \n break<\/span>;<\/span> \/\/ \u5faa\u73af\u5230\u6b64\u4e3a\u6b62<\/span>
    \n }<\/span>
    \n System<\/span>.<\/span>out.<\/span>print<\/span>(<\/span>i +<\/span> " "<\/span>)<\/span>;<\/span> \/\/ \u8f93\u51fa：1 2 3 4<\/span>
    \n}<\/span><\/p>\n

    continue：\u8df3\u8fc7\u672c\u6b21\u5faa\u73af，\u7ee7\u7eed\u4e0b\u4e00\u6b21<\/h4>\n

    for<\/span> (<\/span>int<\/span> i =<\/span> 1<\/span>;<\/span> i <=<\/span> 10<\/span>;<\/span> i++<\/span>)<\/span> {<\/span>
    \n if<\/span> (<\/span>i %<\/span> 2<\/span> ==<\/span> 0<\/span>)<\/span> {<\/span>
    \n continue<\/span>;<\/span> \/\/ \u5076\u6570\u8df3\u8fc7，\u4e0d\u6253\u5370<\/span>
    \n }<\/span>
    \n System<\/span>.<\/span>out.<\/span>print<\/span>(<\/span>i +<\/span> " "<\/span>)<\/span>;<\/span> \/\/ \u8f93\u51fa：1 3 5 7 9<\/span>
    \n}<\/span><\/p>\n

    \u5d4c\u5957\u5faa\u73af\u4e2d\u7684\u6807\u7b7e break（\u4e86\u89e3）<\/h4>\n

    outer:<\/span>
    \nfor<\/span> (<\/span>int<\/span> i =<\/span> 0<\/span>;<\/span> i <<\/span> 3<\/span>;<\/span> i++<\/span>)<\/span> {<\/span>
    \n for<\/span> (<\/span>int<\/span> j =<\/span> 0<\/span>;<\/span> j <<\/span> 3<\/span>;<\/span> j++<\/span>)<\/span> {<\/span>
    \n if<\/span> (<\/span>j ==<\/span> 1<\/span>)<\/span> {<\/span>
    \n break<\/span> outer;<\/span> \/\/ \u76f4\u63a5\u8df3\u51fa\u5916\u5c42\u5faa\u73af<\/span>
    \n }<\/span>
    \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>i +<\/span> ","<\/span> +<\/span> j)<\/span>;<\/span>
    \n }<\/span>
    \n}<\/span>
    \n\/\/ \u53ea\u8f93\u51fa 0,0<\/span><\/p>\n

    \u5b9e\u9645\u5f00\u53d1\u4e2d\u6807\u7b7e break \u5f88\u5c11\u7528，\u80fd\u7528\u65b9\u6cd5\u5c01\u88c5\u5c31\u5c3d\u91cf\u4e0d\u7528\u3002<\/p>\n

    \u516d\u3001\u5faa\u73af\u7ecf\u5178\u7ec3\u4e60<\/h3>\n

    1. \u8ba1\u7b97 1 \u5230 100 \u7684\u548c<\/h4>\n

    int<\/span> sum =<\/span> 0<\/span>;<\/span>
    \nfor<\/span> (<\/span>int<\/span> i =<\/span> 1<\/span>;<\/span> i <=<\/span> 100<\/span>;<\/span> i++<\/span>)<\/span> {<\/span>
    \n sum +=<\/span> i;<\/span>
    \n}<\/span>
    \nSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"1+2+…+100 = "<\/span> +<\/span> sum)<\/span>;<\/span> \/\/ 5050<\/span><\/p>\n

    2. \u6253\u5370\u4e5d\u4e5d\u4e58\u6cd5\u8868<\/h4>\n

    for<\/span> (<\/span>int<\/span> i =<\/span> 1<\/span>;<\/span> i <=<\/span> 9<\/span>;<\/span> i++<\/span>)<\/span> {<\/span>
    \n for<\/span> (<\/span>int<\/span> j =<\/span> 1<\/span>;<\/span> j <=<\/span> i;<\/span> j++<\/span>)<\/span> {<\/span>
    \n System<\/span>.<\/span>out.<\/span>print<\/span>(<\/span>j +<\/span> "*"<\/span> +<\/span> i +<\/span> "="<\/span> +<\/span> (<\/span>i *<\/span> j)<\/span> +<\/span> "\\\\t"<\/span>)<\/span>;<\/span>
    \n }<\/span>
    \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>)<\/span>;<\/span> \/\/ \u6362\u884c<\/span>
    \n}<\/span><\/p>\n

    3. \u5224\u65ad\u8d28\u6570<\/h4>\n

    int<\/span> num =<\/span> 97<\/span>;<\/span>
    \nboolean<\/span> isPrime =<\/span> true<\/span>;<\/span>
    \nfor<\/span> (<\/span>int<\/span> i =<\/span> 2<\/span>;<\/span> i <=<\/span> Math<\/span>.<\/span>sqrt<\/span>(<\/span>num)<\/span>;<\/span> i++<\/span>)<\/span> {<\/span>
    \n if<\/span> (<\/span>num %<\/span> i ==<\/span> 0<\/span>)<\/span> {<\/span>
    \n isPrime =<\/span> false<\/span>;<\/span>
    \n break<\/span>;<\/span> \/\/ \u5df2\u786e\u5b9a\u4e0d\u662f\u8d28\u6570，\u63d0\u524d\u7ed3\u675f<\/span>
    \n }<\/span>
    \n}<\/span>
    \nSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>num +<\/span> (<\/span>isPrime ?<\/span> " \u662f\u8d28\u6570"<\/span> :<\/span> " \u4e0d\u662f\u8d28\u6570"<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

    \u4e03\u3001\u6b7b\u5faa\u73af\u4e0e\u89c4\u907f<\/h3>\n

    \/\/ \u7ecf\u5178\u6b7b\u5faa\u73af<\/span>
    \nwhile<\/span> (<\/span>true<\/span>)<\/span> {<\/span>
    \n \/\/ \u914d\u5408 break \u4f7f\u7528<\/span>
    \n}<\/span><\/p>\n

    \u6b7b\u5faa\u73af\u5e38\u7528\u4e8e\u4e8b\u4ef6\u76d1\u542c\u3001\u670d\u52a1\u5668\u7b49\u5f85\u8bf7\u6c42\u7b49\u573a\u666f，\u5fc5\u987b\u4fdd\u8bc1\u5185\u90e8\u6709\u8df3\u51fa\u6761\u4ef6\u3002\u666e\u901a\u5faa\u73af\u5199\u6b7b\u5faa\u73af（\u5982\u5fd8\u8bb0 i++）\u662f\u5e38\u89c1 bug\u3002<\/p>\n

    \u516b\u3001\u5c0f\u7ed3<\/h3>\n
      \n
    • for \u9002\u5408\u6b21\u6570\u786e\u5b9a，while \u9002\u5408\u6b21\u6570\u4e0d\u786e\u5b9a，do-while \u81f3\u5c11\u6267\u884c\u4e00\u6b21<\/li>\n
    • break \u7ed3\u675f\u6574\u4e2a\u5faa\u73af，continue \u8df3\u8fc7\u672c\u6b21<\/li>\n
    • \u5faa\u73af\u53d8\u91cf\u8981\u5728\u5faa\u73af\u4f53\u5185\u88ab\u66f4\u65b0，\u907f\u514d\u6b7b\u5faa\u73af<\/li>\n
    • \u5d4c\u5957\u5faa\u73af\u6ce8\u610f\u5185\u5916\u5c42\u53d8\u91cf\u7684\u547d\u540d\u533a\u5206<\/li>\n<\/ul>\n

      \u4e0b\u4e00\u8282\u5b66\u4e60\u6570\u7ec4\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

      \u5faa\u73af\u63a7\u5236：for \/ while \/ do-while\u8ba1\u7b97\u673a\u6700\u64c5\u957f\u7684\u5c31\u662f\u91cd\u590d\u52b3\u52a8\u3002\u672c\u8282\u5b66\u4e60\u4e09\u79cd\u5faa\u73af\u8bed\u53e5：for\u3001while\u3001do-while，\u4ee5\u53ca break \u548c continue \u4e24\u4e2a\u63a7\u5236\u5173\u952e\u5b57\u3002\u4e00\u3001for \u5faa\u73af
      \n\u8bed\u6cd5\u7ed3\u6784：
      \nfor (\u521d\u59cb\u5316; \u6761\u4ef6\u5224\u65ad; \u6b65\u8fdb) {\/\/ \u5faa\u73af\u4f53
      \n}for (int i 1; i < 5; i) {System.out.println(\\"\u7b2c \\" i \\" \u6b21\u5faa\u73af\\");
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