OOP 2: Container

/*
 * This is another simple example class for Object-Oriented Programming.
 * It represents a container that can have another box inside it - but you can only put something in it
 * or see what's in it if the container is open (think of it as an opaque lid).  You can also only
 * store things in the Container that are smaller than the Container is. Modifying this class so that
 * it checks not just the total volume, but also each individual side, is left as an exercise to the
 * user.
 *
 * This class extends the Box class here: http://pastebin.com/mCu64xbP
 *
 * Created by replicaJunction on 1/11/2013.
 */

public class Container extends Box
{
    private Box myContents;
    private boolean isOpen;

    public Container(int l, int w, int h)
    {
        super(l, w, h);
        isOpen = false;
    }

    public void open()
    {
        isOpen = true;
    }

    public void close()
    {
        isOpen = false;
    }

    public Box getContents()
    {
        if (isOpen)
            return myContents;
        else
            return null;
    }

    public boolean setContents(Box newContents)
    {
        if (isOpen == false)
            return false;

        int contentVolume = newContents.getVolume();
        if (contentVolume >= getVolume() )
            return false;

        myContents = newContents;
        return true;
    }
}