用户类   

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import java.util.Scanner;
 
public class User {
    String name;
    int choice;
 
    public int user() {
        Scanner input = new Scanner(System.in);
        System.out.print("请出拳: 1.剪刀 2.石头 3.布 (输入相应的数字):");
        choice = input.nextInt();
        switch (choice) {
        case 1:
            name = "用户出拳:剪刀";
            break;
        case 2:
            name = "用户出拳:石头";
            break;
        case 3:
            name = "用户出拳:布";
            break;
        default:
            System.out.println("输入有误!\t请重新输入:");
            user();
            break;
        }
        System.out.println(name);
        return (choice);
    }
}

电脑类

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public class Computer {
    String name;
    int random;
    public int Computer(){
        random=(int)(Math.random()*3+1);
        switch (random) {
        case 1:
            name="出拳:剪刀";
            break;
        case 2:
            name="出拳:石头";
            break;
        case 3:
            name="出拳:布";
            break;
        }
        return (random);
    }
}

对战类

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import java.util.Scanner;
 
public class Duel {
    Scanner input = new Scanner(System.in);
    User user = new User();
    Computer computer = new Computer();
    String username, Computer, Computername;
    int userchoice, count1, count2, count3, count4;
 
    public void Start() {
        System.out.println("\t**************************"
                + "\n\t****    猜拳  , 开始          ****"
                + "\n\t**************************");
        System.out.println("------------------------------------------");
        System.out.println("出拳规则: 1.剪刀 2.石头 3.布");
        System.out.print("请选择对方角色(1.刘备 2.孙权 3.曹操):");
        userchoice = input.nextInt();
        switch (userchoice) {
        case 1:
            Computer = "您选择了,刘备对战";
            Computername = "刘备";
            break;
        case 2:
            Computer = "您选择了,孙权对战";
            Computername = "孙权";
            break;
        case 3:
            Computer = "您选择了,曹操对战";
            Computername = "曹操";
            break;
        default:
            System.out.println("输入有误!\t请重新输入:");
            Start();
        }
        System.out.println(Computer);
        System.out.print("请输入您的昵称:");
        username = input.next();
        System.out.println(username + " vs " + Computername);
        System.out.print("是否开始游戏(y / n):");
        String choice = input.next();
        if (choice.equals("y")) {
            Test();
        } else if (choice.equals("n")) {
            System.out.println("谢谢使用!再见!");
        } else {
            System.out.println("输入错误!程序异常!");
            System.exit(0);
        }
    }
 
    public void Test() {
        System.out.println("------------------------------------------");
        user.user();
        computer.Computer();
        System.out.println(Computername + computer.name);
        if (user.choice == computer.random) {
            System.out.println("结果:和局 ,真衰(-__-)!");
            count1++;
        } else if (user.choice == 1 && computer.random == 2 || user.choice == 2
                && computer.random == 3 || user.choice == 3
                && computer.random == 1) {
            System.out.println("结果:( ^_^ ),你输了,真笨!");
            count2++;
        } else {
            System.out.println("结果: (︶︿︶),你赢了,再来一把啊!");
            count3++;
        }
        count4++;
        System.out.println("------------------------------------------");
        System.out.print("\n小伙伴!想不想在玩一次! ^_^ (y / n):");
        String choice = input.next();
        if (choice.equals("y")) {
            Test();
        } else if (choice.equals("n")) {
            End();
        } else {
            System.out.println("输入错误!程序异常!");
            System.exit(0);
        }
    }
 
    public void End() {
        System.out.println("------------------------------------------");
        System.out.println(username + " vs " + Computername);
        System.out.println("对战次数:" + count4);
        System.out.println("平局次数:" + count1);
        System.out.println("\n昵称\t分数");
        System.out.println(username + "\t" + count3);
        System.out.println(Computername + "\t" + count2);
        if (count3 == count2) {
            System.out.println("\n结果:打成平手,下次再和你一分高下!(-__-)");
        } else if (count3 > count2) {
            System.out.println("\n结果:呵呵,有点不服,下次记得在来!(︶︿︶)");
        } else {
            System.out.println("\n结果:( ^_^ )呵呵!笨笨,下次加油哦");
        }
        System.out.println("------------------------------------------");
        System.exit(0);
    }
}

测试类

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public class Test {
 
    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Duel duel = new Duel();
        duel.Start();
    }
}