package week01.basic;
public class MyStack {
private MyArrayList elementData = new MyArrayList();
public void push(Object o) {
elementData.add(o);
}
public Object pop() {
return elementData.remove(size() - 1);
}
public Object peek() {
return elementData.get(size() - 1);
}
public boolean isEmpty() {
return elementData.size() == 0;
}
public int size() {
return elementData.size();
}
}