package com.coding.basic;
public class Stack {
private ArrayList elementData = new ArrayList();
public Stack() {
// TODO Auto-generated constructor stub
}
public void push(Object o) {
elementData.add(o);
}
public Object pop() {
int size = elementData.size();
Object o = elementData.get(size - 1);
elementData.remove(size - 1);
return o;
}
public Object peek() {
int size = elementData.size();
Object o = elementData.get(size - 1);
return o;
}
public boolean isEmpty() {
if (elementData.size() == 0)
return true;
return false;
}
public int size() {
return elementData.size();
}
}