Question

I have code like:

class Entity;

class EntityTool extends Entity;
class EntitySprite extends Entity;

class EntityToolSpoon extends EntityTool;
class EntityToolBow extends EntityTool;
class EntitySpritePlayer extends EntitySprite;
class EntitySpriteMonster extends EntitySprite;

Now I have a method called move() in Entity, and some others overwrite it.

Now, if the argument is an EntitySpriteMonster, why does this not work:

public void foonction(Object wut)
{
    if (wut instanceof Entity) ((Entity)wut).move(x,y);
}

The move function (though this is redundant and unneeded. it fails at if rawpeek instanceof...):

@Override
public void move(double x, double y) {
    super.move(x, y);
    for (int i=0; i<8; i++) {
        Object rawpeek = palette.get(i);
        System.out.println(rawpeek);
        if (rawpeek == null) continue;
        if (rawpeek instanceof Entity)
            ((Entity) rawpeek).move(x, y);
    }
}

EDIT: It just aborts. (operator instanceof returns false)

Eclipse shows me in debug, that wut is definetly an EntitySpriteMonster.

Answer 1

Problem solved!

The above use of instanceof was correct.
The problem instead was:

((Inventory)palette).get(index) returned an InventorySlot, and not a Entity. InventorySlot contains Entites, so I was missing to peek the first item from the container.

My correct code should be Object rawpeek = paltte.get(i).peek();

Thanks everyone for trying. And sorry for this obvious problem.