Oliver Oliver - 2 months ago 8
Java Question

How to create several Jlists with different values with DefaultListModel

I have a problem with my code.
I have a multidimensional String array[][] and want to create lists out of it.
So for each array[] element, I want a new list with it's values. So for example I had 4 lists. List 1 hat 3 values, list 2 had 1 value, list 3 has 4 values and list 4 has 2 values.
This worked fine when I just used JList. There I have for each value of the array all of its value.:

protected static JComponent getButtonCluster() {
contentPanel.removeAll();
contentPanel.setLayout(new GridLayout(0,2, 5, 5));
contentPanel.setBorder(new EmptyBorder(10,0,0,0));
for (int i=0; i < StringArray.length; i++) {
listbox = new JList( StringArray[i] );
contentPanel.add(listbox);
}
return contentPanel;
}


But now I had to change from only JLists to DefaultListModel because I want to change the Values by clicking on the Values.
And now ALL lists have ALL values of the array. So all 4 boxes have 10 elements.

final DefaultListModel<String> model = new DefaultListModel<String>();
for (int i=0; i < StringArray.length; i++) {
for (int j=0; j < StringArray[i].length; j++) {
model.addElement(StringArray[i][j]);

if((StringArray[i].length -1)== j) {
listbox = new JList<String>(model);
contentPanel.add(listbox);

listbox.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
if (e.getClickCount() == 2) {
//Value Change part.......
}
}
});
}
}


How can I fix my problem so that each list has it's own values?

Answer

Previously you were creating a new JList in each pass through your loop. In your new code you're not creating a new model with each pass through the loop so you're just adding more to the existing model every time.

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