1 import java.util.HashMap;
2 import java.util.Iterator;
3 import java.util.Map;
4 import java.util.Map.Entry;
5
6 /**
7 * <p>遍历Map集合</p>
8 * @author:774346810@qq.com
9 * @date:2017-5-30
10 */
11 public class Test {
12 public static void main(String[] args) {
13 Map<String, String> map = new HashMap<String, String>();
14 map.put("username", "yujiwei");
15 map.put("password", "12345");
16 map.put("address", "hangzhou");
17 map.put("love", "编程");
18 //1.获取所有的key
19 for(String key : map.keySet()){//返回的是map的key值
20 String value = map.get(key);//通过key取value
21 System.out.println("key = " + key + ",value = " + value);
22 }
23
24 System.out.println("----------------------------------");
25
26 //2.通过map.entrySet的iterator来遍历Map集合
27 Iterator<Entry<String, String>> it = map.entrySet().iterator();
28 while(it.hasNext()){
29 Entry<String, String> entry = it.next();
30 System.out.println("key= " + entry.getKey() + " and value= " + entry.getValue());
31 }
32
33 System.out.println("----------------------------------");
34
35 //3.通过Map.Entry来遍历Map集合
36 for(Map.Entry<String, String> entry : map.entrySet()){
37 System.out.println("key= " + entry.getKey() + " and value= "+ entry.getValue());
38 }
39 }
40 }
