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Multithreading: bouncing balls problem

Joe Fett
Greenhorn

Joined: Jul 16, 2008
Posts: 9
I had to find a program that demos a bouncing ball in JPanel and I did that. The next evolution is taking that program and making it add a new ball with each mouse click. I have attempted a few things but now I am totally lost with this project. I was able to get the code to compile but not run.

Anyone have a helpful idea how I can unfunk this code and get it going the right direction? As always, the help is appreciated!





I think I have one clue left...
Ulf Dittmer
Marshal

Joined: Mar 22, 2005
Posts: 39547
    
  27
What's with all the UnsupportedOperationExceptions? Does the code run if you remove those? If so, what does it do, and where are you stuck making progress?


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Joe Fett
Greenhorn

Joined: Jul 16, 2008
Posts: 9
Originally posted by Ulf Dittmer:
What's with all the UnsupportedOperationExceptions? Does the code run if you remove those? If so, what does it do, and where are you stuck making progress?


As I was going through and resolving the issues, I let NetBeans resolve them so I could get it to compile. The result was all that unsupported nonsense which just added to my misery.

I'm stuck at getting the full JPanel or JFrame to show. As it runs now only the title bar of it displays.
Ulf Dittmer
Marshal

Joined: Mar 22, 2005
Posts: 39547
    
  27
I don't see code that would add a JPanel (or anything, actually) to the JFrame. That the JFrame is sized to essentially nothing is because of the "pack" call - if a frame is empty, then there's no need for it to take up space.
Campbell Ritchie
Sheriff

Joined: Oct 13, 2005
Posts: 36478
    
  16
If you create a method and don't write anything in it, NetBeans will write "throw new UnsupportedOperationException();" which is useful for method which you intend to implement later. When you have interfaces and wish to leave some of the methods blank, as you have found the hard way ( ) it doesn't help.
 
It is sorta covered in the JavaRanch Style Guide.
 
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