最常用,在键值都需要时使用。

Map
     
       map = new HashMap
      
       (); for (Map.Entry
       
         entry : map.entrySet()) {   System.out.println("Key = " + entry.getKey() + ", Value = " + entry.getValue()); }
       
      
     

在for-each循环中遍历keys或values。

Map
     
       map = new HashMap
      
       (); //遍历map中的键 for (Integer key : map.keySet()) {   System.out.println("Key = " + key); } //遍历map中的值 for (Integer value : map.values()) {   System.out.println("Value = " + value); }
      
     

使用Iterator遍历

Map
     
       map = new HashMap
      
       (); Iterator
       
        
         > entries = map.entrySet().iterator(); while (entries.hasNext()) {   Map.Entry
         
           entry = entries.next();   System.out.println("Key = " + entry.getKey() + ", Value = " + entry.getValue()); }
         
        
       
      
     

Map map = new HashMap(); Iterator entries = map.entrySet().iterator(); while (entries.hasNext()) {   Map.Entry entry = (Map.Entry) entries.next();   Integer key = (Integer)entry.getKey();   Integer value = (Integer)entry.getValue();   System.out.println("Key = " + key + ", Value = " + value); }

通过键找值遍历（效率低）

Map
     
       map = new HashMap
      
       (); for (Integer key : map.keySet()) {   Integer value = map.get(key);   System.out.println("Key = " + key + ", Value = " + value);