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[Java] Removal of JList contents.

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Noz3001
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Posted: Sun Feb 28, 2010 1:23 pm Post subject: [Java] Removal of JList contents.

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I'm trying to create a JList which refreshes every 5 seconds but I can't figure out how to remove all of the items so it keeps adding onto the end.

I managed to do it when I was using JList as a variable, but now I'm using it to extend a class (cleaner code Neutral

Neutral

).

Using this:

Code:

TopicListBox topicListBox = new TopicListBox();
JScrollPane listBoxScrollContainer = new JScrollPane(topicListBox);
add(listBoxScrollContainer);

With this:

Code:

public class TopicListBox extends JList {

Here's the JList I'm talking about.

Any ideas? Danke :S

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HomerSexual
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Posted: Sun Feb 28, 2010 8:35 pm Post subject:

confused as to what you want. Do you just want to delete an item and shift everything up? Show your code to do it when you used JList as a variable? _________________

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pkedpker
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Posted: Mon Mar 01, 2010 2:21 am Post subject:

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well the proper way not sure just googled it.

call

yourJListObject.setListData(new Object[0]);

or create a JList using DefaultListModel

Code:

import.swing.*;
...
DefaultListModel dlm = new DefaultListModel();
yourJListObject = new JList(dlm);

now to add you just use

Code:

dlm.addElement("Post 1 test test");

to delete you can use

Code:

dlm.clear();

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Noz3001
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Posted: Mon Mar 01, 2010 10:09 am Post subject:

I'm using a class which extends JList. I've tried to use this.setModel with a DefaultListModel but the clear method does nothing =\|

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Slugsnack
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Posted: Mon Mar 01, 2010 4:25 pm Post subject:

if you post the full source i can try to have a fiddle around with it

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HomerSexual
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Posted: Tue Mar 02, 2010 6:49 am Post subject:

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Make your own clear method using remove and a loop the size of the DLM length

Quote:

public void clear()
Removes all of the elements from this list. The list will be empty after this call returns (unless it throws an exception).

sounds to me like you just want to empty the list.

Code:

public void clear()
{
for(int i = 0; i < dlm.size(); i++)
dlm.remove(i);
}

Also incorporate try / catch but i was being lazy

As usual, source makes it easier to debug
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