Is there another way to remove all items of a JComboBox then removeAllItems()?

Question

Is there another way to remove all items of a JComboBox then removeAllItems()? I use 2 JComboBoxes in mij app and when you select an item from the first combobox the related items should then be shown in the second combobox. When I do this, the items just keep appending after the ones that were already there. When I then first try to clear the combobox by using removeAllItems(), the second combobox is empty and stays empty whenever I change the first combobox... The first combobox keeps all its values... Does anyone see my problem?

festival is the JComboBox:

private JComboBox festival;
private JComboBox zone;

...

public void fillFestivalList(){
    festival.removeAllItems();
    List festivals = OP.fillFestivalList();

    for(Object fest: festivals)
        festival.addItem(fest.toString());
}

public void fillZoneList(String festival){
    zone.removeAllItems();
    List zones = OP.fillZoneList(festival);

    for(Object zoneItem: zones)
        zone.addItem(zoneItem.toString());
}

Clearly either this isn't the real code or you are calling the wrong method. — user207421, Oct 29 '13 at 22:16
I have just copied the parts that I tought were necessary.. If you want I can add the code you need to solve the problem — Maarten Meeusen, Oct 29 '13 at 22:32

score 4 · Accepted Answer · answered Oct 29 '13 at 21:52

4

Regarding,

Is there another way to remove all items of a JComboBox then removeAllItems()?

Simply give the JComboBox a new model.

I would create a new DefaultComboBoxModel<T>, fill it with the newest entries, and then call setModel(...) on my JComboBox, passing in the new model when desired.

answered Oct 29 '13 at 21:52

Hovercraft Full Of Eels

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So instead of adding the items to the JComboBox zone, I should add them to DefaultComboBoxModel zoneModel and then do zone.setModel(zoneModel)? – Maarten Meeusen Oct 29 '13 at 22:27
+1, @MaartenMeeusen see http://stackoverflow.com/a/5605775/131872 for a simple example – camickr Oct 29 '13 at 22:34

Deepak Odedara · Answer 2 · 2013-10-30T05:01:59.620

2

You can also Remove all the items in this way , but better to Give JCombobox a new DefaultComboBoxModel like the way @Hovercraft Full Of Eels said

 int itemCount = combo.getItemCount();

        for(int i=0;i<itemCount;i++){
            combo.removeItemAt(0);
         }

edited Oct 30 '13 at 05:01

answered Oct 30 '13 at 04:34

Deepak Odedara

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Is there another way to remove all items of a JComboBox then removeAllItems()?

2 Answers2