Java的学习05

 1 /**
 2  * 自定义一个链表
 3  * @author 小白
 4  *
 5  */
 6 public class SxtLinkedList {
 7 
 8     private Node first;
 9     private Node last;
10     
11     private int  size;
12     
13     public void add(Object obj){
14         Node node = new Node(obj);
15         
16         if(first==null){
17             
18             first = node;
19             last = node;
20         }else{
21             node.previous = last;
22             node.next = null;
23             
24             last.next = node;
25             last = node; 
26         }
27     }
28     
29     @Override
30     public String toString() {
31         StringBuilder sb = new StringBuilder("[");
32         Node temp = first;
33         while(temp!=null){
34             sb.append(temp.element + ",");
35             temp = temp.next;
36         }
37         sb.setCharAt(sb.length()-1, ‘]‘);
38         return sb.toString();
39         
40     }
41 
42 
43 
44     public static void main(String[] args) {
45         SxtLinkedList list = new SxtLinkedList();
46         list.add("a");
47         list.add("b");
48         list.add("c");
49         
50         System.out.println(list);
51     }
52 
53 }