Error in code can't find what is wrong
Hello I have this class in my program in my main class I have button and if I press
that button I want the program to do test() from class BeltPanel but only that.
I tried it with this new BeltPanel().test(g);
but then I receive a lot of errors.
What is wrong with the code??
CODE
class BeltPanel extends JPanel
public BeltPanel()
// Code for adding buttons
public void test(Graphics g)
super.paint(g);
g.setColor(Color.white);
g.drawRect(501,32,191,20);
g.setColor(Color.gray);
g.drawRect(500,31,190,20);
progbar.teken(g);
ERRORS
java.lang.NullPointerException
at program.beltableaupack.beltableau$BeltPanel.test(beltableau.java:309)
at program.beltableaupack.beltableau$menu2KnopHandler.actionPerformed(beltableau.java:1072)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1786)
at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1839)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
at javax.swing.AbstractButton.doClick(AbstractButton.java:289)
at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1113)
at javax.swing.plaf.basic.BasicMenuItemUI$MouseInputHandler.mouseReleased(BasicMenuItemUI.java:943)
at java.awt.Component.processMouseEvent(Component.java:5100)
at java.awt.Component.processEvent(Component.java:4897)
at java.awt.Container.processEvent(Container.java:1569)
at java.awt.Component.dispatchEventImpl(Component.java:3615)
at java.awt.Container.dispatchEventImpl(Container.java:1627)
at java.awt.Component.dispatchEvent(Component.java:3477)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3483)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3198)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3128)
at java.awt.Container.dispatchEventImpl(Container.java:1613)
at java.awt.Window.dispatchEventImpl(Window.java:1606)
at java.awt.Component.dispatchEvent(Component.java:3477)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:456)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)
> java.lang.NullPointerException
at program.beltableaupack.beltableau$BeltPanel.test(beltableau.java:309)
at program.beltableaupack.beltableau$menu2KnopHandler.actionPerformed(beltableau.java:1072)A few remarks:1) where did you get your Graphics object reference from in your
ActionListener? 2) your classes are waay too big (more than 1800 lines ...)
kind regards,
Jos
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