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

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);
    }
}