Map 的两种遍历方式

 

 

 

                方法一
		HashMap map = new HashMap();
		
		map.put("a", "zhangsan");
		map.put("b", "lisi");
		map.put("c", "wangwu");

		System.out.println( map );
		
		Set set = map.entrySet();
		map.values();
		System.out.println( set );
		Iterator it = set.iterator();
		while ( it.hasNext() ) {
			Entry entry= (Entry) it.next();
			System.out.println( entry.getKey() +"    "+entry.getValue());
		}
		
//方法二		
//		Set set = map.keySet();
//		Iterator it = set.iterator();
//		while( it.hasNext()){
//			String key = (String) it.next();
//			System.out.println( map.get(key));
//		}