Removing items from JList

Question

I\'ve got a simple Jlist with data from List, Now I want to remove selected item from Jlist. Here is the code:

final DefaultListMo         


        

Answer 1

DefaultListModel model=new DefaultListModel();
    model.clear();
 jList1.setModel(model);

if you want delete all item

Answer 2

According to the javadoc, using remove() instead of removeElementAt() is recommended, so :

public void actionPerformed(ActionEvent arg0) {
    int index = list.getSelectedIndex();
    if (index != -1) {
        model.remove(index);
}

Answer 3

According to the Javadoc for getSelectedIndex():

Returns the smallest selected cell index; the selection when only a single item is selected in the list. When multiple items are selected, it is simply the smallest selected index. Returns -1 if there is no selection

The reason that you're experiencing the error is because for some reason, no items are selected from your list and as such -1 is returned by this method. When you call removeElementAt() and pass it -1 as a parameter value, it would throw you the exception.

What you need to do is as follows:

public void actionPerformed(ActionEvent arg0) {
    int index = list.getSelectedIndex();
    if(index >= 0){ //Remove only if a particular item is selected
        model.removeElementAt(index);
    }
}

Answer 4

Assuming your index is non-negative (as mentioned by others), see if this works (in your listener):

((DefaultListModel) jList.getModel()).remove(index);

If so, then you're using using a stale model.

Answer 5

int selectedIndex = yourJLIST.getSelectedIndex();
    String [] ListData = new String[yourJLIST.getModel().getSize()];
    for (int i = 0; i < ListData.length; i++) {
        if(i == selectedIndex){
            
        }else{
            ListData[i] = yourJLIST.getModel().getElementAt(i);
        }
    }
    yourJLIST.setListData(ListData);

Answer 6

The question is that you have a problem in the listener, because when the element is removed the selected value will change. This is the reason that your "valueChanged" method is trying to get the selectedValue in a wrong position. I can't see your method valueChanged, but I think this is the reason.