Discussions

If a method should return an object which contains a method and you call this method like this methodReturningAnObject().methodOfTheReturnedObject(); It is possible that the first method returns null. That would be the same as null.methodOfTheReturnedObject(); what doesn't realy make sense. In this cases you get a NullPointerException which tells you that something went wrong.

So basically, what I said.

The (SuperClass) in front of getOneIntersectingObject(clss) was the thing I was looking for. Thank you.

Thank you, too.

Crudely written, the code would look something like the following: <Code Omitted>As an added effect, the next line could be: <Code Omitted>this will cause the pendulum to eventually settle. However, starting a new swing will require some work determining what the counter valu

Deleting the object does not reset the variable. The variable stays with the object you delete. However, if there are no more references to the object, it will no longer be accessible to you and it will be flagged for garbage collection. Each object you create from that class will have a seperate variable with that name; this is why we call those variables 'instance object variables' (or 'instance object fields'; a.k.a. 'properties'); since each instance created from that class will have a set of its own.

Okay, thanks a lot for your help !

You need to place the new Lazer object in the world relative to the location of the EnergyBall object. <Code Omitted>

Thanks a lot. It works perfectly

Thank you for all of you .

That usually means you have you have something in the wrong place. Possibly something in the act method (or a method it calls) that should be either in the constructor of the object or in the 'started' or 'addedToWorld' method. Another possibility is not regulation the number of objects that are created in the act method (one being created every act frame). Without seeing your complete error message and the related code, it would be difficult to help you further.

See our scenario: http://www.greenfoot.org/scenarios/7266 And our website, ade-studios.weebly.com We don't provide source code as it would ruin the competition, but we give useful hints.

You just have to alter the coding for where the bullet is created, and where it moves.