方法1： 
HashMap staff = new HashMap();  
Set entries = staff.entrySet();  
Iterator iter = entries.iterator();  
while(iter.hasNext())  
{  
      Map.Entry entry = (Map.Entry)iter.next();  
      Object key = entry.getKey();  
      Object value = entry.getValue();  
} 
   
方法2： 
Map map = new HashMap(); 
for(Iterator iter = map.entrySet().iterator(); iter.hasNext();) { 
    Map.Entry entry = (Map.Entry) iter.next();    //map.entry 同时取出键值对 
    Object key = entry.getKey(); 
    Object val = entry.getValue(); 
} 
   
方法3： 
Map map = new HashMap(); 
for (Iterator iter = map.keySet().iterator(); iter.hasNext();) { 
    Object key = iter.next(); 
    Object val = map.get(key); 
} 
方法4：
       Set set2 = map.entrySet();
          for(Object i:set2)
          {
               Entry entry = (Entry)i;
               System.out.println(entry.getKey()+"--"+entry.getValue());
          }