猜拳

int a=0;
		Scanner s=new Scanner(System.in);
		System.out.println("--------------猜拳游戏---------------");
		System.out.println(" ");
		System.out.println(" ");

		while(a>=0) {
			System.out.println("请出拳:1、石头 2、剪刀 3、布");
			int x=s.nextInt();
			Random on=new Random();
			int y=on.nextInt(3)+1;
		
		if(x>=4||x==0)
		    {

			System.out.println("亲,请正确输入"); 

			}
		else
		{  
			if(x==y)
			{  

			if(x==1)
			{ 
            a++;
			System.out.println("石头------电脑:石头    PK:很幸运打平手");
			System.out.println(" ");
			System.out.println(" ");
			}
			else if(x==2)
			    {
                a++;
				System.out.println("剪刀------电脑:剪刀   PK:很幸运打平手");
				System.out.println(" ");
				System.out.println(" ");
				

				}else 
				{
                a++;
				System.out.println("布------电脑:布    PK:很幸运打平手");
				System.out.println(" ");
				System.out.println(" ");
				

				}
			}
			else if(x==1&&y==2||x==2&&y==3||x==3&&y==1){ 

			if(x==1&&y==2)
			{
            a++;
			System.out.println("石头------电脑:剪刀    PK:恭喜您,赢了!");
			System.out.println(" ");
			System.out.println(" ");
			

			}else if(x==2&&y==3)
			{
            a++;
			System.out.println("剪刀------电脑:布   PK:恭喜您,赢了!");
			System.out.println(" ");
			System.out.println(" ");
			

			}else 
			{
				a++;
				System.out.println("布------电脑:石头    PK:恭喜您,赢了!");
				System.out.println(" ");
				System.out.println(" ");
				
			}
		}
			else{

				if(x==1&&y==3)
				{
                a++;
				System.out.println("石头------电脑:布    PK:很遗憾,输了!");
				System.out.println(" ");
				System.out.println(" ");
				}else if(x==2&&y==1)
				{
                a++;
				System.out.println("剪刀------电脑:石头    PK:很遗憾,输了!");
				System.out.println(" ");
				System.out.println(" ");
				}else
				{
                a++;
				System.out.println("布------电脑:剪刀    PK:很遗憾,输了!");
				System.out.println(" ");
				System.out.println(" ");
				}
			}
		}
		}