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 }