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Message |
Owyyn
RealPoor Guru
Joined: 11 Oct 2002
Posts: 2900
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 Posted: 12/03/05 - 23:19 Post subject: Help with Java
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I'm making a Keno game for my final project. I'm having a problem that I can't seem to get rid of.
I have 3 classes involved with the problem: Panels, OddsPanel and NumbersPanel. Panels is the parent Class of OddsPanel and NumbersPanel.
Clicking on a button in NumbersPanel should make a call to the updateOdds() method in OddsPanel. I get this error though:
| Code: | Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at NumbersPanel.actionPerformed(NumbersPanel.java:95)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source) |
If anyone feels like helping me I can send the code.... there's too much to be able to post it all here.
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Owyyn
RealPoor Guru
Joined: 11 Oct 2002
Posts: 2900
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Posted: 12/04/05 - 00:54 Post subject:
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Here's some simplified code that represents the same problem:
| Code: | public class Test
{
protected Test2 test2;
protected Test3 test3;
public static void main(String[] args)
{
Test2 test2 = new Test2();
Test3 test3 = new Test3();
}
} |
| Code: | public class Test2 extends Test
{
public Test2()
{}
public String print()
{
return "Weeee";
}
} |
| Code: | public class Test3 extends Test
{
public Test3()
{
System.out.println( test2.print() );
}
} |
Compiles fine but gives runTime errors. =\
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motherface
RealPoor Guru
Joined: 12 Mar 2003
Posts: 3407
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