Map遍历的常用方法
Map<Integer, String> map = new HashMap<Integer, String>(); map.put(0, "zero"); map.put(1, "one"); map.put(2, "two");
方法一:最常用的
// 获取key值 Collection<Integer> k = map.keySet(); Iterator<Integer> itK= k.iterator(); System.out.println(k); for (; itK.hasNext();) { System.out.println(itK.next()); }
运行结果:
[0, 1, 2]
0
1
2
//获取value值 Collection<String> v = map.values(); Iterator<String> itV = v.iterator(); System.out.println(v); for (; itV.hasNext();) { System.out.println(itV.next()); }
运行结果:
[zero, one, two]
zero
one
two
方法二:根据key值得到value值
Set<Integer> key = map.keySet(); for (Iterator<Integer> it = key.iterator(); it.hasNext();) { Integer s = (Integer)it.next(); System.out.println(s); System.out.println(map.get(s)); }
运行结果:
0
zero
1
one
2
Two
方法三:比较复杂,但灵活性强
Set<Map.Entry<Integer, String>> set = map.entrySet(); for (Iterator<Map.Entry<Integer, String>> it = set.iterator(); it.hasNext();) { Map.Entry<Integer, String> entry = (Map.Entry<Integer, String>) it.next(); System.out.println(entry.getKey() + "--->" + entry.getValue()); }
运行结果:
0--->zero
1--->one
2--->two
参考网址:http://zhidao.baidu.com/question/283029340.html