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Stack.java
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64 lines (53 loc) · 1.21 KB
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package org.example.Stack;
import java.util.EmptyStackException;
public class Stack {
private ListNode top;
private int length;
private class ListNode{
private int data;
private ListNode next;
public ListNode(int data){
this.data = data;
}
}
public Stack(){
top = null;
length = 0;
}
public int length(){
return length;
}
public boolean isEmpty(){
return length == 0;
}
public void push(int data){
ListNode temp = new ListNode(data);
temp.next = top;
top = temp;
length++;
}
public int pop(){
if(isEmpty()){
throw new EmptyStackException();
}
int result = top.data;
top = top.next;
length--;
return result;
}
public int peak(){
if(isEmpty()){
throw new EmptyStackException();
}
return top.data;
}
public static void main(String[] args) {
Stack stack = new Stack();
stack.push(10);
stack.push(15);
stack.push(20);
System.out.println(stack.peak());
stack.pop();
System.out.println(stack.peak());
}
}