Java栈的实现数组和链表

一、栈结构
栈是一种，先进后出，后进先出的数据结构，只有一端能够进行操作，是一种操作受限制的线形表

二、栈的实现

1. 通过数组实现
 1  2 
 3 import java.util.Arrays;
 4 
 5 //栈数组实现
 6 public class ArrayStack {
 7     //定义一个数组存储数据
 8     private String stack[];
 9     //栈中元素个数
10     private int count;
11     //栈大小
12     private int n;
13 
14     public ArrayStack(int n) {
15         this.stack = new String[n];
16         this.n = n;
17         this.count = 0;
18     }
19 
20     @Override
21     public String toString() {
22         return "ArrayStack{" +
23                 "stack=" + Arrays.toString(stack) +
24                 ", count=" + count +
25                 ", n=" + n +
26                 ‘}‘;
27     }
28 
29     
36     public boolean push(String item) throws Exception {
37         if (n == count) {
38             throw new Exception();
39         }
40         stack[count] = item;
41         count++;
42         return true;
43     }
44 
45     public String pop() throws Exception {
46         if (n == 0) {
47             throw new Exception();
48         }
49         String tmp = stack[count - 1];
50         stack[count-1] = null;
51         count--;
52         return tmp;
53 
54     }
55 
56     public static void main(String[] args) throws Exception {
57         ArrayStack arrayStack = new ArrayStack(5);
58 
59         arrayStack.push("a");
60         System.out.println(arrayStack);
61 
62         arrayStack.push("b");
63         System.out.println(arrayStack);
64 
65         String pop = arrayStack.pop();
66         System.out.println(pop);
67         System.out.println(arrayStack);
68 
69 
70     }
71 
72 }

通过链表实现
链表节点
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 1 public class Node {
 2     public String data;
 3     public Node next;
 4 
 5     public Node() {
 6     }
 7 
 8     public Node(String data) {
 9         this.data = data;
10     }
11 
12     public Node(String data, Node next) {
13         this.data = data;
14         this.next = next;
15     }
16 
17     @Override
18     public String toString() {
19         return "Node{" +
20                 "data=‘" + data + ‘‘‘ +
21                 ‘}‘;
22     }
23 }

实现

 1 public class linkedListStack {
 2     private Node head;
 3 
 4     public linkedListStack() {
 5     }
 6 
 7     @Override
 8     public String toString() {
 9         StringBuffer sb = new StringBuffer();
10         Node tmp = head;
11         while (tmp!=null){
12             sb.append(tmp.data).append(",");
13             tmp = tmp.next;
14         }
15 
16         return sb.toString();
17     }
18 
19     public boolean push(String item){
20         head = new Node(item,head);
21         return true;
22     }
23 
24     public String pop() throws Exception{
25         if(head==null){
26            throw new Exception();
27         }
28 
29         String tmp =  head.data;
30         head =head.next;
31         return  tmp;
32     }
33 
34     public static void main(String[] args) throws Exception{
35         linkedListStack stack = new linkedListStack();
36         stack.push("a");
37         System.out.println(stack);
38 
39         stack.push("b");
40         System.out.println(stack);
41 
42         String pop = stack.pop();
43         System.out.println(pop);
44         System.out.println(stack);
45 
46 
47     }
48 }