集合框架-LinkedList集合(有序不唯一) 

 1 package cn.itcast.p2.linkedlist.demo;
 2 
 3 import java.util.Iterator;
 4 import java.util.LinkedList;
 5 
 6 public class LinkeListDemo {
 7 
 8     public static void main(String[] args) {
 9         // TODO Auto-generated method stub
10         LinkedList link = new LinkedList();
11         
12         link.addFirst("abc1");
13         link.addFirst("abc2");
14         link.addFirst("abc3");
15         link.addFirst("abc4");
16 //        System.out.println(link.getFirst());//获取第一个但不删除
17 //        System.out.println(link.getFirst());
18     
19 //        System.out.println(link.removeFirst());//获取元素但是会删除
20 //        System.out.println(link.removeFirst());
21         
22         while(!link.isEmpty()) {
23             System.out.println(link.removeFirst());//打印 abc4 
24 //                                                         abc3
25 //                                                         abc2
26 //                                                         abc1
27 //                                                         []
28         }
29 //        Iterator it = link.iterator();
30 //        while (it.hasNext()) {
31 //            System.out.println(it.next());
32 //        }
33     }
34 
35 }
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posted @ 2021-10-19 22:09  doremi429  阅读(31)  评论(0)    收藏  举报