猜拳游戏项目（涉及知识点Scanner、Random、For、数组、Break、Continue等）

 1 package day03.d3.xunhuankongzhi;
 2 
 3 import java.util.Scanner;
 4 
 5 public class CaiQuan {
 6 
 7     public static void main(String[] args) {
 8         Scanner sc = new Scanner(System.in);
 9         String[] arr = { "石头", "剪刀", "布" };
10         while (true) {
11             System.err.println("请选择你要出的手势:");
12             int you;
13             for(;;){
14                 you = sc.nextInt();
15                 if(you>=0&&you<3){
16                     System.err.println("你出的是" + arr[you]);
17                     break;
18                 }else{
19                     System.err.println("你出的手势无效,请重新选择你要出的手势！");
20                     continue;
21                 }                
22             }
23             
24             int comp = (int) (Math.random() * 3);
25             System.err.println("电脑出的是:" + arr[comp]);
26             padDuan(you, comp);
27             System.err.println("是否继续下一局(Y/N)：");
28             String str;
29             boolean bool;
30             for (;;) {
31                 str = sc.nextLine();
32                 if (str.equals("Y")) {
33                     bool = true;
34                     break;
35                 } else if (str.equals("N")) {
36                     bool = false;
37                     break;
38                 } else {
39                     System.err.println("输入有误，请重新输入！是否继续下一局(Y/N)：");
40                     continue;
41                 }
42             }
43 
44             if (bool) {
45 
46             } else {
47                 break;
48             }
49 
50         }
51     }
52 
53     public static void padDuan(int x, int y) {
54         if (x == y) {
55             System.err.println("英雄所见略同！");
56         } else if ((x == 0 && y == 1) || (x == 1 && y == 2)
57                 || (x == 2 && y == 0)) {
58             System.err.println("恭喜你，你赢了！");
59         } else {
60             System.err.println("很遗憾，你输了，请再接再厉！");
61         }
62     }
63 }