package com.homework01;
public class Stack {
private ArrayList array = new ArrayList();
public void push(Object o){
array.add(o);
}
public Object pop(){
return array.remove(array.size()-1);
}
public boolean isEmpty(){
if(array.size()<=0)
return true;
return false;
}
public int size(){
return array.size();
}
public static void main(String[] args) {
Stack sc = new Stack();
sc.push("hello world");
sc.push("java");
sc.push("jvm");
}
}