Java如何实现人机猜拳游戏

public class User 
{
 private String name;
 private int score=0;
 private int num;
 public String GetName()
 {
 return this.name;
 }
 public void SetName(String name)
 {
 this.name=name;
 }
 public int GetScore()
 {
 return this.score;
 }
 public void SetScore(int score)
 {
 this.score+=score;
 }
 
}

public class Computer 
{
 private String name;
 private int score=0;
 private int num;
 public String GetName()
 {
 return this.name;
 }
 public void SetName(String name)
 {
 this.name=name;
 }
 
 public int RandNums()
 {
 int n;
 n=(int)(Math.random()*3)+1;// 返回1到3的随机整数。 
 return n;
 }
 public int GetScore()
 {
 return this.score;
 }
 public void SetScore(int score)
 {
 this.score+=score;
 }
}

import java.util.Scanner;
 
public class GameManager 
{
 
 
 
 public static void main(String[] args) 
 {
 Scanner input=new Scanner(System.in);//创建一个键盘扫描类对象
 User user=new User();
 Computer computer=new Computer();
 int vsNums=0;
 System.out.println("出拳游戏规则：1、剪刀，2、石头，3、布");
 System.out.println("请选择对方角色(1、刘备，2、孙权，3、曹操)");
 int n=input.nextInt(); //输入整型
 switch(n)
 {
 case 1:
 computer.SetName("刘备");
 break;
 case 2:
 computer.SetName("孙权");
 break;
 case 3:
 computer.SetName("曹操");
 break;
 }
 System.out.println("请输入你的姓名");
 String name=input.next(); //输入字符串型
 user.SetName(name);
 System.out.println(user.GetName()+" "+"VS"+" "+computer.GetName());
 
 String flag="y";
 while(flag.equals(flag))
 {
 System.out.println("要开始吗y/n");
 String yOrn=input.next(); //输入字符串型
 if(yOrn.equals("y"))
 {
 vsNums++;
 System.out.println("请出拳：1、剪刀，2、石头，3、布（输入数字）");
 int nums=input.nextInt(); //输入整型
 switch(nums)
 {
 case 1:
  System.out.println("你出拳："+"剪刀");
  break;
 case 2:
  System.out.println("你出拳："+"石头");
  break;
 case 3:
  System.out.println("你出拳："+"布");
  break;
 }
 int rand=computer.RandNums();
 switch(rand)
 {
 case 1:
  System.out.println(computer.GetName()+"出拳："+"剪刀");
  break;
 case 2:
  System.out.println(computer.GetName()+"出拳："+"石头");
  break;
 case 3:
  System.out.println(computer.GetName()+"出拳："+"布");
  break;
 }
 if(nums==1 && rand==3 || nums==2 && rand==1 || nums==3 && rand==2)
 {
  System.out.println("恭喜，你赢了");
  user.SetScore(1);
 }
 else if(nums==rand)
 {
  System.out.println("平手了");
 }
 else
 {
  System.out.println("很遗憾，你输了");
  computer.SetScore(1);
 }
 
 }
 else
 {
 System.out.println(computer.GetName()+" "+"VS"+" "+user.GetName());
 System.out.println("对战次数："+vsNums);
 System.out.println("姓名\t得分");
 System.out.println(user.GetName()+"\t"+user.GetScore());
 System.out.println(computer.GetName()+"\t"+computer.GetScore());
 if(user.GetScore()>computer.GetScore())
 {
  System.out.println("恭喜，恭喜");
 }
 else
 {
  System.out.println("继续加油");
 }
 break;
 }
 }
 
 
 }
}