package com.coding;
public class Stack<T> {
private ArrayList<T> elementData = new ArrayList<T>();
public void push(T o){
elementData.add(o);
}
public T pop(){
return elementData.remove(elementData.size() - 1);
}
public T peek(){
return elementData.get(elementData.size() - 1);
}
public boolean isEmpty(){
return elementData.size() == 0;
}
public int size(){
return elementData.size();
}
}