if语句的猜拳游戏

public class caiquan{
	public static void main(String[] args){
		System.out.println("人机大战");
		Scanner scanner=new Scanner(System.in);
		String player="";
		String computer="王者";
        System.out.println("请输入玩家的名字");
		player=scanner.next();
		System.out.println(player+"VS"+computer);
        System.out.println("游戏开始？y/n");
		String answer=scanner.next();
		if("y".equalsIgnoreCase(answer)){
	    System.out.println("游戏开始");
		System.out.println("游戏规则：");
		System.out.println("1.石头 2.剪刀 3.布");
		System.out.println("请玩家出拳：");
		int playfist=scanner.nextInt();
		switch(playfist){
			case 1:System.out.println("玩家出石头");break;
			case 2:System.out.println("玩家出剪刀");break;
			case 3:System.out.println("玩家出布");break;
			default:System.out.println("游戏错误");
			}
		int computerfist=(int)(Math.random()*3+1);
		switch(computerfist){
			case 1:System.out.println("电脑出石头");break;
			case 2:System.out.println("电脑出剪刀");break;
			case 3:System.out.println("电脑出布");break;
       }
	   if(playfist==1){
		   if(computerfist==1){
		   System.out.println("平局");
			 }else if(computerfist==2){
			   System.out.println(player+"赢");
		   }else if(computerfist==3){
		   System.out.println("王者赢");}
	 else if(playfist==2){
		   if(computerfist==1){
		   System.out.println("王者赢");
			 }else if(computerfist==2){
			   System.out.println("平局");
		   }else if(computerfist==3){
		   System.out.println(player+"赢");}
		else  if(playfist==3){
		   if(computerfist==1){
		   System.out.println(player+"赢");
			 }else if(computerfist==2){
			   System.out.println("王者赢");
		   }else if(computerfist==3){
		   System.out.println("平局");}
		else{
			   System.out.println("由于出拳规则，游戏结束");
		   }
		
		}
		  }
		else{

		System.out.println("游戏结束");}
	 }


		}