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StackBasedOnLinkedList.java
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54 lines (47 loc) · 921 Bytes
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package stack;
/**
* 基于链表实现的栈。
*
* Author: Zheng
*/
public class StackBasedOnLinkedList {
private Node top = null;
public void push(int value) {
Node newNode = new Node(value, null);
// 判断是否栈空
if (top == null) {
top = newNode;
} else {
newNode.next = top;
top = newNode;
}
}
/**
* 我用-1表示栈中没有数据。
*/
public int pop() {
if (top == null) return -1;
int value = top.data;
top = top.next;
return value;
}
public void printAll() {
Node p = top;
while (p != null) {
System.out.print(p.data + " ");
p = p.next;
}
System.out.println();
}
private static class Node {
private int data;
private Node next;
public Node(int data, Node next) {
this.data = data;
this.next = next;
}
public int getData() {
return data;
}
}
}