switch不能字符串比较解决方法

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public void switchCaseStr() {  
    
  Map<String,Integer> map=new HashMap<String, Integer>();  
    
  map.put("hello", 1);  
  map.put("haha", 2);  
  map.put("yes", 3);  
  map.put("in", 4);  
    
   
  String str="hello";  
    
  switch(map.get(str))  
  {      
   case 3:  
        System.out.println("yes");  
       break;  
   case 1:  
        System.out.println("hello");  
        break;  
    case 2:  
        System.out.println("haha");  
       break;  
    case 4:  
       System.out.println("in");  
       break;  
    
   default:  
    System.out.println("default");