遍历Map集合的四种方式

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

		for(int i=0;i<100;i++){
			map.put(i+"", i+"");
		}

		//遍历值
		System.out.println("遍历值");
		for(String value : map.values()){
			System.out.println(value);
		}

		//遍历键
		System.out.println("遍历键");
		for(String key:map.keySet()){
			System.out.println(key+":"+map.get(key));
		}

		//通过迭代器
		System.out.println("通过迭代器");
		Iterator<Map.Entry<String, String>> iterator = map.entrySet().iterator();
		while(iterator.hasNext()){
			Map.Entry<String, String> entry = iterator.next();
			System.out.println(entry.getKey()+":"+entry.getValue());
		}

		//entrySet遍历
		System.out.println("entrySet");
		for(Map.Entry<String, String> entry:map.entrySet()){
			System.out.println(entry.getKey()+":"+entry.getValue());
		}

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