Exception thrown when I remove and add Tab?
Hi,
I use the JTabbedPane, and I made a button, when it's pressed, it will remove all tab from the JTabbedPane, and then it will recreate every tab(update them) and add it back. But sometimes there's exception thrown, why is that? the exception are:
java.lang.ArrayIndexOutOfBoundsException: 4 <------------------- this number always change
at javax.swing.plaf.basic.BasicTabbedPaneUI.paintTabArea(BasicTabbedPaneUI.java:535)
at javax.swing.plaf.basic.BasicTabbedPaneUI.paint(BasicTabbedPaneUI.java:497)
at javax.swing.plaf.metal.MetalTabbedPaneUI.paint(MetalTabbedPaneUI.java:666)
at javax.swing.plaf.metal.MetalTabbedPaneUI.update(MetalTabbedPaneUI.java:561)
at javax.swing.JComponent.paintComponent(JComponent.java:541)
at javax.swing.JComponent.paint(JComponent.java:808)
at javax.swing.JComponent.paintChildren(JComponent.java:647)
at javax.swing.JComponent.paint(JComponent.java:817)
at javax.swing.JComponent.paintWithOffscreenBuffer(JComponent.java:4795)
at javax.swing.JComponent.paintDoubleBuffered(JComponent.java:4748)
at javax.swing.JComponent._paintImmediately(JComponent.java:4692)
at javax.swing.JComponent.paintImmediately(JComponent.java:4495)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:410)
at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:117)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:178)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:454)
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)
Does anyone know why? Thx
Adrian
Does anyone know why? I still can't solve this problem, it just keep popping up, but the strange thing is after exception thrown, nothing has happeded, everything seems to be fine, the program still running, all those tabs are added.
Does anyone know why?
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tonyMrsangelo.I never had any problem with revalidate.I still don't understand the difference between validate() and revalidate(). The vast majority of time they are interchangeable and a repaint() is not required. However, I have noticed a few cases where validate() works and revalidate() doesn't (and vice-versa). I have also noticed a few cases where repaint() is required. Of course I can't remember all the situations, but here are a couple of examples showing problems:
This posting shows a repaint() is required when removing a single component:
[http://forums.sun.com/thread.jspa?forumID=31&threadID=789317&start=8]
And this posting shows a repaint() is required when removing and adding a component (but only if the last component in the container is removed and added)
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class ValidateTest extends JFrame implements ActionListener
JComponent north;
int number;
public ValidateTest()
north = new JPanel();
getContentPane().add( north, BorderLayout.NORTH );
north.add( new JButton("Button1") );
north.add( new JButton("Button2") );
north.add( new JButton("Button3") );
north.add( new JButton("Button4") );
JPanel south = new JPanel();
getContentPane().add( south, BorderLayout.SOUTH );
JButton validate = new JButton("Validate");
validate.addActionListener( this );
JButton revalidate = new JButton("Revalidate");
revalidate.addActionListener( this );
JButton repaint = new JButton("Repaint");
repaint.addActionListener( this );
south.add( validate );
south.add( revalidate );
south.add( repaint );
public void actionPerformed(ActionEvent e)
// repaint() is needed in this case
int position = 3;
// repaint is not needed in this case
// int position = 0;
north.add( new JButton( "" + number++), position );
String command = e.getActionCommand();
if ("Validate".equals(command))
north.validate();
else if ("Revalidate".equals(command))
north.revalidate();
else
north.repaint();
public static void main(String[] args)
JFrame frame = new ValidateTest();
frame.setDefaultCloseOperation( EXIT_ON_CLOSE );
frame.setSize(500, 200);
frame.setLocationRelativeTo( null );
frame.setVisible(true);
You can even see in the JScrollPane tutorial they use revalidate without repaint when resizing the client area. I think, the key here is the "resizing" seems to automatically cause the area to be repainted.
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