2021-01-07

java写的一小段程序 运行不了，

import java.util.Scanner;

public class Main{
	public static void main(String[] args) {
		Scanner scanner=new Scanner(System.in);
		System.out.println("输入 A ");
	    String A= scanner.nextLine();
    	System.out.println("输入 B ");
    	String B=scanner.nextLine();
    	System.out.println(A);
    	System.out.println(B);
	    if(A=="剪刀"){
	  
	    	switch(B) {
	    	case "剪刀":
	    		System.out.println("平局");
	    		break;
	    	case "石头":
	    	   System.out.println("B win!");
	    	   break;
	    	case "布":
	    		System.out.println("A win!");
	    		break;
	    	default:
	    	
	    	}
	    }
	    
	    
	    else if(A=="石头") {

	    	switch(B) {
	    	case "剪刀":
	    		System.out.println("A win!");
	    		break;
	    	case "石头":
	    	   System.out.println("平局");
	    	   break;
	    	case "布":
	    		System.out.println("B win!");
	    		break;
	    	default:
	    	
	    	}
	    }
	    
	    else if(A=="布") {
	    	
	    	switch(B) {
	    	case "剪刀":
	    		System.out.println("B win!");
	    		break;
	    	case "石头":
	    	   System.out.println("A win!");
	    	   break;
	    	case "布":
	    		System.out.println("平局");
	    		break;
	    	default:
	    	
	    	}
	    }
		
	}
	
}