Map的遍历

Map的遍历

public void testMap() {
		Map<String, String> map = new Hashtable<String, String>();
		map.put("1", "1s");
		map.put("2", "2s");
		map.put("3", "3s");
		map.put("4", "4s");
		map.put("5", "5s");
		// 1推荐使用
		for (Map.Entry<String, String> entry : map.entrySet()) {
			String key = entry.getKey();
			String value = entry.getValue();
			System.out.println("key0=" + key + ",value0=" + value);
		}

		System.out.println();
		// 2
		Iterator iter = map.entrySet().iterator();
		while (iter.hasNext()) {
			Map.Entry<String, String> entry = (Map.Entry<String, String>) iter.next();
			String key = entry.getKey();
			String value = entry.getValue();
			System.out.println("key1=" + key + ",value1=" + value);
		}

		System.out.println();
		// 3
		Iterator iter1 = map.keySet().iterator();
		while (iter1.hasNext()) {
			String key = (String) iter1.next();
			String value = map.get(key);
			System.out.println("key2=" + key + ",value2=" + value);
		}
	}