1.宣告一個map: Map map = new HashMap();

2.向map中放值,注意：map是key-value的形式存放的.如:     

map.put("sa","dd");

3.從map中取值:

String str = map.get("sa").toString();

4.遍歷一個map，從中取得key 和value

JDK1.5

  Map   m   =   new   HashMap();   
  for   (Object   o   :   map.keySet())   {   
          map.get(o);   
  }
 

JDK1.4

  Map   map   =   new   HashMap()   ;   
    
  Iterator   it   =   map.entrySet().iterator()   ;   
  while   (it.hasNext()) {   
     Map.Entry   entry   =   (Map.Entry)   it.next()   ;   
     Object   key   =   entry.getKey()   ;   
     Object   value   =   entry.getValue()   ;   
  }