如何遍历数组

Posted 2020-11-10 苏尘羽

 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 }