1 package collections;
2
3 import java.util.HashMap;
4
5 public class HashMapDemo {
6
7 public static void main(String[] args) {
8 HashMap<String, String> map = new HashMap<String, String>();
9 // 添加内容，内容以key/value方式填入
10 map.put("湘南IT培训", "https://www.0735it.com/");
11 map.put("google","https://www.google.com/");
12 map.put("利永贞网","https://www.liyongzhen.com");
13
14 // java 5 for 方式遍历;后进先出来
15 for(String key:map.keySet()) {
16 System.out.printf("key %s;\nvalue %s\n",key,map.get(key));
17 }
18
19 // java 8 forEach 方式遍历
20 map.entrySet().forEach(e->
21 System.out.printf("key %s;\nvalue %s\n",e.getKey(),e.getValue())
22 );
23 }
24
25 }
