{"id":31498,"date":"2022-11-14T11:05:04","date_gmt":"2023-07-15T19:46:46","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/java-%e7%9a%84%e6%9d%a1%e4%bb%b6%e5%88%86%e6%94%af\/"},"modified":"2024-04-29T00:35:39","modified_gmt":"2024-04-28T16:35:39","slug":"java-%e7%9a%84%e6%9d%a1%e4%bb%b6%e5%88%86%e6%94%af","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java-%e7%9a%84%e6%9d%a1%e4%bb%b6%e5%88%86%e6%94%af\/","title":{"rendered":"Java \u7684\u6761\u4ef6\u5206\u652f"},"content":{"rendered":"<h2>\u9996\u5148<\/h2>\n<p>\u7531\u4e8e\u89e3\u91ca\u590d\u6742\u7684\u90e8\u5206\u4ecd\u7136\u56f0\u96be\uff0c\u56e0\u6b64\u9996\u5148\u9009\u62e9\u8be6\u7ec6\u5730\u63cf\u8ff0\u53ef\u4ee5\u505a\u7684\u57fa\u672c\u4e8b\u9879\u3002<\/p>\n<h3>\u6761\u4ef6\u5206\u5c90\u7684\u7f16\u5199\u65b9\u5f0f<\/h3>\n<pre class=\"post-pre\"><code><span class=\"k\">if<\/span><span class=\"o\">(<\/span><span class=\"n\">\u6761\u4ef6\u5f0f<\/span><span class=\"o\">){<\/span>\r\n  <span class=\"n\">\u51e6\u7406<\/span><span class=\"o\">;<\/span>\r\n  <span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>\u7528\u771f\u503c\u3001\u6bd4\u8f83\u8fd0\u7b97\u7b26\uff08\u4f8b\u5982==\uff0c&lt;\u7b49\uff09\uff0c\u903b\u8f91\u8fd0\u7b97\u7b26\uff08&amp;&amp;\uff0c||\uff0c!\uff09\u7b49\u6765\u7f16\u5199\u6761\u4ef6\u8bed\u53e5\uff0c\u8fd9\u662f\u57fa\u672c\u5f62\u5f0f\u3002<\/p>\n<h3>\u59a8\u788d{}<\/h3>\n<p>\u5f53\u9700\u8981\u5c06\u591a\u4e2a\u5904\u7406\u6b65\u9aa4\u5408\u5e76\u65f6\u4f7f\u7528\uff0c{ }\u540e\u4e0d\u9700\u8981\u5206\u53f7\u3002<\/p>\n<pre class=\"post-pre\"><code>\r\n<span class=\"kt\">int<\/span> <span class=\"n\">x<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">40<\/span>\r\n\r\n<span class=\"k\">if<\/span> <span class=\"o\">(<\/span><span class=\"n\">x<\/span> <span class=\"o\">&gt;=<\/span> <span class=\"mi\">30<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n   <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"x\u306f\uff13\uff10\u4ee5\u4e0a\u3002\"<\/span><span class=\"o\">);<\/span>\r\n<span class=\"o\">}<\/span> <span class=\"k\">else<\/span> <span class=\"k\">if<\/span> <span class=\"o\">(<\/span><span class=\"n\">x<\/span> <span class=\"o\">&gt;<\/span> <span class=\"mi\">20<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n   <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"x\u306f20\u3088\u308a\u5927\u304d\u304f\uff13\uff10\u3088\u308a\u5c0f\u3055\u3044\u3002\"<\/span><span class=\"o\">);<\/span>\r\n<span class=\"o\">}<\/span> <span class=\"k\">else<\/span> <span class=\"o\">{<\/span>\r\n   <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"x\u306f20\u3088\u308a\u4ee5\u4e0b\u3002\"<\/span><span class=\"o\">);<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<span class=\"c1\">\/\/\u4eca\u56de\u306f\u6700\u521d\u306e\u51e6\u7406\u3067\u5b9f\u884c\u3055\u308c\u308b<\/span>\r\n<\/code><\/pre>\n<p>\u4f46\u5982\u679c\u9700\u8981\uff0celse if \u8bed\u53e5\u53ef\u4ee5\u8fde\u7eed\u5199\u591a\u4e2a\uff0c\u4f46\u53ea\u6709\u7b2c\u4e00\u4e2a\u7b26\u5408\u6761\u4ef6\u7684\u8bed\u53e5\u4f1a\u6267\u884c\u3002<\/p>\n<h3>\u5207\u6362\u8bed\u53e5<\/h3>\n<p>\u5f53\u6761\u4ef6\u7684\u503c\u4e0e case \u7684\u503c\u5339\u914d\u65f6\uff0c\u5c06\u6267\u884c\u5904\u7406\u3002<br \/>\n\u6ce8\u610f\u4e0d\u8981\u5fd8\u8bb0\u5192\u53f7\uff08:\uff09\u7b49\u7b49\u653e\u5728 case \u540e\u9762\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">switch<\/span><span class=\"o\">(<\/span><span class=\"n\">\u6761\u4ef6\u306e\u5024<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n  <span class=\"k\">case<\/span> <span class=\"n\">\u5024<\/span> <span class=\"mi\">1<\/span><span class=\"o\">:<\/span>\r\n      <span class=\"n\">\u51e6\u7406<\/span><span class=\"o\">;<\/span>\r\n      <span class=\"k\">break<\/span><span class=\"o\">;<\/span>\r\n  <span class=\"k\">case<\/span> <span class=\"n\">\u5024<\/span> <span class=\"mi\">2<\/span><span class=\"o\">:<\/span>\r\n      <span class=\"n\">\u51e6\u7406<\/span><span class=\"o\">;<\/span>\r\n      <span class=\"k\">break<\/span><span class=\"o\">;<\/span>\r\n  <span class=\"k\">case<\/span> <span class=\"n\">\u5024<\/span> <span class=\"mi\">3<\/span><span class=\"o\">:<\/span>\r\n      <span class=\"n\">\u51e6\u7406<\/span><span class=\"o\">;<\/span>\r\n      <span class=\"k\">break<\/span><span class=\"o\">;<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5f53\u6ee1\u8db3\u62ec\u53f7\u5185\u6761\u4ef6\u7684\u503c\u548ccase\u7684\u503c\u4e3a\u201c==\u201d\u65f6\uff0c\u6267\u884c\u5904\u7406\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kt\">int<\/span> <span class=\"o\">=<\/span> <span class=\"n\">x<\/span>\r\n\r\n<span class=\"nf\">switch<\/span><span class=\"o\">(<\/span><span class=\"n\">x<\/span> <span class=\"o\">%<\/span> <span class=\"mi\">2<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span> <span class=\"c1\">\/\/\u6761\u4ef6\u306e\u5024<\/span>\r\n\r\n  <span class=\"k\">case<\/span> <span class=\"mi\">0<\/span><span class=\"o\">:<\/span> <span class=\"c1\">\/\/true<\/span>\r\n      <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"\u3053\u308c\u306f\u5076\u6570\"<\/span><span class=\"o\">);<\/span> <span class=\"c1\">\/\/\u3053\u308c\u304c\u5b9f\u884c<\/span>\r\n      <span class=\"k\">break<\/span><span class=\"o\">;<\/span>\r\n  <span class=\"k\">case<\/span> <span class=\"mi\">1<\/span><span class=\"o\">:<\/span>\r\n      <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"\u3053\u308c\u306f\u5947\u6570\"<\/span><span class=\"o\">);<\/span>\r\n      <span class=\"k\">break<\/span><span class=\"o\">;<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h3>\u4e2d\u65ad<\/h3>\n<p>\u5728switch\u8bed\u53e5\u4e2d\uff0cbreak\u975e\u5e38\u91cd\u8981\u3002\u5982\u679c\u6ca1\u6709break\uff0c\u6240\u6709\u7684\u8bed\u53e5\u90fd\u4f1a\u88ab\u6267\u884c\uff0c\u6240\u4ee5\u5728\u4f7f\u7528switch\u8bed\u53e5\u65f6\u4e00\u5b9a\u8981\u8bb0\u5f97\u4f7f\u7528break\u3002<br \/>\n\u203b\u5728\u6709\u610f\u8ba9case\u8bed\u53e5\u7684\u5904\u7406\u7ee7\u7eed\u6267\u884c\u7684\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u7701\u7565break\u3002\u8fd9\u88ab\u79f0\u4e3a&#8221;fall-through&#8221;\uff0c\u867d\u7136\u6211\u76ee\u524d\u5bf9\u5b83\u7684\u7528\u9014\u4e0d\u592a\u6e05\u695a\uff0c\u4f46\u4e3a\u4e86\u5c06\u5176\u4f5c\u4e3a\u4e00\u4e2a\u8bcd\u7559\u5b58\u4e0b\u6765\u800c\u8fdb\u884c\u63cf\u8ff0\u3002<\/p>\n<h3>\u9ed8\u8ba4<\/h3>\n<p>\u7c7b\u4f3c\u4e8e if \u8bed\u53e5\u4e2d\u7684 else \u90e8\u5206\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kt\">int<\/span> <span class=\"n\">number<\/span> <span class=\"o\">=<\/span> <span class=\"o\">-<\/span><span class=\"mi\">1<\/span><span class=\"o\">;<\/span>\r\n\r\n <span class=\"k\">switch<\/span><span class=\"o\">(<\/span><span class=\"n\">number<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n  <span class=\"k\">case<\/span> <span class=\"mi\">0<\/span><span class=\"o\">:<\/span>\r\n      <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"0\u3067\u3059\"<\/span><span class=\"o\">);<\/span>\r\n      <span class=\"k\">break<\/span><span class=\"o\">;<\/span>\r\n  <span class=\"k\">case<\/span> <span class=\"mi\">1<\/span><span class=\"o\">:<\/span>\r\n      <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"1\u3067\u3059\"<\/span><span class=\"o\">);<\/span>\r\n      <span class=\"k\">break<\/span><span class=\"o\">;<\/span>\r\n  <span class=\"k\">case<\/span> <span class=\"mi\">2<\/span><span class=\"o\">:<\/span>\r\n      <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"2\u3067\u3059\"<\/span><span class=\"o\">);<\/span>\r\n      <span class=\"k\">break<\/span><span class=\"o\">;<\/span>\r\n  <span class=\"k\">default<\/span><span class=\"o\">:<\/span>\r\n      <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"\u3059\u307f\u307e\u305b\u3093\u3002\u3082\u3046\u4e00\u5ea6\u304a\u9858\u3044\u3057\u307e\u3059\"<\/span><span class=\"o\">);<\/span>\r\n      <span class=\"k\">break<\/span><span class=\"o\">;<\/span>\r\n <span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h3>\u53ef\u4ee5\u4f7f\u7528String\u7c7b\u578b<\/h3>\n<pre class=\"post-pre\"><code><span class=\"nc\">String<\/span> <span class=\"n\">number<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"\u30bc\u30ed\"<\/span><span class=\"o\">;<\/span>\r\n\r\n <span class=\"k\">switch<\/span><span class=\"o\">(<\/span><span class=\"n\">number<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n  <span class=\"k\">case<\/span> <span class=\"s\">\"\u30bc\u30ed\"<\/span><span class=\"o\">:<\/span>\r\n      <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"0\u3067\u3059\"<\/span><span class=\"o\">);<\/span>\r\n      <span class=\"k\">break<\/span><span class=\"o\">;<\/span>\r\n  <span class=\"k\">case<\/span> <span class=\"s\">\"\u30a4\u30c1\"<\/span><span class=\"o\">:<\/span>\r\n      <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"1\u3067\u3059\"<\/span><span class=\"o\">);<\/span>\r\n      <span class=\"k\">break<\/span><span class=\"o\">;<\/span>\r\n  <span class=\"k\">case<\/span> <span class=\"s\">\"\u30cb\"<\/span><span class=\"o\">:<\/span>\r\n      <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"2\u3067\u3059\"<\/span><span class=\"o\">);<\/span>\r\n      <span class=\"k\">break<\/span><span class=\"o\">;<\/span>\r\n  <span class=\"k\">default<\/span><span class=\"o\">:<\/span>\r\n      <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"\u3059\u307f\u307e\u305b\u3093\u3002\u3082\u3046\u4e00\u5ea6\u304a\u9858\u3044\u3057\u307e\u3059\"<\/span><span class=\"o\">);<\/span>\r\n      <span class=\"k\">break<\/span><span class=\"o\">;<\/span>\r\n <span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>\u53ef\u4ee5\u50cf\u6570\u5b57\u4e00\u6837\u4f7f\u7528\u3002<\/p>\n<p>\u5982\u679cString\u7c7b\u578b\u4e3a\u7a7a\u72b6\u6001\uff08\u9664\u4e86\u50cfnumber = &#8220;&#8221;\u6216\u8005number = &#8220;null&#8221;\u8fd9\u6837\u7684\u72b6\u6001\uff09\uff0c\u5373\u5b58\u5728\u79f0\u4e3anull\u7684\u5f02\u5e38\u72b6\u6001\u65f6\uff0c<br \/>\n\u8bf7\u6ce8\u610f\uff0c\u9ed8\u8ba4\u60c5\u51b5\u4e0b\u4e0d\u4f1a\u5bf9\u5176\u8fdb\u884c\u5904\u7406\u3002<br \/>\n\u203b\u867d\u7136\u6211\u4e5f\u4e0d\u592a\u7406\u89e3\uff0c\u4f46\u628a\u5b83\u4f5c\u4e3a\u5907\u5fd8\u5f55\u7559\u4e0b\u6765\u3002<\/p>\n<h2>\u7ed3\u675f<\/h2>\n<p>\u770b\u5230\u5176\u4ed6\u5e16\u5b50\u540e\uff0c\u6211\u610f\u8bc6\u5230\u53ea\u9700\u8981\u6539\u53d8\u7f29\u8fdb\u7b26\u53f7\u4ee5\u53caif\u8bed\u53e5\u548cswitch\u8bed\u53e5\u7684\u7f29\u8fdb\uff0c\u5c31\u80fd\u4f7f\u4ee3\u7801\u66f4\u6613\u8bfb\u3002\u4e5f\u8bb8\u8fd8\u5e94\u8be5\u6ce8\u610f\u76ee\u5f55\u90e8\u5206\u7684 # \u7b26\u53f7\u7684\u6570\u91cf\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u9996\u5148 \u7531\u4e8e\u89e3\u91ca\u590d\u6742\u7684\u90e8\u5206\u4ecd\u7136\u56f0\u96be\uff0c\u56e0\u6b64\u9996\u5148\u9009\u62e9\u8be6\u7ec6\u5730\u63cf\u8ff0\u53ef\u4ee5\u505a\u7684\u57fa\u672c\u4e8b\u9879\u3002 \u6761\u4ef6\u5206\u5c90\u7684\u7f16\u5199\u65b9\u5f0f if(\u6761\u4ef6\u5f0f) [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-31498","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Java \u7684\u6761\u4ef6\u5206\u652f - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, 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