浅析java中遍历map的两种方式

 Iterator iterator = map.entrySet().iterator();
 while(iterator.hasNext()){
   Entry entry = iterator.next(); 
   System.out.println(entry.getKey());   // 获取key
   System.out.println(entry.getValue());  // 获取value
 } 

 Iterator iterator = map.keySet().iterator();
 while(iterator.hasNext()){            
  Object key = (Object)iterator.next();
   System.out.println(key);        // 获取key
  System.out.println(map.get(key));   // 获取value
 }