{"id":58141,"date":"2025-08-16T03:00:15","date_gmt":"2025-08-15T19:00:15","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/58141.html"},"modified":"2025-08-16T03:00:15","modified_gmt":"2025-08-15T19:00:15","slug":"javase%e6%96%b9%e6%b3%95%e7%9a%84%e4%bd%bf%e7%94%a8%e5%8f%8a%e9%80%92%e5%bd%92","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/58141.html","title":{"rendered":"JavaSE:\u65b9\u6cd5\u7684\u4f7f\u7528\u53ca\u9012\u5f52"},"content":{"rendered":"

\u4e00\u3001\u65b9\u6cd5\u6982\u5ff5\u53ca\u4f7f\u7528<\/h2>\n

\u65b9\u6cd5\u5c31\u662f\u4e00\u4e2a\u4ee3\u7801\u7247\u6bb5. \u7c7b\u4f3c\u4e8e C \u8bed\u8a00\u4e2d\u7684 "\u51fd\u6570"\u3002<\/p>\n

\u65b9\u6cd5\u7684\u5b9a\u4e49<\/h3>\n

\u8bed\u6cd5\u683c\u5f0f<\/h4>\n

\/\/ \u65b9\u6cd5\u5b9a\u4e49
\n\u4fee\u9970\u7b26 \u8fd4\u56de\u503c\u7c7b\u578b \u65b9\u6cd5\u540d\u79f0([\u53c2\u6570\u7c7b\u578b \u5f62\u53c2 …]){
\n \u65b9\u6cd5\u4f53\u4ee3\u7801;
\n [return \u8fd4\u56de\u503c];
\n}<\/p>\n

\u4f8b\u5982：\u5199\u4e00\u4e2a\u65b9\u6cd5\u5b9e\u73b0\u5224\u65ad\u662f\u5426\u4e3a\u95f0\u5e74<\/p>\n

public class Test{
\n public static void main(String[] args){
\n int year = 2008;
\n boolean ret = isLeapYear(year);
\n if(ret == true){
\n System.out.println("\u662f\u95f0\u5e74!");
\n }else{
\n System.out.println("\u4e0d\u662f\u95f0\u5e74!");
\n }
\n }
\n public static boolean isLeapYear(int year){
\n if(year % 4 == 0 && year %100 != 0 || year % 400 == 0){
\n return true;
\n }
\n return false;
\n }
\n}<\/p>\n

\u3010\u6ce8\u610f\u4e8b\u9879\u3011<\/h4>\n
  • \u4fee\u9970\u7b26：\u73b0\u9636\u6bb5\u76f4\u63a5\u4f7f\u7528public static<\/span> \u56fa\u5b9a\u642d\u914d<\/li>\n
  • \u8fd4\u56de\u503c\u7c7b\u578b：\u5982\u679c\u65b9\u6cd5\u6709\u8fd4\u56de\u503c，\u8fd4\u56de\u503c\u7c7b\u578b\u5fc5\u987b\u8981\u4e0e\u8fd4\u56de\u7684\u5b9e\u4f53\u7c7b\u578b\u4e00\u81f4，\u5982\u679c\u6ca1\u6709\u8fd4\u56de\u503c，\u5fc5\u987b\u5199\u6210 void<\/span><\/li>\n
  • \u65b9\u6cd5\u540d\u5b57：\u91c7\u7528\u5c0f\u9a7c\u5cf0\u547d\u540d<\/li>\n
  • \u53c2\u6570\u5217\u8868：\u5982\u679c\u65b9\u6cd5\u6ca1\u6709\u53c2\u6570，()\u4e2d\u4ec0\u4e48\u90fd\u4e0d\u5199，\u5982\u679c\u6709\u53c2\u6570，\u9700\u6307\u5b9a\u53c2\u6570\u7c7b\u578b，\u591a\u4e2a\u53c2\u6570\u4e4b\u95f4\u4f7f\u7528\u9017\u53f7\u9694\u5f00<\/li>\n
  • \u65b9\u6cd5\u4f53：\u65b9\u6cd5\u5185\u90e8\u8981\u6267\u884c\u7684\u8bed\u53e5<\/li>\n
  • \u5728java\u5f53\u4e2d，\u65b9\u6cd5\u5fc5\u987b\u5199\u5728\u7c7b\u5f53\u4e2d<\/li>\n
  • \u5728java\u5f53\u4e2d，\u65b9\u6cd5\u4e0d\u80fd\u5d4c\u5957\u5b9a\u4e49<\/li>\n
  • \u5728java\u5f53\u4e2d，\u6ca1\u6709\u65b9\u6cd5\u58f0\u660e\u4e00\u8bf4<\/li>\n

    \u65b9\u6cd5\u8c03\u7528\u7684\u6267\u884c\u8fc7\u7a0b<\/h3>\n

    \u8c03\u7528\u65b9\u6cd5—>\u4f20\u9012\u53c2\u6570—>\u627e\u5230\u65b9\u6cd5\u5730\u5740—>\u6267\u884c\u88ab\u8c03\u65b9\u6cd5\u7684\u65b9\u6cd5\u4f53—>\u88ab\u8c03\u65b9\u6cd5\u7ed3\u675f\u8fd4\u56de—>\u56de\u5230\u4e3b\u8c03\u65b9\u6cd5\u7ee7\u7eed\u5f80\u4e0b\u6267\u884c<\/p>\n

    \u3010\u6ce8\u610f\u4e8b\u9879\u3011<\/h4>\n
      \n
    • \u5b9a\u4e49\u65b9\u6cd5\u7684\u65f6\u5019, \u4e0d\u4f1a\u6267\u884c\u65b9\u6cd5\u7684\u4ee3\u7801. \u53ea\u6709\u8c03\u7528\u7684\u65f6\u5019\u624d\u4f1a\u6267\u884c.<\/li>\n
    • \u4e00\u4e2a\u65b9\u6cd5\u53ef\u4ee5\u88ab\u591a\u6b21\u8c03\u7528.<\/li>\n<\/ul>\n

      \u5b9e\u53c2\u4e0e\u5f62\u53c2\u7684\u5173\u7cfb<\/h3>\n

      \u5728Java \u4e2d\u7684\u5f62\u53c2\u548c\u5b9e\u53c2\u4e0e C\u8bed\u8a00\u7684\u7c7b\u4f3c<\/p>\n

      \u6211\u4eec\u5728\u8c03\u7528\u65b9\u6cd5\u7684\u65f6\u5019，\u4f20\u9012\u7684\u53c2\u6570\u5c31\u662f\u5b9e\u53c2<\/span>，\u5b83\u662f\u4e00\u4e2a\u786e\u5b9a\u7684\u503c;\u800c\u88ab\u8c03\u7528\u7684\u65b9\u6cd5\u7684\u62ec\u53f7\u5185\u5c31\u662f\u5f62\u53c2<\/span>，<\/span>\u5f62\u53c2\u7684\u540d\u5b57\u53ef\u4ee5\u968f\u610f\u53d6，\u5bf9\u65b9\u6cd5\u90fd\u6ca1\u6709\u4efb\u4f55\u5f71\u54cd，\u5f62\u53c2\u53ea\u662f\u65b9\u6cd5\u5728\u5b9a\u4e49\u65f6\u9700\u8981\u501f\u52a9\u7684\u4e00\u4e2a\u53d8\u91cf，\u7528\u6765\u4fdd\u5b58\u65b9\u6cd5\u5728\u8c03\u7528\u65f6\u4f20\u9012\u8fc7\u6765\u7684\u5b9e\u53c2，\u65b9\u6cd5\u8c03\u7528\u7ed3\u675f\u540e，\u5f62\u53c2\u5c31\u4f1a\u88ab\u56de\u6536<\/p>\n

      \u4f8b\u5982：<\/p>\n

      public static void main(String[] args){<\/p>\n

      getSum(10); \/\/ 10\u662f\u5b9e\u53c2,\u5728\u65b9\u6cd5\u8c03\u7528\u65f6，\u5f62\u53c2N\u7528\u6765\u4fdd\u5b5810
      \n getSum(100);\/\/ 100\u662f\u5b9e\u53c2，\u5728\u65b9\u6cd5\u8c03\u7528\u65f6，\u5f62\u53c2N\u7528\u6765\u4fdd\u5b58100
      \n}
      \npublic static int getSum(int N){ \u00a0 \/\/ N\u662f\u5f62\u53c2
      \n \u00a0 \u00a0return (1+N)*N \/ 2;
      \n}
      \n\/\/\u53c8\u6bd4\u5982：
      \nadd(2, 3); \u00a0 \/\/ 2\u548c3\u662f\u5b9e\u53c2，\u5728\u8c03\u7528\u65f6\u4f20\u7ed9\u5f62\u53c2a\u548cb<\/p>\n

      public static int add(int a, int b){
      \n \u00a0 \u00a0return a + b;
      \n}<\/p>\n

      \u6ce8\u610f：<\/p>\n

      \u5728Java\u4e2d，\u5b9e\u53c2\u7684\u503c\u6c38\u8fdc\u90fd\u662f\u62f7\u8d1d\u5230\u5f62\u53c2\u4e2d，\u5f62\u53c2\u548c\u5b9e\u53c2\u672c\u8d28\u662f\u4e24\u4e2a\u5b9e\u4f53<\/p>\n

      \u4f8b\u5982：\u5b9e\u73b0\u4e24\u4e2a\u6574\u578b\u53d8\u91cf\u7684\u4ea4\u6362<\/p>\n

      public class TestMethod {
      \n public static void main(String[] args) {
      \n int a = 10;
      \n int b = 20;
      \n swap(a, b);
      \n System.out.println("main: a = " + a + " b = " + b);
      \n }<\/p>\n

      public static void swap(int x, int y) {
      \n int tmp = x;
      \n x = y;
      \n y = tmp;
      \n \u00a0 \u00a0 System.out.println("swap: x = " + x + " y = " + y);
      \n }
      \n}<\/p>\n

      \u4f46\u662f，\u5728swap\u51fd\u6570\u4ea4\u6362\u4e4b\u540e，\u5f62\u53c2x\u548cy\u7684\u503c\u53d1\u751f\u4e86\u6539\u53d8，\u4f46\u662fmain\u65b9\u6cd5\u4e2da\u548cb\u8fd8\u662f\u4ea4\u6362\u4e4b\u524d\u7684\u503c，\u5373\u6ca1\u6709\u4ea4\u6362\u6210\u529f<\/p>\n

      \/\/ \u8fd0\u884c\u7ed3\u679c<\/p>\n

      swap: x = 20 y = 10<\/p>\n

      main: a = 10 b = 20<\/p>\n

      \u3010\u539f\u56e0\u5206\u6790\u3011<\/p>\n

      \u5b9e\u53c2a\u548cb\u662fmain\u65b9\u6cd5\u4e2d\u7684\u4e24\u4e2a\u53d8\u91cf，\u5176\u7a7a\u95f4\u5728main\u65b9\u6cd5\u7684\u6808(\u4e00\u5757\u7279\u6b8a\u7684\u5185\u5b58\u7a7a\u95f4)\u4e2d，\u800c\u5f62\u53c2x\u548cy\u662fswap\u65b9\u6cd5\u4e2d \u7684\u4e24\u4e2a\u53d8\u91cf，x\u548cy\u7684\u7a7a\u95f4\u5728swap\u65b9\u6cd5\u8fd0\u884c\u65f6\u7684\u6808\u4e2d<\/p>\n

      \u56e0\u6b64：\u5b9e\u53c2a\u548cb \u4e0e \u5f62\u53c2x\u548cy\u662f\u4e24\u4e2a\u6ca1\u6709\u4efb\u4f55\u5173\u8054\u6027\u7684\u53d8\u91cf， \u5728swap\u65b9\u6cd5\u8c03\u7528\u65f6，\u53ea\u662f\u5c06\u5b9e\u53c2a\u548cb\u4e2d\u7684\u503c\u62f7\u8d1d\u4e86\u4e00\u4efd\u4f20\u9012\u7ed9\u4e86\u5f62\u53c2x\u548cy，\u56e0\u6b64\u5bf9\u5f62\u53c2x\u548cy\u64cd\u4f5c\u4e0d\u4f1a\u5bf9\u5b9e\u53c2a\u548cb \u4ea7\u751f\u4efb\u4f55\u5f71\u54cd<\/p>\n

      \u5373\u5bf9\u4e8e\u57fa\u7840\u7c7b\u578b<\/span>\u6765\u8bf4, \u5f62\u53c2\u7684\u6539\u53d8\u4e0d\u4f1a\u5f71\u54cd\u5b9e\u53c2，\u5f62\u53c2\u76f8\u5f53\u4e8e\u5b9e\u53c2\u7684\u62f7\u8d1d. \u5373 <\/span>\u4f20\u503c\u8c03\u7528<\/span><\/p>\n

      \u90a3\u4e48\u6309\u7167C\u8bed\u8a00\u7684\u89e3\u51b3\u65b9\u5f0f：\u5c31\u662f \u4f20\u5740\u8c03\u7528<\/span>\u00a0，\u5728\u7ed9\u51fd\u6570\u4f20\u53c2\u7684\u65f6\u5019，\u4f20\u5730\u5740&，\u7136\u540e\u7528\u6307\u9488\u53d8\u91cf\u6765\u63a5\u6536（\u901a\u8fc7&\u53d6\u5730\u5740\u64cd\u4f5c\u6765\u6539\u53d8\u5b9e\u53c2\u7684\u503c）<\/p>\n

      \u4f46\u662f，\u5728Java\u5f53\u4e2d\u662f\u62ff\u4e0d\u5230\u6808\u4e0a\u7684\u5c40\u90e8\u53d8\u91cf\u7684\u5730\u5740\u7684，\u4e5f\u6ca1\u6709\u6307\u9488\u7684\u6982\u5ff5<\/p>\n

      \"\"<\/p>\n

      \u3010\u89e3\u51b3\u529e\u6cd5\u3011: \u4f20\u5f15\u7528\u7c7b\u578b\u53c2\u6570<\/span> (\u5305\u62ec\u5b57\u7b26\u4e32\u548c\u6570\u7ec4，\u4f8b\u5982\u6570\u7ec4\u6765\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898)<\/p>\n

      （\u6b64\u4ee3\u7801\u7b49\u5b66\u4e60\u5b8c\u6570\u7ec4\u5c31\u80fd\u770b\u61c2）<\/p>\n

      public class TestMethod {
      \n public static void main(String[] args) {
      \n int[] arr = {10, 20};
      \n swap(arr);
      \n System.out.println("arr[0] = " + arr[0] + " arr[1] = " + arr[1]);<\/p>\n

      }<\/p>\n

      public static void swap(int[] arr) {
      \n int tmp = arr[0];
      \n arr[0] = arr[1];
      \n arr[1] = tmp;
      \n }
      \n}<\/p>\n

      \/\/ \u8fd0\u884c\u7ed3\u679c<\/p>\n

      arr[0] = 20 arr[1] = 10<\/p>\n

      \u6ca1\u6709\u8fd4\u56de\u503c\u7684\u65b9\u6cd5<\/h3>\n

      \u65b9\u6cd5\u7684\u8fd4\u56de\u503c\u662f\u53ef\u9009\u7684. \u6709\u4e9b\u65f6\u5019\u53ef\u4ee5\u6ca1\u6709\u7684，\u6ca1\u6709\u65f6\u8fd4\u56de\u503c \u7c7b\u578b\u5fc5\u987b\u5199\u6210void<\/span><\/p>\n

      \u793a\u4f8b：<\/span><\/p>\n

      public class Test {
      \n public static void main(String[] args) {
      \n int a = 10; int b = 20; print(a, b);
      \n } <\/p>\n

      public static void print(int x, int y) {
      \n System.out.println("x = " + x + " y = " + y);
      \n }
      \n}<\/p>\n

      \u53e6\u5916，\u4e0a\u9762\u7684\u4ea4\u6362\u4e24\u4e2a\u6574\u6570\u7684\u65b9\u6cd5,\u5c31\u662f\u6ca1\u6709 \u8fd4 \u56de \u503c \u7684<\/p>\n

      \u4e8c\u3001\u65b9\u6cd5\u91cd\u8f7d<\/h2>\n

      \u4e3a\u4ec0\u4e48\u9700\u8981\u65b9\u6cd5\u91cd\u8f7d<\/h3>\n

      \u5f53\u6211\u4eec\u60f3\u8981\u5199\u4e00\u4e2a\u65b9\u6cd5\u5b9e\u73b0\u4e24\u4e2a\u6570\u7684\u76f8\u52a0：<\/p>\n

      public static int add(int a,int b){
      \n return a+b;
      \n }
      \n public static void main5(String[] args) {
      \n int x = 1;
      \n int y = 2;
      \n int ret = add(x,y);<\/p>\n

      double d1 = 1.0;
      \n double d2 = 2.0;
      \n double ret1 = add(d1,d2);
      \n System.out.println(ret1);
      \n }<\/p>\n

      \u8fd0\u884c\u8d77\u6765\u65f6，\u53d1\u73b0\u62a5\u9519\u4e86：<\/p>\n

      \/\/ \u7f16\u8bd1\u51fa\u9519<\/p>\n

      Test.java:13: \u9519\u8bef: \u4e0d\u517c\u5bb9\u7684\u7c7b\u578b: \u4ecedouble\u8f6c\u6362\u5230int\u53ef\u80fd\u4f1a\u6709\u635f\u5931 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/p>\n

      double ret2 = add (a2,b2) ;<\/p>\n

      \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0^<\/p>\n

      \u7531\u4e8e\u53c2\u6570\u7c7b\u578b\u4e0d\u5339\u914d，\u6240\u4ee5\u4e0d\u80fd\u76f4\u63a5\u4f7f\u7528\u73b0\u6709\u7684 add \u65b9\u6cd5<\/p>\n

      \u4e00\u822c\u89e3\u51b3\u65b9\u5f0f\u90fd\u662f\u6bcf\u4e2a\u7c7b\u578b\u521b\u5efa\u4e00\u4e2a\u65b9\u6cd5\u5e76\u53d6\u4e00\u4e2a\u4e13\u95e8\u7684\u65b9\u6cd5\u540d：<\/p>\n

      public static void main5(String[] args) {
      \n int x = 1;
      \n int y = 2;
      \n int ret = addInt(x,y);
      \n System.out.println(ret);<\/p>\n

      double d1 = 1.0;
      \n double d2 = 2.0;
      \n double ret1 = addDouble(d1,d2);
      \n System.out.println(ret1);
      \n }
      \n public static int addInt(int a,int b){
      \n return a+b;
      \n }
      \n public static double addDouble(double a,double b){
      \n return a+b;
      \n }<\/p>\n

      \u4e0a\u8ff0\u4ee3\u7801\u786e\u5b9e\u53ef\u4ee5\u89e3\u51b3\u95ee\u9898，\u4f46\u4e0d\u53cb\u597d\u7684\u5730\u65b9\u662f：\u9700\u8981\u63d0\u4f9b\u8bb8\u591a\u4e0d\u540c\u7684\u65b9\u6cd5\u540d，\u800c\u53d6\u540d\u5b57\u672c\u6765\u5c31\u662f\u8ba9\u4eba\u5934\u75bc\u7684\u4e8b\u60c5\u3002\u90a3\u80fd\u5426\u5c06\u6240\u6709\u7684\u540d\u5b57\u90fd\u7ed9\u6210 add \u5462？<\/p>\n

      \u65b9\u6cd5\u91cd\u8f7d\u6982\u5ff5<\/h3>\n

      \u5728\u81ea\u7136\u8bed\u8a00\u4e2d，\u7ecf\u5e38\u4f1a\u51fa\u73b0\u201c\u4e00\u8bcd\u591a\u4e49\u201d\u7684\u73b0\u8c61，\u6bd4\u5982，\u201c\u65b9\u4fbf\u201d，\u53ef\u4ee5\u8868\u793a\u5185\u6025，\u8868\u793a\u65b9\u4fbf\u9762\u7b49<\/p>\n

      \u4e00\u4e2a\u8bcd\u8bed\u5982\u679c\u6709\u591a\u91cd\u542b\u4e49，\u90a3\u4e48\u5c31\u8bf4\u8be5\u8bcd\u8bed\u88ab\u91cd\u8f7d\u4e86，\u5177\u4f53\u4ee3\u8868\u4ec0\u4e48\u542b\u4e49\u9700\u8981\u7ed3\u5408\u5177\u4f53\u7684\u573a\u666f\u3002 \u5728Java\u4e2d\u65b9\u6cd5\u4e5f\u662f\u53ef\u4ee5\u91cd\u8f7d\u7684\u3002<\/p>\n

      \u5728Java\u4e2d，\u5982\u679c\u591a\u4e2a\u65b9\u6cd5\u7684\u540d\u5b57\u76f8\u540c<\/span>，\u53c2\u6570\u5217\u8868\u4e0d\u540c<\/span>，\u5219\u79f0\u8be5\u51e0\u79cd\u65b9\u6cd5\u88ab\u91cd\u8f7d\u4e86<\/p>\n

      public class Test{
      \n public static void main(String[] args){
      \n int a = 10;
      \n int b = 20;
      \n int ret = add(a,b); \/\/\u8c03\u7528add(int, int)
      \n System.out.println(ret);<\/p>\n

      double d1 = 1.0;
      \n double d2 = 2.0;
      \n double ret1 = add(d1,d2);\/\/\u8c03\u7528add(double, double)
      \n System.out.println(ret1);
      \n }<\/p>\n

      public static int add(int a, int b){
      \n return a+b;
      \n }
      \n public static double add(double a, double c){
      \n return a+b;
      \n }
      \n}<\/p>\n

      \u5f53\u6211\u4eec\u5199\u5b8cadd\u65b9\u6cd5\u4e0d\u540c\u7c7b\u578b\u65f6，\u6bcf\u6b21\u6211\u4eec\u60f3\u8981\u8c03\u7528add\u65b9\u6cd5，\u5c31\u4f1a\u6d6e\u73b0add\u7684\u65b9\u6cd5\u91cd\u8f7d：<\/p>\n

      \"\"<\/p>\n

      \u6ce8\u610f<\/span>：\u91cd\u8f7d\u7684\u6761\u4ef6<\/h4>\n
    • \u65b9\u6cd5\u540d\u5fc5\u987b\u76f8\u540c<\/li>\n
    • \u00a0\u53c2\u6570\u5217\u8868\u5fc5\u987b\u4e0d\u540c(\u53c2\u6570\u4e2a\u6570\u4e0d\u540c\u00a0\/\u00a0\u53c2\u6570\u7c7b\u578b\u4e0d\u540c\u00a0\/\u00a0\u7c7b\u578b\u987a\u5e8f\u4e0d\u540c–>\u5fc5\u987b\u662f\u4e0d\u540c\u7c7b\u578b\u7684\u987a\u5e8f\u4e0d\u540c)<\/li>\n
    • \u4e0e\u8fd4\u56de\u503c\u7c7b\u578b\u662f\u5426\u76f8\u540c\u65e0\u5173<\/li>\n
    • \u7f16\u8bd1\u5668\u5728\u7f16\u8bd1\u4ee3\u7801\u65f6，\u4f1a\u5bf9\u5b9e\u53c2\u7c7b\u578b\u8fdb\u884c\u63a8\u6f14，\u6839\u636e\u63a8\u6f14\u7684\u7ed3\u679c\u6765\u786e\u5b9a\u8c03\u7528\u54ea\u4e2a\u65b9\u6cd5<\/li>\n

      \"\"<\/p>\n

      \u6ce8\u610f：\u4e24\u4e2a\u65b9\u6cd5\u5982\u679c\u4ec5\u4ec5\u53ea\u662f\u56e0\u4e3a\u8fd4\u56de\u503c\u7c7b\u578b\u4e0d\u540c，\u662f\u4e0d\u80fd\u6784\u6210\u91cd\u8f7d\u7684<\/h4>\n

      \"\"<\/p>\n

      \u6ce8\u610f:\u53c2\u6570\u5217\u8868\u7684\u7c7b\u578b\u987a\u5e8f\u4e0d\u540c\u5fc5\u987b\u662f\u4e0d\u540c\u7c7b\u578b\u7684\u53c2\u6570\u987a\u5e8f\u4e0d\u540c，\u5426\u5219\u4f1a\u62a5\u9519<\/h4>\n

      \"\"<\/p>\n

      \u65b9\u6cd5\u7b7e\u540d<\/h3>\n

      \u5728\u540c\u4e00\u4e2a\u4f5c\u7528\u57df\u4e2d\u4e0d\u80fd\u5b9a\u4e49\u4e24\u4e2a\u76f8\u540c\u540d\u79f0\u7684\u6807\u8bc6\u7b26\u3002\u6bd4\u5982：\u65b9\u6cd5\u4e2d\u4e0d\u80fd\u5b9a\u4e49\u4e24\u4e2a\u540d\u5b57\u4e00\u6837\u7684\u53d8\u91cf，\u90a3\u4e3a\u4ec0\u4e48\u7c7b\u4e2d\u5c31\u53ef\u4ee5\u5b9a\u4e49\u65b9\u6cd5\u540d\u76f8\u540c\u7684\u65b9\u6cd5\u5462？（\u5373\u65b9\u6cd5\u91cd\u8f7d\u5b9e\u73b0\u65b9\u5f0f）\u2014\u2014\u00a0\u901a\u8fc7\u65b9\u6cd5\u7b7e\u540d<\/span>\u5b9e\u73b0<\/p>\n

      \u65b9\u6cd5\u7b7e\u540d\u5373：\u7ecf\u8fc7\u7f16\u8bd1\u5668\u7f16\u8bd1\u4fee\u6539\u8fc7\u4e4b\u540e\u65b9\u6cd5\u6700\u7ec8\u7684\u540d\u5b57\u3002<\/p>\n

      \u5177\u4f53\u65b9\u5f0f：\u65b9\u6cd5\u5168\u8def\u5f84\u540d+\u53c2\u6570\u5217\u8868+\u8fd4\u56de\u503c\u7c7b\u578b，\u6784\u6210\u65b9\u6cd5\u5b8c\u6574\u7684\u540d\u5b57\u3002<\/p>\n

      \u65b9\u6cd5\u7b7e\u540d\u7684\u5173\u952e\u8981\u7d20：<\/h4>\n
    • \u65b9\u6cd5\u540d<\/li>\n
    • \u53c2\u6570\u5217\u8868（\u53c2\u6570\u7c7b\u578b\u3001\u987a\u5e8f\u3001\u6570\u91cf\/\u4e2a\u6570）<\/li>\n

      \u4f8b\u5982\u4ee5\u4e0b\u7684\u4ee3\u7801：<\/p>\n

      public class TestMethod {
      \n \u00a0 \u00a0public static int add(int x, int y){
      \n \u00a0 \u00a0 \u00a0 \u00a0return x + y;
      \n \u00a0 }<\/p>\n

      \u00a0 \u00a0public static double add(double x, double y){
      \n \u00a0 \u00a0 \u00a0 \u00a0return x + y;
      \n \u00a0 }<\/p>\n

      \u00a0 \u00a0public static void main(String[] args) {
      \n \u00a0 \u00a0 \u00a0 \u00a0add(1,2);
      \n \u00a0 \u00a0 \u00a0 \u00a0add(1.5, 2.5);
      \n \u00a0 }
      \n}<\/p>\n

      \u4e0a\u8ff0\u4ee3\u7801\u7ecf\u8fc7\u7f16\u8bd1\u4e4b\u540e，\u7136\u540e\u4f7f\u7528JDK\u81ea\u5e26\u7684javap\u53cd\u6c47\u7f16\u5de5\u5177\u67e5\u770b，\u5177\u4f53\u64cd\u4f5c：<\/p>\n

    • \u5148\u5bf9\u5de5\u7a0b\u8fdb\u884c\u7f16\u8bd1\u751f\u6210.class\u5b57\u8282\u7801\u6587\u4ef6<\/li>\n
    • \u5728\u63a7\u5236\u53f0\u4e2d\u8fdb\u5165\u5230\u8981\u67e5\u770b\u7684.class\u6240\u5728\u7684\u76ee\u5f55<\/li>\n
    • \u8f93\u5165：javap -v \u5b57\u8282\u7801\u6587\u4ef6\u540d\u5b57\u5373\u53ef<\/li>\n

      \"\"<\/p>\n

      \"\"<\/p>\n

      \"\"<\/p>\n

      \u4ee5\u6574\u578b\u7c7b\u578b\u4e3a\u4f8b：<\/p>\n

      \"\"<\/p>\n

      \u603b\u7ed3<\/h4>\n

      \u65b9\u6cd5\u91cd\u8f7d\u7684\u5b9e\u73b0\u662f\u7f16\u8bd1\u5668\u901a\u8fc7\u65b9\u6cd5\u7b7e\u540d\u751f\u6210\u552f\u4e00\u7684\u65b9\u6cd5\u6807\u8bc6\u7b26<\/p>\n\n\n\n\n\n\n\n
      add(int a, int b) \u2192 \u7f16\u8bd1\u4e3a add(II)I<\/td>\n<\/tr>\n
      II = \u4e24\u4e2aint\u53c2\u6570<\/td>\n<\/tr>\n
      I = \u8fd4\u56deint\u7c7b\u578b<\/td>\n<\/tr>\n
      add(double a, double b) \u2192 \u7f16\u8bd1\u4e3a add(DD)D<\/td>\n<\/tr>\n
      add(int a, int b, int c) \u2192 \u7f16\u8bd1\u4e3a add(III)I<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      \u65b9\u6cd5\u7b7e\u540d\u4e2d\u7684\u4e00\u4e9b\u7279\u6b8a\u7b26\u53f7\u8bf4\u660e：<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
      \u7279\u6b8a\u5b57\u7b26<\/td>\n\u6570\u636e\u7c7b\u578b<\/td>\n<\/tr>\n
      V<\/td>\nvoid<\/td>\n<\/tr>\n
      Z<\/td>\nboolean<\/td>\n<\/tr>\n
      B<\/td>\nbyte<\/td>\n<\/tr>\n
      C<\/td>\nchar<\/td>\n<\/tr>\n
      S<\/td>\nshort<\/td>\n<\/tr>\n
      I<\/td>\nint<\/td>\n<\/tr>\n
      J<\/td>\nlong<\/td>\n<\/tr>\n
      F<\/td>\nfloat<\/td>\n<\/tr>\n
      D<\/td>\ndouble<\/td>\n<\/tr>\n
      [<\/td>\n\u6570\u7ec4(\u4ee5 [ \u5f00\u5934，\u914d\u5408\u5176\u4ed6\u7684\u7279\u6b8a\u5b57\u7b26，\u8868\u8ff0\u5bf9\u5e94\u6570\u636e\u7c7b\u578b\u7684\u6570\u7ec4，\u51e0\u4e2a [ \u8868\u8ff0\u51e0\u7ef4\u6570\u7ec4)<\/td>\n<\/tr>\n
      L<\/td>\n\u5f15\u7528\u7c7b\u578b，\u4ee5L\u5f00\u5934，\u4ee5 ; \u7ed3\u5c3e，\u4e2d\u95f4\u662f\u5f15\u7528\u7c7b\u578b\u7684\u5168\u7c7b\u540d<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      \u4e09\u3001\u9012\u5f52<\/h2>\n

      \u4e00\u4e2a\u65b9\u6cd5\u5728\u6267\u884c\u8fc7\u7a0b\u4e2d\u8c03\u7528\u81ea\u8eab, \u5c31\u79f0\u4e3a "\u9012\u5f52".<\/p>\n

      \u9012\u5f52\u76f8\u5f53\u4e8e\u6570\u5b66\u4e0a\u7684 "\u6570\u5b66\u5f52\u7eb3\u6cd5", \u6709\u4e00\u4e2a\u8d77\u59cb\u6761\u4ef6<\/span>, \u7136\u540e\u6709\u4e00\u4e2a\u9012\u63a8\u516c\u5f0f<\/span>.<\/p>\n

      \u4f8b\u5982, \u6211\u4eec\u6c42 N!<\/p>\n

      \u8d77\u59cb\u6761\u4ef6: N = 1 \u7684\u65f6\u5019, N! \u4e3a 1. \u8fd9\u4e2a\u8d77\u59cb\u6761\u4ef6\u76f8\u5f53\u4e8e\u9012\u5f52\u7684\u7ed3\u675f\u6761\u4ef6<\/span>.<\/p>\n

      \u9012\u5f52\u516c\u5f0f: \u6c42 N! , \u76f4\u63a5\u4e0d\u597d\u6c42, \u53ef\u4ee5\u628a\u95ee\u9898\u8f6c\u6362\u6210 N! => N * (N-1)!<\/p>\n

      \u9012\u5f52\u7684\u5fc5\u8981\u6761\u4ef6：<\/p>\n

    • \u5c06\u539f\u95ee\u9898\u5212\u5206\u6210\u5176\u5b50\u95ee\u9898，\u6ce8\u610f：\u5b50\u95ee\u9898\u5fc5\u987b\u8981\u4e0e\u539f\u95ee\u9898\u7684\u89e3\u6cd5\u76f8\u540c<\/li>\n
    • \u9012\u5f52\u51fa\u53e3<\/li>\n

      \u9012\u5f52\u6267\u884c\u8fc7\u7a0b\u5206\u6790<\/h3>\n

      \u9012\u5f52\u7684\u7a0b\u5e8f\u7684\u6267\u884c\u8fc7\u7a0b\u4e0d\u592a\u5bb9\u6613\u7406\u89e3, \u8981\u60f3\u7406\u89e3\u6e05\u695a\u9012\u5f52, \u5fc5\u987b\u5148\u7406\u89e3\u6e05\u695a "\u65b9\u6cd5\u7684\u6267\u884c\u8fc7\u7a0b", \u5c24\u5176\u662f "\u65b9\u6cd5\u6267\u884c\u7ed3\u675f \u4e4b\u540e, \u56de\u5230\u8c03\u7528\u4f4d\u7f6e\u7ee7\u7eed\u5f80\u4e0b\u6267\u884c".<\/p>\n

      \u4ee3\u7801\u793a\u4f8b：\u9012\u5f52\u6c42 N \u7684\u9636\u4e58<\/h5>\n

      public static void main(String[] args){
      \n int n = 5;
      \n int ret = factor(n);
      \n System.out.println("ret=" + ret);
      \n}<\/p>\n

      public static int factor(int n){
      \n System.out.println("\u51fd\u6570\u5f00\u59cb, n = " + n);
      \n if(n == 1){
      \n System.out.println("\u51fd\u6570\u7ed3\u675f, n = 1 ret = 1");
      \n return 1;
      \n }
      \n int ret = n * factor(n-1); \/\/ factor \u8c03\u7528\u51fd\u6570\u81ea\u8eab
      \n System.out.println("\u51fd\u6570\u7ed3\u675f, n = " + n + " ret = " + ret);
      \n return ret;
      \n}<\/p>\n

      \/\/ \u6267\u884c\u7ed3\u679c<\/p>\n

      \u51fd\u6570\u5f00\u59cb, n = 5<\/p>\n

      \u51fd\u6570\u5f00\u59cb, n = 4<\/p>\n

      \u51fd\u6570\u5f00\u59cb, n = 3<\/p>\n

      \u51fd\u6570\u5f00\u59cb, n = 2<\/p>\n

      \u51fd\u6570\u5f00\u59cb, n = 1<\/p>\n

      \u51fd\u6570\u7ed3\u675f, n = 1 ret = 1<\/p>\n

      \u51fd\u6570\u7ed3\u675f, n = 2 ret = 2<\/p>\n

      \u51fd\u6570\u7ed3\u675f, n = 3 ret = 6<\/p>\n

      \u51fd\u6570\u7ed3\u675f, n = 4 ret = 24<\/p>\n

      \u51fd\u6570\u7ed3\u675f, n = 5 ret = 120<\/p>\n

      ret = 120<\/p>\n

      \u6267\u884c\u8fc7\u7a0b\u56fe<\/h5>\n

      \"\"<\/p>\n

      \u7a0b\u5e8f\u6309\u7167\u5e8f\u53f7\u4e2d\u6807\u8bc6\u7684 (1) -> (8) \u7684\u987a\u5e8f\u6267\u884c<\/p>\n

      \u5173\u4e8e "\u8c03\u7528\u6808"<\/h4>\n

      \u65b9\u6cd5\u8c03\u7528\u7684\u65f6\u5019, \u4f1a\u6709\u4e00\u4e2a "\u6808" \u8fd9\u6837\u7684\u5185\u5b58\u7a7a\u95f4\u63cf\u8ff0\u5f53\u524d\u7684\u8c03\u7528\u5173\u7cfb. \u79f0\u4e3a\u8c03\u7528\u6808. \u6bcf\u4e00\u6b21\u7684\u65b9\u6cd5\u8c03\u7528\u5c31\u79f0\u4e3a\u4e00\u4e2a "\u6808\u5e27", \u6bcf\u4e2a\u6808\u5e27\u4e2d\u5305\u542b\u4e86\u8fd9\u6b21\u8c03\u7528\u7684\u53c2\u6570\u662f\u54ea\u4e9b, \u8fd4\u56de\u5230\u54ea\u91cc\u7ee7\u7eed\u6267\u884c\u7b49\u4fe1\u606f.<\/p>\n

      \u9012\u5f52\u7684\u7ec3\u4e60<\/h3>\n

      \u6309\u987a\u5e8f\u6253\u5370\u4e00\u4e2a\u6570\u5b57\u7684\u6bcf\u4e00\u4f4d<\/h3>\n

      \u4f8b\u5982 1234 \u6253\u5370\u51fa 1 2 3 4<\/p>\n

      \u601d\u8def：\u4f7f\u7528 \/10 ，%10 \u7684\u65b9\u6cd5<\/p>\n

      \u7ed3\u675f\u6761\u4ef6（\u5373\u8d77\u59cb\u6761\u4ef6）：n < 10(\u5f53n\u5c0f\u4e8e10\u7684\u65f6\u5019，\u4efb\u4f55\u6570\u5b57 \/10 \u90fd\u662f\u5b83\u672c\u8eab，\u76f4\u63a5\u6253\u5370\u5373\u53ef)<\/p>\n

      \u9012\u63a8\u516c\u5f0f：print(n \/\u00a010)\u00a0 ,\u00a0 \u00a0n %10\u00a0\u00a0<\/p>\n

      \"\"<\/p>\n

      public static void main(String[] args){
      \n System.out.println(print(1234));
      \n}<\/p>\n

      public static void print(int n){
      \n if(n < 10){
      \n System.out.println(n);
      \n return;
      \n }
      \n print(n \/ 10);
      \n System.out.println(n % 10);
      \n}<\/p>\n

      \u6267\u884c\u8fc7\u7a0b：<\/p>\n

      \"\"<\/p>\n

      \u9012\u5f52\u6c42 1 + 2 + 3 + … + 10<\/h3>\n

      \u601d\u8def：\u6c421+\u523010 ——> \u5c31\u662f\u00a01+2+3+\u2026\u2026+n\u00a0 \u7684\u95ee\u9898，\u5373 \u6211\u4eec\u53ef\u4ee5\u5229\u7528\u516c\u5f0f n + (n-1) \u6765\u6c42\u89e3<\/p>\n

      \u7ed3\u675f\u6761\u4ef6：n == 0（n == 1）<\/p>\n

      \u9012\u63a8\u516c\u5f0f：n + sum(n-1)<\/p>\n

      public static void main(String[] args){
      \n System.out.println(sum(10));
      \n}<\/p>\n

      public static int sum(int n){
      \n if(n == 0){
      \n return 0;
      \n }
      \n return n + sum(n-1);\/\/55
      \n}<\/p>\n

      \u6267\u884c\u8fc7\u7a0b：<\/p>\n

      \"\"<\/p>\n

      \u5199\u4e00\u4e2a\u9012\u5f52\u65b9\u6cd5，\u8f93\u5165\u4e00\u4e2a\u975e\u8d1f\u6574\u6570，\u8fd4\u56de\u7ec4\u6210\u5b83\u7684\u6570\u5b57\u4e4b\u548c<\/h3>\n

      \u4f8b\u5982，\u8f93\u5165 1729, \u5219\u5e94\u8be5\u8fd4\u56de 1+7+2+9，\u5b83\u7684\u548c\u662f19<\/p>\n

      \u601d\u8def：\/10\u00a0 ，%10<\/p>\n

      \u7ed3\u675f\u6761\u4ef6：n < 10<\/p>\n

      \u9012\u63a8\u516c\u5f0f：fun(n \/10) + n % 10<\/p>\n

      public static void main(String[] args){
      \n System.out.println(fun(1729));
      \n}<\/p>\n

      public static int fun(int n){
      \n if(n < 10){
      \n return n;
      \n }
      \n return fun(n\/10)+n%10;
      \n}<\/p>\n

      \u6267\u884c\u8fc7\u7a0b：
      \n\"\"<\/p>\n

      \u6c42\u6590\u6ce2\u90a3\u5951\u6570\u5217\u7684\u7b2c N \u9879<\/h3>\n

      \u6590\u6ce2\u90a3\u5951\u6570\u5217，\u53c8\u79f0\u9ec4\u91d1\u5206\u5272\u6570\u5217<\/p>\n

      \u6590\u6ce2\u90a3\u5951\u6570\u5217\u6307\u7684\u662f\u8fd9\u6837\u4e00\u4e2a\u6570\u5217：<\/p>\n

      \"\"<\/p>\n

      \u8fd9\u4e2a\u6570\u5217\u4ece\u7b2c3\u9879\u5f00\u59cb，\u6bcf\u4e00\u9879\u90fd\u7b49\u4e8e\u524d\u4e24\u9879\u4e4b\u548c<\/p>\n

      \u6590\u6ce2\u90a3\u5951\u6570\u5217\u88ab\u4ee5\u9012\u63a8\u7684\u65b9\u6cd5\u5b9a\u4e49：F(0)=0，F(1)=1, F(n)=F(n – 1)+F(n – 2)<\/p>\n

      \u9012\u63a8\u6c42\u6590\u6ce2\u90a3\u5951\u6570\u5217\u7684\u7b2cN\u9879<\/h4>\n

      \u7ed3\u675f\u6761\u4ef6：n < 3<\/p>\n

      \u9012\u63a8\u516c\u5f0f：fib(n – 1) + fib(n – 2)<\/p>\n

      public static void main(String[] args){<\/p>\n

      System.out.println(fib(1));\/\/1
      \n System.out.println(fib(5));\/\/5
      \n System.out.println(fib(10));\/\/55
      \n System.out.println(fib(40));\/\/102334155
      \n}<\/p>\n

      public static int fib(int n){
      \n if(n == 1 || n == 2){
      \n return 1;
      \n }
      \n return fib(n-1)+fib(n-2);
      \n}<\/p>\n

      \u6267\u884c\u8fc7\u7a0b：<\/p>\n

      \"\"<\/p>\n

      \u9012\u5f52\u8fc7\u7a0b\u62c6\u89e3（\u4ece\u9876\u5c42\u5411\u4e0b\u8ba1\u7b97）：<\/p>\n

    • \u8ba1\u7b97 F (5)，\u9700\u5148\u6c42 F (4) \u548c F (3)<\/li>\n
    • \u8ba1\u7b97 F (4)，\u9700\u5148\u6c42 F (3) \u548c F (2)<\/li>\n
    • F (2) \u662f\u57fa\u7840\u6761\u4ef6，\u76f4\u63a5\u8fd4\u56de 1<\/li>\n
    • \u8ba1\u7b97 F (3)（F (4) \u7684\u5de6\u5206\u652f），\u9700\u5148\u6c42 F (2) \u548c F (1)<\/li>\n
    • F (2)=1，F (1)=1，\u56e0\u6b64 F (3)=1+1=2<\/li>\n
    • \u6b64\u65f6 F (4) = F (3) + F (2) = 2 + 1 = 3<\/li>\n
    • \u8ba1\u7b97 F (3)（F (5) \u7684\u53f3\u5206\u652f），\u540c\u7406\u5f97 F (3)=2（\u4e0e\u6b65\u9aa4 3 \u7ed3\u679c\u76f8\u540c）<\/li>\n
    • \u6700\u540e F (5) = F (4) + F (3) = 3 + 2 = 5<\/li>\n

      (\u5f53\u8ba1\u7b97\u5b8c\u5de6\u5206\u652f\u540e，\u518d\u8ba1\u7b97\u53f3\u5206\u652f)<\/p>\n

      \u6700\u7ec8\u7ed3\u679c：\u6590\u6ce2\u90a3\u5951\u6570\u5217\u7b2c\u4e94\u9879\u4e3a 5<\/p>\n

      \u6211\u4eec\u770b\u56fe\u53ef\u4ee5\u77e5\u9053，\u5176\u5b9e\u4f7f\u7528\u9012\u5f52\u6c42\u6590\u6ce2\u90a3\u5951\u6570\u5217\u6548\u7387\u5e76\u4e0d\u9ad8，\u56e0\u4e3a\u5b83\u5728\u9012\u5f52\u7684\u8fc7\u7a0b\u6709\u8bb8\u591a\u91cd\u590d\u7684\u5730\u65b9（\u91cd\u590d\u8ba1\u7b97\u4e86F(3),F(2),F(1)），\u4f7f\u7528\u5faa\u73af\u6c42\u89e3\u66f4\u9ad8\u6548<\/p>\n

      \u5faa\u73af\u6c42\u6590\u6ce2\u90a3\u5951\u6570\u5217\u7684\u7b2cN\u9879<\/h4>\n

      \u601d\u8def：\u5728 fib \u65b9\u6cd5\u5185\u521b\u5efa\u4e09\u4e2a\u53d8\u91cff1,f2,f3，\u8868\u793a\u7b2cn-1\u9879，\u7b2cn\u9879，\u7b2cn+1\u9879，\u7ed9\u5b83\u4eec\u521d\u59cb\u5316\u90fd\u4e3a1<\/p>\n

      \u4f7f\u7528for\u5faa\u73af\u904d\u5386，\u521d\u59cb\u503c\u8bbe\u4e3ai=3,\u5373\u5982\u679cn\u6ee1\u8db3\u6b64\u6761\u4ef6\u5373\u53ef\u8fdb\u5165\u5faa\u73af，\u8fdb\u884c\u524d\u4e24\u9879\u76f8\u52a0\u7b49\u4e8e\u7b2cn\u9879\u7684\u503cf3，\u6c42\u5b8c\u540e\u5c06\u539f\u672c\u7684f2\u8d4b\u503c\u7ed9f1，f3\u8d4b\u503c\u7ed9f2，\u4ee5\u4fbf\u8fdb\u884c\u4e0b\u4e00\u6b21\u5faa\u73af，\u6700\u540e\u8fd4\u56def3；\u5982\u679c\u4e0d\u6ee1\u8db3\u5faa\u73af\u6761\u4ef6，\u5219\u76f4\u63a5\u8fd4\u56def3\u521d\u59cb\u5316\u7684\u503c（\u5373n\u662f\u7b2c1\/2\u9879）<\/p>\n

      public static void main(String[] args){<\/p>\n

      System.out.println(fib(1));\/\/1
      \n System.out.println(fib(5));\/\/5
      \n System.out.println(fib(10));\/\/55
      \n System.out.println(fib(40));\/\/102334155
      \n}<\/p>\n

      public static int fib(int n){
      \n int f1 = 1;
      \n int f2 = 1;
      \n int f3 = 1;
      \n for(int i = 3;i <= n; i++){
      \n f3 = f1 + f2;
      \n f1 = f2;
      \n f2 = f3;
      \n }
      \n return f3;
      \n}<\/p>\n","protected":false},"excerpt":{"rendered":"

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