i guess the constructor of your Wallpiece Class is missing in the WP_Hard Class. try something like: In the Constructor of your WP_Hard. Where 0 ist your Integer and world is an object of your Spielfeld. (I hope this will fix your error) Jonas

no world was just an example you need to replace world with the object of your current World. So in your case you need to write the object of Spielfeld in there. Jonas

It appears it is looking for a Wallpiece constructor with NO parameters. Either you are using 'new WP_Hard()' (with no parameters), or you need to add an empty constructor in the Wallpiece class. You do not have to re-declare 'Spieler spieler;' in the WP_Hard class as it is inherited from the Wallpiece class. I really do not see a need for the WP_Hard sub-class of Wallpiece. I would remove that class altogether; then, in the Wallpiece class, I would remove 'Spielfeld spf;', change the constructor declaration to 'public Wallpiece(int t, Spieler spieler)', remove the 'spf = spielfeld;' line from the constructor and remove the creation and adding of a new WP_Hard object from the act method. I am not sure if you actually meant '!=' in the 'if (getOneIntersectingObject(Spieler.class) == null)' command. To control the paint order to have one type of object visually over another, use the 'setPaintOrder' method found in the World class API.

Thanks for setPaintOrder, it worked perfect! I removed WP_Hard now, but i still have a problem: I have two objects of the class "Spieler", they move with the speed 3 and then create a wallpiece at their actual location: The Spielers can also turn and if they touch a Wallpiece of one of the both, they should change their image, but the problem is, if they create one at their actual location, they must touch it. I tried to make a boolean in Wallpiece, that changes to false if they stop touching a Spieler for the first time, but the bad thing is, that i can’t let the Spieler ask, if athe specific boolean of the one Wallpiece they touched changed to false, because they just know the one that they created last. I thinked of naming the Wallpieces (wp ’s) with numbers, like wp1, wp2,... and then, if they collide i would let the Spieler ask which Wallpiece he touched and if this one has the one boolean at false, but i don’t know how to combinate the names with integers.

you can do sth. like this: getIntersectingObject returns all Objects of a specific Class that intersect your actor. And then you just use a loop over all the Objects and you are checking if anyone of them has false as the value (the isFirstColliding() Method). The way you want to do it would be with an ArrayList where you add every new Object into the list and check them afterwards. Jonas

I am wondering why it would matter whether that Spieler had just created it or not. Maybe you should be more explicit as to how the coloring should work. If one Spieler object creates Wallpiece objects of one color and changes Wallpiece objects to that same color and the other does the same with a different color, then it should not matter if one RE-paints a Wallpiece object it just created.

Tried it, but it says: incompatible types - found java.util.List but expected java.util.ArrayList<Wallpiece> It marked the Wallpiece.class in the brackets.

You have to cast the return from 'getIntersectingObject(Wallpiece.class)' with '(ArrayList<Wallpiece>)'. You can avoid having to import the List and ArrayList classes by adjusting the code.