【Java】在map中根据value获取key

//根据map的value获取map的key  
    private static String getKey(Map map,String value){  
        String key="";  
        for (Map.Entry entry : map.entrySet()) {  
            if(value.equals(entry.getValue())){  
                key=entry.getKey();  
            }  
        }  
        return key;  
    }