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Updating JLabel shows the preious text behind.

3 replies on 1 page. Most recent reply: Mar 24, 2005 4:39 AM by andy

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andy

Posts: 6
Nickname: chant9
Registered: Mar, 2005

Updating JLabel shows the preious text behind.

Posted: Mar 23, 2005 12:02 PM

Hi
I have a button that updates a JLabel. The problem is whenever i update the JLabel it simply writes over what was previously there and and you can see the previous text behind it.
Below is the code used.

jLabel8 = new JLabel(graph.getScale() * 100 + " %");

zoomPanel.add(jLabel8);
zoomPanel.validate();
zoomPanel.revalidate();
zoomPanel.repaint();

Does anyone know of a better way of doing it or is there a way of removing the previous text.

Any help will be apprieciated.

Thanks

Amol Brid

Posts: 43
Nickname: amolbrid
Registered: Feb, 2004

Re: Updating JLabel shows the preious text behind.

Posted: Mar 23, 2005 9:34 PM

Hi,

No need to do validate()/revalidate()/repaint(). Just create a label and change its text in the action listener of button.

lblMsg = new JLabel("Old text");
.
.
.
// in button action listener
lblMsg.setText("New text");

Regards,
Amol Brid.

Matthias Neumair

Posts: 660
Nickname: neumi
Registered: Sep, 2003

Re: Updating JLabel shows the preious text behind.

Posted: Mar 23, 2005 11:26 PM

Amol's solution is right.

But you surely want to know why your solution doesn't work, right?

The reason is, that jLabel8 is not a label, but a reference to a label

What happened?

1.) jLabel8 = new JLabel("text1);

This creates a new Label, let's call it labelA and puts a reference to it into jLabel8.

2.) zoomPanel.add(jLabel8);

This adds labelA to zoomPanel

3.) jLabel8 = new JLabel("text2);

This creates a new Label, let's call it labelB and puts a reference to it into jLabel8. But labelA is not affected by this operation.

4.) zoomPanel.add(jLabel8);

This adds labelB to zoomPanel. labelA still remains in zoomPanel.

andy

Posts: 6
Nickname: chant9
Registered: Mar, 2005

Re: Updating JLabel shows the preious text behind.

Posted: Mar 24, 2005 4:39 AM

Thanks a lot for the help, its working now.

Cheers.

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