Interactables.java

import greenfoot.*;
public class Interactables extends Actor
{
    public void disappear() {
        if (isAtEdge()) {
            getWorld().removeObject(this);
        }
    }
    public boolean canSee(Class clss)
    {
        Actor actor = getOneObjectAtOffset(0, 0, clss);
        return actor != null;        
    }
}