{"id":95033,"date":"2026-08-16T01:25:04","date_gmt":"2026-08-15T17:25:04","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/95033.html"},"modified":"2026-08-16T01:25:04","modified_gmt":"2026-08-15T17:25:04","slug":"%e6%9d%a1%e4%bb%b6%e6%8e%a7%e5%88%b6%ef%bc%9aif-switch","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/95033.html","title":{"rendered":"\u6761\u4ef6\u63a7\u5236\uff1aif \/ switch"},"content":{"rendered":"

\u6761\u4ef6\u63a7\u5236：if \/ switch<\/h2>\n

\u7a0b\u5e8f\u4e0d\u662f\u6c38\u8fdc\u4ece\u4e0a\u5230\u4e0b\u987a\u5e8f\u6267\u884c\u7684\u3002\u672c\u8282\u5b66\u4e60\u8ba9\u7a0b\u5e8f"\u505a\u5224\u65ad"\u7684\u4e24\u79cd\u8bed\u53e5：if \u8bed\u53e5\u548c switch \u8bed\u53e5\u3002<\/p>\n

\u4e00\u3001if \u8bed\u53e5\u7684\u4e09\u79cd\u5f62\u5f0f<\/h3>\n

1. \u5355\u5206\u652f if<\/h4>\n

int<\/span> score =<\/span> 85<\/span>;<\/span>
\nif<\/span> (<\/span>score >=<\/span> 60<\/span>)<\/span> {<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u53ca\u683c\u4e86"<\/span>)<\/span>;<\/span>
\n}<\/span><\/p>\n

\u6761\u4ef6\u4e3a true \u624d\u6267\u884c\u5927\u62ec\u53f7\u5185\u7684\u4ee3\u7801\u3002<\/p>\n

2. if-else \u53cc\u5206\u652f<\/h4>\n

int<\/span> score =<\/span> 45<\/span>;<\/span>
\nif<\/span> (<\/span>score >=<\/span> 60<\/span>)<\/span> {<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u53ca\u683c\u4e86"<\/span>)<\/span>;<\/span>
\n}<\/span> else<\/span> {<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u4e0d\u53ca\u683c，\u7ee7\u7eed\u52aa\u529b"<\/span>)<\/span>;<\/span>
\n}<\/span><\/p>\n

\u4e8c\u9009\u4e00，\u5fc5\u8d70\u5176\u4e00\u3002<\/p>\n

3. if-else if-else \u591a\u5206\u652f<\/h4>\n

int<\/span> score =<\/span> 92<\/span>;<\/span>
\nif<\/span> (<\/span>score >=<\/span> 90<\/span>)<\/span> {<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u4f18\u79c0"<\/span>)<\/span>;<\/span>
\n}<\/span> else<\/span> if<\/span> (<\/span>score >=<\/span> 80<\/span>)<\/span> {<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u826f\u597d"<\/span>)<\/span>;<\/span>
\n}<\/span> else<\/span> if<\/span> (<\/span>score >=<\/span> 60<\/span>)<\/span> {<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u53ca\u683c"<\/span>)<\/span>;<\/span>
\n}<\/span> else<\/span> {<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u4e0d\u53ca\u683c"<\/span>)<\/span>;<\/span>
\n}<\/span><\/p>\n

\u4ece\u4e0a\u5f80\u4e0b\u9010\u4e2a\u5224\u65ad，\u4e00\u65e6\u67d0\u4e2a\u6761\u4ef6\u6210\u7acb，\u540e\u9762\u7684\u5206\u652f\u4e0d\u518d\u5224\u65ad\u3002<\/p>\n

\u6ce8\u610f\u6761\u4ef6\u7684\u4e66\u5199\u987a\u5e8f：\u8303\u56f4\u5224\u65ad\u8981\u4ece\u5c0f\u5230\u5927\u6216\u4ece\u5927\u5230\u5c0f\u6392\u5217，\u6bd4\u5982\u4e0a\u9762\u7684 score >= 90 \u5fc5\u987b\u5199\u5728 score >= 80 \u524d\u9762，\u5426\u5219 92 \u5206\u4f1a\u88ab\u5f53\u6210"\u826f\u597d"\u3002<\/p>\n

\u4e8c\u3001if \u7684\u5e38\u89c1\u5751<\/h3>\n

1. \u5927\u62ec\u53f7\u5efa\u8bae\u4e0d\u8981\u7701\u7565<\/h4>\n

if<\/span> (<\/span>score >=<\/span> 60<\/span>)<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u53ca\u683c"<\/span>)<\/span>;<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u8fd9\u662f\u53e6\u4e00\u6761\u8bed\u53e5"<\/span>)<\/span>;<\/span> \/\/ \u6ce8\u610f：\u8fd9\u884c\u4e0d\u5728 if \u91cc！<\/span><\/p>\n

Java \u5141\u8bb8 if \u540e\u9762\u53ea\u8ddf\u4e00\u6761\u8bed\u53e5，\u4f46\u8fd9\u6837\u6781\u6613\u5199\u9519\u3002\u59cb\u7ec8\u52a0\u82b1\u62ec\u53f7\u662f\u826f\u597d\u4e60\u60ef\u3002<\/p>\n

2. \u5224\u65ad\u76f8\u7b49\u8981\u7528 == \u800c\u4e0d\u662f =<\/h4>\n

if<\/span> (<\/span>score =<\/span> 60<\/span>)<\/span> {<\/span> \/\/ \u7f16\u8bd1\u62a5\u9519：int \u4e0d\u80fd\u8f6c boolean<\/span><\/p>\n

= \u662f\u8d4b\u503c，== \u624d\u662f\u6bd4\u8f83，\u5199\u9519\u4f1a\u5bfc\u81f4\u7f16\u8bd1\u9519\u8bef\u6216\u903b\u8f91\u9519\u8bef\u3002<\/p>\n

3. \u6d6e\u70b9\u6570\u4e0d\u8981\u76f4\u63a5\u6bd4\u8f83\u76f8\u7b49<\/h4>\n

double<\/span> a =<\/span> 0.1<\/span> +<\/span> 0.2<\/span>;<\/span> \/\/ \u5b9e\u9645\u662f 0.30000000000000004<\/span>
\nif<\/span> (<\/span>a ==<\/span> 0.3<\/span>)<\/span> {<\/span> \/\/ false！<\/span><\/p>\n

\u6d6e\u70b9\u6570\u6709\u7cbe\u5ea6\u8bef\u5dee，\u5224\u65ad\u76f8\u7b49\u5e94\u8be5\u7528\u5dee\u503c\u5c0f\u4e8e\u4e00\u4e2a\u6781\u5c0f\u503c：<\/p>\n

if<\/span> (<\/span>Math<\/span>.<\/span>abs<\/span>(<\/span>a –<\/span> 0.3<\/span>)<\/span> <<\/span> 0.000001<\/span>)<\/span> {<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u8fd1\u4f3c\u76f8\u7b49"<\/span>)<\/span>;<\/span>
\n}<\/span><\/p>\n

\u4e09\u3001switch \u8bed\u53e5<\/h3>\n

switch \u9002\u5408\u5bf9\u67d0\u4e2a\u53d8\u91cf\u505a\u56fa\u5b9a\u503c\u5224\u65ad\u7684\u573a\u666f，\u6bd4 if-else if \u66f4\u6e05\u6670：<\/p>\n

int<\/span> day =<\/span> 3<\/span>;<\/span>
\nswitch<\/span> (<\/span>day)<\/span> {<\/span>
\n case<\/span> 1<\/span>:<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u661f\u671f\u4e00"<\/span>)<\/span>;<\/span>
\n break<\/span>;<\/span>
\n case<\/span> 2<\/span>:<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u661f\u671f\u4e8c"<\/span>)<\/span>;<\/span>
\n break<\/span>;<\/span>
\n case<\/span> 3<\/span>:<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u661f\u671f\u4e09"<\/span>)<\/span>;<\/span>
\n break<\/span>;<\/span>
\n default<\/span>:<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u672a\u77e5\u7684\u65e5\u671f"<\/span>)<\/span>;<\/span>
\n break<\/span>;<\/span>
\n}<\/span><\/p>\n

\u6267\u884c\u6d41\u7a0b<\/h4>\n
  • \u62ff day \u7684\u503c\u548c\u6bcf\u4e2a case \u6bd4\u8f83<\/li>\n
  • \u5339\u914d\u6210\u529f，\u4ece\u8be5 case \u5f00\u59cb\u5f80\u4e0b\u6267\u884c<\/li>\n
  • \u9047\u5230 break \u624d\u8df3\u51fa switch；\u6ca1\u6709 break \u4f1a\u53d1\u751f"\u7a7f\u900f"，\u7ee7\u7eed\u6267\u884c\u540e\u9762\u7684 case<\/li>\n

    \u7a7f\u900f\u793a\u4f8b<\/h4>\n

    int<\/span> month =<\/span> 7<\/span>;<\/span>
    \nswitch<\/span> (<\/span>month)<\/span> {<\/span>
    \n case<\/span> 1<\/span>:<\/span> case<\/span> 3<\/span>:<\/span> case<\/span> 5<\/span>:<\/span> case<\/span> 7<\/span>:<\/span> case<\/span> 8<\/span>:<\/span> case<\/span> 10<\/span>:<\/span> case<\/span> 12<\/span>:<\/span>
    \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"31 \u5929"<\/span>)<\/span>;<\/span>
    \n break<\/span>;<\/span>
    \n case<\/span> 4<\/span>:<\/span> case<\/span> 6<\/span>:<\/span> case<\/span> 9<\/span>:<\/span> case<\/span> 11<\/span>:<\/span>
    \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"30 \u5929"<\/span>)<\/span>;<\/span>
    \n break<\/span>;<\/span>
    \n default<\/span>:<\/span>
    \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"2 \u6708，28 \u6216 29 \u5929"<\/span>)<\/span>;<\/span>
    \n}<\/span><\/p>\n

    \u5229\u7528\u7a7f\u900f\u7279\u6027，\u591a\u4e2a\u503c\u5171\u7528\u4e00\u6bb5\u903b\u8f91，\u4ee3\u7801\u975e\u5e38\u7b80\u6d01\u3002<\/p>\n

    \u652f\u6301\u7684\u7c7b\u578b<\/h4>\n

    switch \u53ef\u4ee5\u5224\u65ad：byte\u3001short\u3001int\u3001char\u3001String（JDK 7+）\u3001\u679a\u4e3e\u3002<\/p>\n

    String<\/span> fruit =<\/span> "apple"<\/span>;<\/span>
    \nswitch<\/span> (<\/span>fruit)<\/span> {<\/span>
    \n case<\/span> "apple"<\/span>:<\/span>
    \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u82f9\u679c"<\/span>)<\/span>;<\/span>
    \n break<\/span>;<\/span>
    \n case<\/span> "banana"<\/span>:<\/span>
    \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u9999\u8549"<\/span>)<\/span>;<\/span>
    \n break<\/span>;<\/span>
    \n default<\/span>:<\/span>
    \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u4e0d\u8ba4\u8bc6\u7684\u6c34\u679c"<\/span>)<\/span>;<\/span>
    \n}<\/span><\/p>\n

    \u73b0\u4ee3\u5199\u6cd5：\u7bad\u5934\u8868\u8fbe\u5f0f（JDK 14+）<\/h4>\n

    JDK 14 \u8d77\u53ef\u4ee5\u7528 -> \u5199\u6cd5，\u81ea\u52a8 break，\u4e0d\u4f1a\u7a7f\u900f：<\/p>\n

    switch<\/span> (<\/span>day)<\/span> {<\/span>
    \n case<\/span> 1<\/span> -><\/span> System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u661f\u671f\u4e00"<\/span>)<\/span>;<\/span>
    \n case<\/span> 2<\/span> -><\/span> System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u661f\u671f\u4e8c"<\/span>)<\/span>;<\/span>
    \n default<\/span> -><\/span> System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u5176\u4ed6"<\/span>)<\/span>;<\/span>
    \n}<\/span><\/p>\n

    \u751a\u81f3\u53ef\u4ee5\u4f5c\u4e3a\u8868\u8fbe\u5f0f\u8fd4\u56de\u503c（JDK 17 \u5df2\u7a33\u5b9a）：<\/p>\n

    String<\/span> name =<\/span> switch<\/span> (<\/span>day)<\/span> {<\/span>
    \n case<\/span> 1<\/span> -><\/span> "\u661f\u671f\u4e00"<\/span>;<\/span>
    \n case<\/span> 2<\/span> -><\/span> "\u661f\u671f\u4e8c"<\/span>;<\/span>
    \n default<\/span> -><\/span> "\u5176\u4ed6"<\/span>;<\/span>
    \n}<\/span>;<\/span><\/p>\n

    \u56db\u3001if \u8fd8\u662f switch？<\/h3>\n
      \n
    • \u5224\u65ad\u8303\u56f4\u3001\u5927\u5c0f\u5173\u7cfb（\u5206\u6570\u3001\u5e74\u9f84）\u2192 \u7528 if<\/li>\n
    • \u5224\u65ad\u56fa\u5b9a\u503c（\u661f\u671f\u51e0\u3001\u83dc\u5355\u9009\u9879）\u2192 \u7528 switch，\u4ee3\u7801\u66f4\u76f4\u89c2<\/li>\n<\/ul>\n

      \u4e94\u3001\u7efc\u5408\u7ec3\u4e60<\/h3>\n

      \u5224\u65ad\u67d0\u5e74\u662f\u5e73\u5e74\u8fd8\u662f\u95f0\u5e74（\u80fd\u88ab 4 \u6574\u9664\u4f46\u4e0d\u80fd\u88ab 100 \u6574\u9664，\u6216\u80fd\u88ab 400 \u6574\u9664）：<\/p>\n

      int<\/span> year =<\/span> 2024<\/span>;<\/span>
      \nif<\/span> (<\/span>(<\/span>year %<\/span> 4<\/span> ==<\/span> 0<\/span> &&<\/span> year %<\/span> 100<\/span> !=<\/span> 0<\/span>)<\/span> ||<\/span> year %<\/span> 400<\/span> ==<\/span> 0<\/span>)<\/span> {<\/span>
      \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>year +<\/span> " \u662f\u95f0\u5e74"<\/span>)<\/span>;<\/span>
      \n}<\/span> else<\/span> {<\/span>
      \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>year +<\/span> " \u662f\u5e73\u5e74"<\/span>)<\/span>;<\/span>
      \n}<\/span><\/p>\n

      \u516d\u3001\u5c0f\u7ed3<\/h3>\n
        \n
      • if \u9002\u5408\u8303\u56f4\u5224\u65ad，switch \u9002\u5408\u56fa\u5b9a\u503c\u5224\u65ad<\/li>\n
      • \u6bcf\u4e2a case \u522b\u5fd8\u4e86 break（\u6216\u7528 -> \u5199\u6cd5）<\/li>\n
      • \u5224\u65ad\u76f8\u7b49\u7528 ==，\u6d6e\u70b9\u6570\u6bd4\u8f83\u8981\u5c0f\u5fc3\u7cbe\u5ea6<\/li>\n
      • \u5927\u62ec\u53f7\u59cb\u7ec8\u52a0\u4e0a，\u907f\u514d\u60ac\u7a7a else \u95ee\u9898<\/li>\n<\/ul>\n

        \u4e0b\u4e00\u8282\u5b66\u4e60\u5faa\u73af\u8bed\u53e5\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

        \u6761\u4ef6\u63a7\u5236：if \/ switch\u7a0b\u5e8f\u4e0d\u662f\u6c38\u8fdc\u4ece\u4e0a\u5230\u4e0b\u987a\u5e8f\u6267\u884c\u7684\u3002\u672c\u8282\u5b66\u4e60\u8ba9\u7a0b\u5e8f\\”\u505a\u5224\u65ad\\”\u7684\u4e24\u79cd\u8bed\u53e5：if \u8bed\u53e5\u548c switch \u8bed\u53e5\u3002\u4e00\u3001if \u8bed\u53e5\u7684\u4e09\u79cd\u5f62\u5f0f
        \n1. \u5355\u5206\u652f if
        \nint score 85;
        \nif (score > 60) {System.out.println(\\”\u53ca\u683c\u4e86\\”);
        \n}\u6761\u4ef6\u4e3a true \u624d\u6267\u884c\u5927\u62ec\u53f7\u5185\u7684\u4ee3\u7801\u3002
        \n2. if-else \u53cc\u5206\u652f
        \nint score 45;
        \nif (score > 60) {System.o<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[99,190],"topic":[],"class_list":["post-95033","post","type-post","status-publish","format-standard","hentry","category-server","tag-java","tag-190"],"yoast_head":"\n\u6761\u4ef6\u63a7\u5236\uff1aif \/ switch - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/95033.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u6761\u4ef6\u63a7\u5236\uff1aif \/ switch - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u6761\u4ef6\u63a7\u5236：if \/ switch\u7a0b\u5e8f\u4e0d\u662f\u6c38\u8fdc\u4ece\u4e0a\u5230\u4e0b\u987a\u5e8f\u6267\u884c\u7684\u3002\u672c\u8282\u5b66\u4e60\u8ba9\u7a0b\u5e8f"\u505a\u5224\u65ad"\u7684\u4e24\u79cd\u8bed\u53e5：if \u8bed\u53e5\u548c switch \u8bed\u53e5\u3002\u4e00\u3001if \u8bed\u53e5\u7684\u4e09\u79cd\u5f62\u5f0f 1. \u5355\u5206\u652f if int score 85; 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