MyStack.java

package com.dudy.learn01.data_structure.stack;

import com.dudy.learn01.data_structure.list.MyArrayList;

public class MyStack {
	private MyArrayList elementData = new MyArrayList();
	
	public void push(Object o){
		elementData.add(o);
	}
	
	public Object pop(){

        Object o = elementData.get(elementData.size()-1);
        elementData.remove(elementData.size());
        return o;
	}
	
	public Object peek(){

		return elementData.get(elementData.size()-1);
	}
	public boolean isEmpty(){
		return elementData.size() == 0;
	}
	public int size(){
		return elementData.size();
	}
}