{"id":94292,"date":"2026-08-14T08:08:51","date_gmt":"2026-08-14T00:08:51","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/94292.html"},"modified":"2026-08-14T08:08:51","modified_gmt":"2026-08-14T00:08:51","slug":"java%e6%95%b0%e7%bb%84","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/94292.html","title":{"rendered":"Java\u6570\u7ec4"},"content":{"rendered":"<p>\u4ec0\u4e48\u662f\u6570\u7ec4&#xff1f;\u7b80\u5355\u6765\u8bf4&#xff0c;\u5b83\u662f\u4e00\u4e2a\u80fd\u591f\u5b58\u50a8\u591a\u4e2a\u6570\u636e\u7684\u7ed3\u6784\u3002\u5728\u4e0d\u540c\u7684\u8bed\u8a00\u4e2d&#xff0c;\u6570\u7ec4\u7684\u5199\u6cd5\u5404\u4e0d\u76f8\u540c&#xff0c;\u672c\u6587\u5c31\u4ee5 Java \u4e3a\u4f8b&#xff0c;\u7b80\u5355\u4ecb\u7ecd\u4e00\u4e0b\u6570\u7ec4\u7684\u57fa\u672c\u5199\u6cd5\u3002 <\/p>\n<h4>Java\u6570\u7ec4<\/h4>\n<ul>\n<li>1. \u683c\u5f0f<\/li>\n<li>2. \u957f\u5ea6<\/li>\n<li>3. \u4e0b\u6807\u4e0e\u8bbf\u95ee\u5143\u7d20<\/li>\n<li>4. \u4e8c\u7ef4\u6570\u7ec4<\/li>\n<li>5. \u5e38\u89c1\u6570\u7ec4\u64cd\u4f5c<\/li>\n<li>6. Java\u6570\u7ec4\u62d3\u5c55\u5de5\u5177<\/li>\n<li>7. \u6bcf\u65e5\u4e00\u5b66-switch\u8bed\u53e5<\/li>\n<\/ul>\n<h2>1. \u683c\u5f0f<\/h2>\n<p>&#xff08;1&#xff09;\u521b\u5efa\u6570\u7ec4\u5e76\u6307\u5b9a\u957f\u5ea6<\/p>\n<p>\u6570\u636e\u7c7b\u578b[] \u6570\u7ec4\u540d &#061; new \u6570\u636e\u7c7b\u578b[\u957f\u5ea6];<\/p>\n<p><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> ages <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">float<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> income <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token keyword\">float<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> names <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>&#xff08;2&#xff09;\u521b\u5efa\u6570\u7ec4\u5e76\u76f4\u63a5\u8d4b\u503c<\/p>\n<p>\u6570\u636e\u7c7b\u578b[] \u6570\u7ec4\u540d &#061; {\u5143\u7d201, \u5143\u7d202, \u5143\u7d203};<\/p>\n<p><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> ages <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">18<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">19<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">float<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> income <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">12.3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">8.9<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">10.4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">7.3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">6.5<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> names <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token string\">&#034;\u5f20\u4e09&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u674e\u56db&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u738b\u4e94&#034;<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h2>2. \u957f\u5ea6<\/h2>\n<p>\u4e00\u4e2a\u6570\u7ec4\u7684\u957f\u5ea6\u8868\u793a\u8fd9\u4e2a\u6570\u7ec4\u53ef\u4ee5\u5b58\u50a8\u591a\u5c11\u4e2a\u5143\u7d20&#xff0c;\u53ef\u4ee5\u901a\u8fc7 \u6570\u7ec4\u540d.length \u6765\u83b7\u5f97\u6570\u7ec4\u7684\u957f\u5ea6\u3002\u4f8b\u5982&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> arr <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> len <span class=\"token operator\">&#061;<\/span> arr<span class=\"token punctuation\">.<\/span>length<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ len\u7684\u503c\u4e3a5&#xff0c;\u5bf9\u5e94arr\u6570\u7ec4\u957f\u5ea6\u4e3a5<\/span><br \/>\n<span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> arr1 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">100<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> len <span class=\"token operator\">&#061;<\/span> arr1<span class=\"token punctuation\">.<\/span>length<span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/ len\u7684\u503c\u4e3a100&#xff0c;\u5bf9\u5e94arr1\u6570\u7ec4\u957f\u5ea6\u4e3a100<\/span><\/p>\n<h2>3. \u4e0b\u6807\u4e0e\u8bbf\u95ee\u5143\u7d20<\/h2>\n<p>&#xff08;1&#xff09;\u4e0b\u6807&#xff1a;\u6570\u7ec4\u4e2d\u7b2c\u4e00\u4e2a\u683c\u5b50\u5bf9\u5e94\u7684\u4e0b\u6807\u662f 0&#xff0c;\u4f9d\u6b21\u9012\u589e 1&#xff0c;\u6700\u540e\u4e00\u4e2a\u4e0b\u6807\u662f \u6570\u7ec4\u540d.length &#8211; 1\u3002<\/p>\n<p>&#xff08;2&#xff09;\u8bbf\u95ee\u5143\u7d20&#xff1a;\u901a\u8fc7 \u6570\u7ec4\u540d[\u4e0b\u6807] \u6765\u8bbf\u95ee\u3002<\/p>\n<ul>\n<li>\u53d6\u51fa&#xff1a;\u6570\u636e\u7c7b\u578b \u53d8\u91cf\u540d &#061; \u6570\u7ec4\u540d[\u4e0b\u6807];<\/li>\n<li>\u5b58\u5165\u3001\u4fee\u6539&#xff1a;\u6570\u7ec4\u540d[\u4e0b\u6807] &#061; \u503c;<\/li>\n<\/ul>\n<p><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> arr <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5b9a\u4e49\u6570\u7ec4<\/span><br \/>\n<span class=\"token keyword\">int<\/span> x <span class=\"token operator\">&#061;<\/span> arr<span class=\"token punctuation\">[<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span>              <span class=\"token comment\">\/\/ \u53d6\u51fa\u4e0b\u6807\u4e3a3\u7684\u5143\u7d20&#xff0c;x\u7684\u503c\u4e3a2<\/span><br \/>\narr<span class=\"token punctuation\">[<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">100<\/span><span class=\"token punctuation\">;<\/span>                <span class=\"token comment\">\/\/ \u4fee\u6539\u4e0b\u6807\u4e3a2\u7684\u5143\u7d20&#xff0c;arr\u53d8\u4e3a{5, 4, 100, 2, 1}<\/span><\/p>\n<p>&#xff08;3&#xff09;\u4f7f\u7528\u5faa\u73af\u6279\u91cf\u64cd\u4f5c&#xff1a;\u901a\u8fc7\u5faa\u73af\u904d\u5386\u4e0b\u6807&#xff0c;\u5373\u53ef\u5bf9\u6570\u7ec4\u8fdb\u884c\u6279\u91cf\u64cd\u4f5c\u3002<\/p>\n<p><span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> arr<span class=\"token punctuation\">.<\/span>length<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>arr<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u4f9d\u6b21\u8f93\u51fa\u6bcf\u4e2a\u5143\u7d20<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h2>4. \u4e8c\u7ef4\u6570\u7ec4<\/h2>\n<p>\u4e8c\u7ef4\u6570\u7ec4\u662f\u4e00\u4e2a\u5b58\u50a8\u4e00\u7ef4\u6570\u7ec4\u7684\u6570\u7ec4&#xff0c;\u53ef\u4ee5\u628a\u5b83\u7406\u89e3\u4e3a\u4e00\u4e2a\u300c\u8868\u683c\u300d&#xff1a;\u5916\u5c42\u4e0b\u6807\u8868\u793a\u884c&#xff0c;\u5185\u5c42\u4e0b\u6807\u8868\u793a\u5217\u3002<\/p>\n<p>&#xff08;1&#xff09;\u683c\u5f0f&#xff1a;<\/p>\n<p>\u6570\u636e\u7c7b\u578b[][] \u6570\u7ec4\u540d &#061; new \u6570\u636e\u7c7b\u578b[\u4e00\u7ef4\u6570\u7ec4\u7684\u4e2a\u6570][\u4e00\u7ef4\u6570\u7ec4\u4e2d\u5143\u7d20\u4e2a\u6570];<\/p>\n<p><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> arr3 <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> n <span class=\"token operator\">&#061;<\/span> arr3<span class=\"token punctuation\">[<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u53d6\u51fa\u7b2c4\u884c\u7b2c3\u5217\u7684\u5143\u7d20&#xff0c;n\u7684\u503c\u4e3a3<\/span><\/p>\n<p>&#xff08;2&#xff09;\u957f\u5ea6&#xff1a;<\/p>\n<ul>\n<li>\u6570\u7ec4\u540d.length&#xff1a;\u8868\u793a\u8fd9\u4e2a\u4e8c\u7ef4\u6570\u7ec4\u53ef\u4ee5\u5b58\u50a8\u591a\u5c11\u4e2a\u4e00\u7ef4\u6570\u7ec4&#xff08;\u5373\u884c\u6570&#xff09;\u3002<\/li>\n<li>\u6570\u7ec4\u540d[0].length&#xff1a;\u8868\u793a\u7b2c\u4e00\u4e2a\u4e00\u7ef4\u6570\u7ec4\u53ef\u4ee5\u5b58\u50a8\u591a\u5c11\u4e2a\u5143\u7d20&#xff08;\u5373\u5217\u6570&#xff09;\u3002<\/li>\n<\/ul>\n<h2>5. \u5e38\u89c1\u6570\u7ec4\u64cd\u4f5c<\/h2>\n<p><span class=\"token keyword\">package<\/span> <span class=\"token class-name\">Frame0808<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Test<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> arr <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">6<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">67<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">7<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">89<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">9<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">123<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5b9a\u4e49\u6570\u7ec4<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ 1. \u6253\u5370\u6240\u6709\u5143\u7d20<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> len <span class=\"token operator\">&#061;<\/span> arr<span class=\"token punctuation\">.<\/span>length<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> len<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> a <span class=\"token operator\">&#061;<\/span> arr<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token operator\">&#043;<\/span><span class=\"token string\">&#034; &#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ 2. \u67e5\u627e\u6700\u5c0f\u503c<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> min <span class=\"token operator\">&#061;<\/span> arr<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5148\u5047\u8bbe\u7b2c\u4e00\u4e2a\u5143\u7d20\u662f\u6700\u5c0f\u503c<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> len<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> a <span class=\"token operator\">&#061;<\/span> arr<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token operator\">&lt;<\/span>min<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span> <span class=\"token comment\">\/\/ \u5982\u679c\u5f53\u524d\u5143\u7d20\u6bd4 min \u8fd8\u5c0f&#xff0c;\u5c31\u66f4\u65b0 min<\/span><br \/>\n                min<span class=\"token operator\">&#061;<\/span>a<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6700\u5c0f\u503c&#xff1a;&#034;<\/span><span class=\"token operator\">&#043;<\/span>min<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ 3. \u6c42\u548c\u5e76\u8ba1\u7b97\u5e73\u5747\u503c<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> sum <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span>i <span class=\"token operator\">&lt;<\/span> len<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            sum<span class=\"token operator\">&#043;&#061;<\/span>i<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u7d2f\u52a0\u4e0b\u6807<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">float<\/span> average <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">float<\/span><span class=\"token punctuation\">)<\/span>sum <span class=\"token operator\">\/<\/span> len<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5f3a\u8f6c\u4e3a float&#xff0c;\u907f\u514d\u6574\u6570\u9664\u6cd5\u4e22\u5931\u5c0f\u6570<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u603b\u548c&#xff1a;&#034;<\/span><span class=\"token operator\">&#043;<\/span>sum<span class=\"token operator\">&#043;<\/span><span class=\"token string\">&#034;&#xff0c;\u5e73\u5747\u503c&#xff1a;&#034;<\/span><span class=\"token operator\">&#043;<\/span>average<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ 4. \u5192\u6ce1\u6392\u5e8f&#xff1a;\u5c06\u6570\u7ec4\u6309\u4ece\u5c0f\u5230\u5927\u6392\u5217<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> b <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u4e34\u65f6\u53d8\u91cf&#xff0c;\u7528\u4e8e\u4ea4\u6362\u4e24\u4e2a\u5143\u7d20<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span>i <span class=\"token operator\">&lt;<\/span> len<span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token comment\">\/\/ \u5916\u5c42\u5faa\u73af\u63a7\u5236\u6bd4\u8f83\u7684\u8f6e\u6570<\/span><br \/>\n            <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> j <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span>j <span class=\"token operator\">&lt;<\/span> len<span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span> j<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token comment\">\/\/ \u5185\u5c42\u5faa\u73af\u8fdb\u884c\u76f8\u90bb\u5143\u7d20\u6bd4\u8f83<\/span><br \/>\n                <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>arr<span class=\"token punctuation\">[<\/span>j<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&gt;<\/span> arr<span class=\"token punctuation\">[<\/span>j<span class=\"token operator\">&#043;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token comment\">\/\/ \u5982\u679c\u524d\u4e00\u4e2a\u6bd4\u540e\u4e00\u4e2a\u5927&#xff0c;\u5c31\u4ea4\u6362<\/span><br \/>\n                    b <span class=\"token operator\">&#061;<\/span> arr<span class=\"token punctuation\">[<\/span>j<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    arr<span class=\"token punctuation\">[<\/span>j<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> arr<span class=\"token punctuation\">[<\/span>j<span class=\"token operator\">&#043;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    arr<span class=\"token punctuation\">[<\/span>j<span class=\"token operator\">&#043;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> b<span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6392\u5e8f\u540e\u7684\u6570\u7ec4&#xff1a;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> len<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> a <span class=\"token operator\">&#061;<\/span> arr<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token operator\">&#043;<\/span><span class=\"token string\">&#034; &#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8f93\u51fa&#xff1a;<\/p>\n<p>3 2 1 4 5 6 67 7 89 9 0 3 3 1 123 1<br \/>\n\u6700\u5c0f\u503c&#xff1a;0<br \/>\n\u603b\u548c&#xff1a;120&#xff0c;\u5e73\u5747\u503c&#xff1a;7.5<br \/>\n\u6392\u5e8f\u540e\u7684\u6570\u7ec4&#xff1a;0 1 1 1 2 3 3 3 4 5 6 7 9 67 89 123 <\/p>\n<h2>6. Java\u6570\u7ec4\u62d3\u5c55\u5de5\u5177<\/h2>\n<p>\u9664\u4e86\u624b\u52a8\u904d\u5386\u6570\u7ec4&#xff0c;Java \u8fd8\u63d0\u4f9b\u4e86 java.util.Arrays \u5de5\u5177\u7c7b&#xff0c;\u5c01\u88c5\u4e86\u5927\u91cf\u5e38\u7528\u65b9\u6cd5&#xff0c;\u53ef\u4ee5\u5e2e\u6211\u4eec\u7701\u53bb\u5f88\u591a\u91cd\u590d\u4ee3\u7801\u3002\u4f7f\u7528\u524d\u5148\u5bfc\u5165\u5305&#xff1a;<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Arrays<\/span><\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>&#xff08;1&#xff09;Arrays.toString(\u6570\u7ec4)&#xff1a;\u6253\u5370\u6570\u7ec4\u5185\u5bb9<\/p>\n<p><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> arr <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toString<\/span><span class=\"token punctuation\">(<\/span>arr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;[1, 2, 3, 4]<\/span><\/p>\n<p>\u4f5c\u7528&#xff1a;\u76f4\u63a5\u628a\u6570\u7ec4\u8f6c\u4e3a\u5b57\u7b26\u4e32\u6253\u5370&#xff0c;\u4e0d\u7528\u81ea\u5df1\u5faa\u73af\u904d\u5386\u3002<\/p>\n<p>&#xff08;2&#xff09;Arrays.sort(\u6570\u7ec4)&#xff1a;\u6570\u7ec4\u4ece\u5c0f\u5230\u5927\u6392\u5e8f<\/p>\n<p><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> arr <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">9<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">sort<\/span><span class=\"token punctuation\">(<\/span>arr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toString<\/span><span class=\"token punctuation\">(<\/span>arr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ [1, 2, 5, 9]<\/span><\/p>\n<p>\u652f\u6301 int\u3001double\u3001String\u3001char \u6570\u7ec4&#xff1b;\u9ed8\u8ba4\u5347\u5e8f&#xff0c;\u57fa\u672c\u7c7b\u578b\u6570\u7ec4\u65e0\u6cd5\u76f4\u63a5\u7b80\u5355\u964d\u5e8f\u3002<\/p>\n<p>&#xff08;3&#xff09;Arrays.binarySearch(\u6570\u7ec4, \u67e5\u627e\u503c)&#xff1a;\u4e8c\u5206\u67e5\u627e<\/p>\n<p>\u524d\u63d0&#xff1a;\u6570\u7ec4\u5fc5\u987b\u5148\u6392\u5e8f&#xff0c;\u5426\u5219\u7ed3\u679c\u9519\u8bef\u3002<\/p>\n<p><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> arr <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> index <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">binarySearch<\/span><span class=\"token punctuation\">(<\/span>arr<span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>index<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8fd4\u56de\u4e0b\u68072<\/span><\/p>\n<p>\u627e\u5230\u8fd4\u56de\u4e0b\u6807&#xff1b;\u6ca1\u627e\u5230\u8fd4\u56de\u8d1f\u6570\u3002<\/p>\n<p>&#xff08;4&#xff09;Arrays.copyOf(\u539f\u6570\u7ec4, \u65b0\u957f\u5ea6)&#xff1a;\u6570\u7ec4\u590d\u5236 &#043; \u6269\u5bb9 \/ \u7f29\u5bb9<\/p>\n<p><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> oldArr <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">30<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> newArr <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">copyOf<\/span><span class=\"token punctuation\">(<\/span>oldArr<span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ newArr &#061; [10, 20, 30, 0, 0]<\/span><\/p>\n<p>\u65b0\u957f\u5ea6 &gt; \u539f\u957f\u5ea6&#xff1a;\u6269\u5bb9&#xff0c;\u591a\u4f59\u4f4d\u7f6e\u9ed8\u8ba4 0 \/ null&#xff1b;\u65b0\u957f\u5ea6 &lt; \u539f\u957f\u5ea6&#xff1a;\u622a\u53d6\u524d\u4e00\u90e8\u5206\u3002<\/p>\n<p>&#xff08;5&#xff09;Arrays.copyOfRange(arr, start, end)&#xff1a;\u533a\u95f4\u622a\u53d6\u6570\u7ec4<\/p>\n<p>\u5de6\u95ed\u53f3\u5f00&#xff1a;\u5305\u542b start&#xff0c;\u4e0d\u5305\u542b end\u3002<\/p>\n<p><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> arr <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> sub <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">copyOfRange<\/span><span class=\"token punctuation\">(<\/span>arr<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ sub &#061; [2, 3, 4]<\/span><\/p>\n<p>&#xff08;6&#xff09;Arrays.fill(\u6570\u7ec4, \u503c)&#xff1a;\u5168\u90e8\u586b\u5145\u7edf\u4e00\u6570\u503c<\/p>\n<p><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> arr <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">fill<\/span><span class=\"token punctuation\">(<\/span>arr<span class=\"token punctuation\">,<\/span> <span class=\"token number\">8<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ arr &#061; [8, 8, 8, 8, 8]<\/span><\/p>\n<p>\u4e5f\u53ef\u4ee5\u533a\u95f4\u586b\u5145&#xff1a;Arrays.fill(arr, 1, 3, 9)\u3002<\/p>\n<p>&#xff08;7&#xff09;Arrays.equals(\u6570\u7ec41, \u6570\u7ec42)&#xff1a;\u5224\u65ad\u4e24\u4e2a\u6570\u7ec4\u5185\u5bb9\u662f\u5426\u5b8c\u5168\u76f8\u7b49<\/p>\n<p><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> b <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">equals<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ true<\/span><\/p>\n<p>\u6ce8\u610f&#xff1a;\u76f4\u63a5 a &#061;&#061; b \u6bd4\u8f83\u7684\u662f\u5730\u5740&#xff0c;\u4e0d\u662f\u5185\u5bb9&#xff01;\u5fc5\u987b\u7528 equals\u3002<\/p>\n<h2>7. \u6bcf\u65e5\u4e00\u5b66-switch\u8bed\u53e5<\/h2>\n<p>switch \u8bed\u53e5\u7528\u4e8e\u591a\u5206\u652f\u5224\u65ad&#xff0c;\u6839\u636e\u4e00\u4e2a\u8868\u8fbe\u5f0f\u7684\u503c&#xff0c;\u5339\u914d\u5bf9\u5e94\u7684 case \u5206\u652f\u6267\u884c\u3002\u76f8\u6bd4\u591a\u4e2a if-else&#xff0c;switch \u7ed3\u6784\u66f4\u6e05\u6670\u3001\u53ef\u8bfb\u6027\u66f4\u9ad8\u3002<\/p>\n<p>\u57fa\u672c\u683c\u5f0f&#xff1a;<\/p>\n<p><span class=\"token keyword\">switch<\/span> <span class=\"token punctuation\">(<\/span>\u8868\u8fbe\u5f0f<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> \u503c<span class=\"token number\">1<\/span><span class=\"token operator\">:<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u503c1 \u5bf9\u5e94\u7684\u4ee3\u7801<\/span><br \/>\n        <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> \u503c<span class=\"token number\">2<\/span><span class=\"token operator\">:<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u503c2 \u5bf9\u5e94\u7684\u4ee3\u7801<\/span><br \/>\n        <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">default<\/span><span class=\"token operator\">:<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u6240\u6709 case \u90fd\u4e0d\u5339\u914d\u65f6\u6267\u884c<\/span><br \/>\n        <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u6838\u5fc3\u8981\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u8868\u8fbe\u5f0f \u7684\u7c7b\u578b\u53ef\u4ee5\u662f int\u3001char\u3001String\u7b49&#xff0c;\u4e0d\u80fd\u662f long\u3001float\u3001double\u3002<\/li>\n<li>\u6bcf\u4e2a case \u540e\u9762\u5fc5\u987b\u662f\u5e38\u91cf&#xff0c;\u4e0d\u80fd\u662f\u53d8\u91cf\u6216\u8868\u8fbe\u5f0f\u3002<\/li>\n<li>break \u7528\u4e8e\u8df3\u51fa switch&#xff1b;\u6f0f\u5199 break \u4f1a\u53d1\u751f\u300c\u7a7f\u900f\u300d&#xff0c;\u7ee7\u7eed\u6267\u884c\u4e0b\u4e00\u4e2a case&#xff0c;\u76f4\u5230\u9047\u5230 break \u6216\u7ed3\u675f\u3002<\/li>\n<li>default \u53ef\u9009&#xff0c;\u653e\u5728\u6700\u540e&#xff0c;\u8868\u793a\u6240\u6709 case \u90fd\u4e0d\u5339\u914d\u65f6\u6267\u884c\u3002<\/li>\n<\/ul>\n<p>\u793a\u4f8b&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> day <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">switch<\/span> <span class=\"token punctuation\">(<\/span>day<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> <span class=\"token number\">1<\/span><span class=\"token operator\">:<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u661f\u671f\u4e00&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> <span class=\"token number\">2<\/span><span class=\"token operator\">:<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u661f\u671f\u4e8c&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> <span class=\"token number\">3<\/span><span class=\"token operator\">:<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u661f\u671f\u4e09&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">default<\/span><span class=\"token operator\">:<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5176\u4ed6&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;\u661f\u671f\u4e09<\/span><\/p>\n<p>\u7a7f\u900f\u793a\u4f8b&#xff08;\u6f0f\u5199 break&#xff09;&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> score <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">85<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">switch<\/span> <span class=\"token punctuation\">(<\/span>score <span class=\"token operator\">\/<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> <span class=\"token number\">10<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> <span class=\"token number\">9<\/span><span class=\"token operator\">:<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u4f18\u79c0&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> <span class=\"token number\">8<\/span><span class=\"token operator\">:<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u826f\u597d&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">default<\/span><span class=\"token operator\">:<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u7ee7\u7eed\u52a0\u6cb9&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;\u826f\u597d<\/span><br \/>\n<span class=\"token comment\">\/\/      \u7ee7\u7eed\u52a0\u6cb9<\/span><br \/>\n<span class=\"token comment\">\/\/ \u8bf4\u660e&#xff1a;score&#061;85 \u65f6 score\/10&#061;8&#xff0c;\u5339\u914d case 8 \u8f93\u51fa&#034;\u826f\u597d&#034;&#xff1b;<\/span><br \/>\n<span class=\"token comment\">\/\/       \u4f46 case 8 \u6f0f\u5199 break&#xff0c;\u7ee7\u7eed\u7a7f\u900f\u5230 default \u53c8\u8f93\u51fa&#034;\u7ee7\u7eed\u52a0\u6cb9&#034;\u3002<\/span><br \/>\n<span class=\"token comment\">\/\/       \u8fd9\u5c31\u662f\u300c\u7a7f\u900f\u300d&#xff1a;\u6f0f\u5199 break \u4f1a\u7ee7\u7eed\u5f80\u4e0b\u6267\u884c&#xff0c;\u76f4\u5230\u9047\u5230 break \u6216 switch \u7ed3\u675f\u3002<\/span><\/p>\n<p>\u5de7\u5999\u8fd0\u7528\u7a7f\u900f&#xff1a;\u5224\u65ad\u6708\u4efd\u5c5e\u4e8e\u54ea\u4e2a\u5b63\u8282<\/p>\n<p><span class=\"token keyword\">int<\/span> month <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">switch<\/span> <span class=\"token punctuation\">(<\/span>month<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> <span class=\"token number\">12<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> <span class=\"token number\">1<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> <span class=\"token number\">2<\/span><span class=\"token operator\">:<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u51ac\u5b63&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> <span class=\"token number\">3<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> <span class=\"token number\">4<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> <span class=\"token number\">5<\/span><span class=\"token operator\">:<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6625\u5b63&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> <span class=\"token number\">6<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> <span class=\"token number\">7<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> <span class=\"token number\">8<\/span><span class=\"token operator\">:<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u590f\u5b63&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> <span class=\"token number\">9<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> <span class=\"token number\">10<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> <span class=\"token number\">11<\/span><span class=\"token operator\">:<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u79cb\u5b63&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">default<\/span><span class=\"token operator\">:<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u65e0\u6548\u6708\u4efd&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;\u6625\u5b63<\/span><\/p>\n<p>\u8fd9\u91cc\u628a\u76f8\u90bb\u7684 3 \u4e2a\u6708\u4efd\u8fde\u7eed\u5199\u5728\u4e00\u8d77&#xff0c;\u7701\u7565\u4e2d\u95f4\u7684 break&#xff0c;\u8ba9\u5b83\u4eec\u7a7f\u900f\u5230\u540c\u4e00\u4e2a\u8f93\u51fa\u5206\u652f&#xff0c;\u4ee3\u7801\u6bd4\u5199 12 \u4e2a if-else \u7b80\u6d01\u5f97\u591a\u3002<\/p>\n<p>\u5c0f\u6280\u5de7&#xff1a;\u591a\u4e2a case \u5171\u7528\u540c\u4e00\u6bb5\u4ee3\u7801\u65f6&#xff0c;\u53ef\u4ee5\u50cf\u4e0a\u9762\u8fd9\u6837\u8fde\u7eed\u5199\u591a\u4e2a case&#xff0c;\u5229\u7528\u7a7f\u900f\u7279\u6027\u5408\u5e76\u5206\u652f\u3002<\/p>\n<p>\u5176\u5b9e case \u8fd8\u6709\u4e00\u79cd\u66f4\u4e3a\u7b80\u4fbf\u7684\u5199\u6cd5&#xff1a;case \u503c -&gt; \u7ed3\u679c&#xff0c;\u5373 switch \u7bad\u5934\u8bed\u6cd5&#xff08;Java 14 \u53ca\u4ee5\u4e0a\u7248\u672c\u652f\u6301&#xff09;\u3002<\/p>\n<p>\u7bad\u5934\u8bed\u6cd5\u683c\u5f0f&#xff1a;<\/p>\n<p><span class=\"token keyword\">switch<\/span> <span class=\"token punctuation\">(<\/span>\u8868\u8fbe\u5f0f<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> \u503c<span class=\"token number\">1<\/span> <span class=\"token operator\">-&gt;<\/span> \u7ed3\u679c<span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> \u503c<span class=\"token number\">2<\/span> <span class=\"token operator\">-&gt;<\/span> \u7ed3\u679c<span class=\"token number\">2<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">default<\/span> <span class=\"token operator\">-&gt;<\/span> \u9ed8\u8ba4\u7ed3\u679c<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u4f7f\u7528 -&gt; \u540e\u4e0d\u9700\u8981\u518d\u5199 break&#xff0c;\u6bcf\u4e2a\u5206\u652f\u6267\u884c\u5b8c\u4f1a\u81ea\u52a8\u8df3\u51fa switch&#xff0c;\u800c\u4e14\u4e0d\u4f1a\u53d1\u751f\u7a7f\u900f\u3002\u4e0a\u9762\u7684\u201c\u5224\u65ad\u6708\u4efd\u5c5e\u4e8e\u54ea\u4e2a\u5b63\u8282\u201d\u53ef\u4ee5\u7b80\u5316\u6210&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> month <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">String<\/span> season <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">switch<\/span> <span class=\"token punctuation\">(<\/span>month<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> <span class=\"token number\">12<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token string\">&#034;\u51ac\u5b63&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token string\">&#034;\u6625\u5b63&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> <span class=\"token number\">6<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">7<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">8<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token string\">&#034;\u590f\u5b63&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> <span class=\"token number\">9<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">11<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token string\">&#034;\u79cb\u5b63&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">default<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token string\">&#034;\u65e0\u6548\u6708\u4efd&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>season<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;\u6625\u5b63<\/span><\/p>\n<p>\u8bf4\u660e&#xff1a;\u591a\u4e2a\u503c\u53ef\u4ee5\u5199\u5728\u4e00\u4e2a case \u91cc&#xff0c;\u7528\u9017\u53f7\u9694\u5f00&#xff1b;\u7bad\u5934\u540e\u9762\u76f4\u63a5\u5199\u8981\u8fd4\u56de\u7684\u7ed3\u679c&#xff0c;\u4e5f\u5c31\u662f case \u503c -&gt; \u7ed3\u679c&#xff0c;\u518d\u628a\u6574\u4e2a switch \u7684\u7ed3\u679c\u7528 &#061; \u8d4b\u503c\u7ed9\u53d8\u91cf\u5373\u53ef&#xff0c;\u4ee3\u7801\u66f4\u7b80\u6d01\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4ec0\u4e48\u662f\u6570\u7ec4&#xff1f;\u7b80\u5355\u6765\u8bf4&#xff0c;\u5b83\u662f\u4e00\u4e2a\u80fd\u591f\u5b58\u50a8\u591a\u4e2a\u6570\u636e\u7684\u7ed3\u6784\u3002\u5728\u4e0d\u540c\u7684\u8bed\u8a00\u4e2d&#xff0c;\u6570\u7ec4\u7684\u5199\u6cd5\u5404\u4e0d\u76f8\u540c&#xff0c;\u672c\u6587\u5c31\u4ee5 Java \u4e3a\u4f8b&#xff0c;\u7b80\u5355\u4ecb\u7ecd\u4e00\u4e0b\u6570\u7ec4\u7684\u57fa\u672c\u5199\u6cd5\u3002 Java\u6570\u7ec41. \u683c\u5f0f2. \u957f\u5ea63. 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