Map<String, Integer> map = new HashMap<String, Integer>();

		map.put("zhangsan", 1);

		map.put("lisi", 2);

		map.put("zhangsan", 3);

		map.put("wangwu", 4);

		map.put("tianqi", 5);

		//获取数据，存放set

		//如果用list<string>接受不可用。报错。

		Set<String> keys = map.keySet();

		Iterator<String> iter = keys.iterator();

		//输出

		while(iter.hasNext())

		{

			System.out.print( iter.next() + "、");

		}

		System.out.println(keys);

lisi、zhangsan、wangwu、tianqi、

[lisi, zhangsan, wangwu, tianqi]

Map<String,Integer> allMap = new HashMap<String, Integer>();

		allMap.put("zhangsan", 1);

		allMap.put("zhangsan", 2);

		allMap.put("lisi", 3);

		allMap.put("tianqi", 4);

		Integer value = allMap.get("zhangsan");

		System.out.println(value);

Map<String, Integer> map = new HashMap<String, Integer>();

		map.put("zhangsan", 1);

		map.put("lisi", 2);

		map.put("zhangsan", 3);

		map.put("wangwu", 4);

		map.put("tianqi", 5);

		//获取数据，存放set

		//如果用list<string>接受不可用。报错。

		Set<String> keys = map.keySet();

		Iterator<String> iter = keys.iterator();

		//输出

		while(iter.hasNext())

		{

			String key = iter.next();

			System.out.println( key + " --> " + map.get(key) + "、");

		}

		System.out.println(keys);

lisi --> 2、

zhangsan --> 3、

wangwu --> 4、

tianqi --> 5、

[lisi, zhangsan, wangwu, tianqi]