集合工具类

 1 import java.util.ArrayList;
 2 import java.util.Collections;
 3 import java.util.List;
 4 
 5 public class 集合工具类 {
 6     public static void main(String[] args) {
 7         List<String> list = new ArrayList<String>();
 8         list.add("张三");
 9         list.add("李四");
10         list.add("王五");
11         System.out.println(list);
12         //反转
13         Collections.reverse(list);
14         System.out.println(list);
15         //打乱集合
16         Collections.shuffle(list);
17         System.out.println(list);
18         //排序
19         Collections.sort(list);
20         System.out.println(list);
21     }
22 }

 

转载于:https://www.cnblogs.com/java-jiangtao-home/p/9374723.html