Discussions

You really need to be more specific. Show the two classes involved and point to what you are trying to access and from where. Non-static methods are always called on an object created from the class the method is in. If no object is explicitly given, then the method is being called from within the class (or from a subclass) and the object is the same as that which the calling method was executing on and can be referenced by the keyword 'this'. Calling on a object created by a different class, you must explicitly g

oh Wow thanks, I did not notice that

Vielen Dank für eure Hilfen, hat mir sehr geholfen.

You were right i overlooked this. field Rotation was initialized in my constructor and given a random value which was than assigned to setRotation(). I could have actually used setRotation(Greenfoot.getRandomNumber(...)); When they collide it would set the rotation field from Actor to the new value but not rotation in my class which was used to calculate the new rotation. So it appeared as it was being ignored but it actually just set it to the same amount every time. Thanks for changing my point of view, was clueless here for a while.

Line 19 should add a cherry -- not a blueberry.

The demo was geared toward the movement -- not really anything else. However, the shooting code is in the Invader class. The last line in its act method partly controls when a shot is fired by having each invader shoot randomly, but on an average of once every 200 act cycles. In the shoot method, shooting is further limited to only if the invader is the lowest one in its column. For some unkno

The / is just division. Actually, in this case, it is integer division where any fractional remainder is discarded (only because we are working with integer values). The % is the modulus operator. It returns the remainder after division So, as the iterator, i, progresses from 0 to 31, i/8 will be 0 until i=8, then 1 until i=16, etc., while i%8 will repeatedly go from 0 to 7. One complete cycle from 0 to 7 will occur for each "increment" of i/8 (which will go from 0 to 3).

You might like to have a look at this video . The score counter starts at about 5:45.

You need to remove the import of "java.awt.Color" at the top of any class which won't compile. The Greenfoot API changed in version 3.1.0 and some older scenarios aren't compatible with it; full details here.

Also, I forgot to mention what I'm trying to accomplish is a rhythm game that gives point based on how close you pressed the button at the "Target" area. Right now the notes are Random but plan on making them sync to a beat later on. Here is an example of something similar to what i want to make: Youtube Link ]

You will need to track which direction the ship is currently moving. The speed is a constant and can be hard-coded or held in a field. The new y-coordinate of the ship in your setLocation line can then be expressed as 'getY()+dir*speed' or 'getY()+dir*5', for example. The 'dir' field, as an int, would hold a value of '1' or

That is because the bullet is not being removed when hitting a barrier. In the Bullet class hitBarrrier method (as last shown), add after line 4: <Code Omitted>

Thank you so much! I completely missed that. :) It works as expected now!