public abstract class MyAbstractList<E> implements MyList<E> {
  protected int size = 0; // The size of the list

  /** Create a default list */
  protected MyAbstractList() {
  }

  /** Create a list from an array of objects */
  protected MyAbstractList(E[] objects) {
    for (int i = 0; i < objects.length; i++)
      add(objects[i]);
  }

  /** Add a new element at the end of this list */
  public void add(E e) {
    add(size, e);
  }

  /** Return true if this list contains no elements */
  public boolean isEmpty() {
    return size == 0;
  }

  /** Return the number of elements in this list */
  public int size() {
    return size;
  }

  /** Remove the first occurrence of the element o from this list.
   *  Shift any subsequent elements to the left.
   *  Return true if the element is removed. */
  public boolean remove(E e) {
    if (indexOf(e) >= 0) {
      remove(indexOf(e));
      return true;
    }
    else
      return false;
  }
}
