java中的map分割 java中map取值

java编程之map取值
1、第一种方式

HashMap hm = new HashMap();
 Set set = hm.entrySet();
 Iterator it = set.iterator();
 while(it.hasNext()){
       Map.Entry mEntry = (Entry) it.next();
       String keyString = (String) mEntry.getKey();
       String valueString = (String) mEntry.getValue();
       .....
 }

2、第二种方式

HashMap map = new HashMap();
  Set keys = map.keySet( );   
  if(keys != null) { 
        Iterator iterator = keys.iterator( ); 
        while(iterator.hasNext( )) { 
           Object key = iterator.next( ); 
           Object value = map.get(key); 
            .... 
        } 
     }

3、第三种方式

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