石头剪刀布

import java.util.Random;
import java.util.Scanner;
public class Compar {
    public static void main(String[] args) {
        while (true) {//用于进行未知次数的循环，需要break来跳出
            Scanner in = new Scanner(System.in);
            System.out.println("请输入您要出的数，石头：0，剪刀：1，布：2");
            int user = in.nextInt();
            Random a = new Random();
            int number = a.nextInt(3);
            switch (user) {
                case 0:
                    System.out.println("您输入的是石头");
                    switch (number) {
                        case 0:
                            System.out.println("系统输入为石头，双方平局");
                            break;
                        case 1:
                            System.out.println("系统输入为剪刀，您赢");
                            break;
                        case 2:
                            System.out.println("系统输入为布，系统赢");
                            break;
                    }
                    break;
                case 1:
                    System.out.println("您输入的是剪刀");
                    switch (number) {
                        case 0:
                            System.out.println("系统输入为石头，系统赢");
                            break;
                        case 1:
                            System.out.println("系统输入为剪刀，双方平局");
                            break;
                        case 2:
                            System.out.println("系统输入为布，您赢");
                            break;
                    }
                    break;
                case 2:
                    System.out.println("您输入的是布");
                    switch (number) {
                        case 0:
                            System.out.println("系统输入为石头，您赢");
                            break;
                        case 1:
                            System.out.println("系统输入为剪刀，系统赢");
                            break;
                        case 2:
                            System.out.println("系统输入为布，双方平局");
                            break;
                    }
                    break;
            }
        }
    }
}