LinkedStack
LinkedStack.java 源码
package datastructure.stack;
import java.util.EmptyStackException;
/**
* @author roseduan[roseduan520@gmail.com]
* @time 2019/10/27 15:28
* @description 使用链表实现栈
*/
public class LinkedStack {
private ListNode head;
private int size;
public LinkedStack(int val) {
this.head = new ListNode(val);
this.size = 1;
}
private static class ListNode{
int val;
ListNode next;
ListNode(int val) {
this.val = val;
this.next = null;
}
}
/**
* 入栈
*/
public void push(int value) {
ListNode node = new ListNode(value);
size++;
if (head == null) {
head = node;
}
else {
node.next = head;
head = node;
}
}
/**
* 出栈
*/
public int pop(){
if (head == null){
throw new EmptyStackException();
}
ListNode result = head;
head = head.next;
size--;
return result.val;
}
/**
* 获取栈顶元素
*/
public int peek(){
if (head == null){
throw new EmptyStackException();
}
return head.val;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
ListNode p = head;
while (p != null){
sb.append(p.val).append(" ");
p = p.next;
}
return sb.toString();
}
}
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