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

package day03.d3.xunhuankongzhi;

import java.util.Scanner;

public class CaiQuan {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String[] arr = { "石头", "剪刀", "布" };
        while (true) {
            System.err.println("请选择你要出的手势:");
            int you;
            for(;;){
                you = sc.nextInt();
                if(you>=0&&you<3){
                    System.err.println("你出的是" + arr[you]);
                    break;
                }else{
                    System.err.println("你出的手势无效,请重新选择你要出的手势！");
                    continue;
                }                
            }
            
            int comp = (int) (Math.random() * 3);
            System.err.println("电脑出的是:" + arr[comp]);
            padDuan(you, comp);
            System.err.println("是否继续下一局(Y/N)：");
            String str;
            boolean bool;
            for (;;) {
                str = sc.nextLine();
                if (str.equals("Y")) {
                    bool = true;
                    break;
                } else if (str.equals("N")) {
                    bool = false;
                    break;
                } else {
                    System.err.println("输入有误，请重新输入！是否继续下一局(Y/N)：");
                    continue;
                }
            }

            if (bool) {

            } else {
                break;
            }

        }
    }

    public static void padDuan(int x, int y) {
        if (x == y) {
            System.err.println("英雄所见略同！");
        } else if ((x == 0 && y == 1) || (x == 1 && y == 2)
                || (x == 2 && y == 0)) {
            System.err.println("恭喜你，你赢了！");
        } else {
            System.err.println("很遗憾，你输了，请再接再厉！");
        }
    }
}