How do you edit an element by index in a JList?

Question

How to set the text/name of a JList element in Java Swing?

I have created a list with 5 list elements.

When I do:

int currentIndex = list.getSelectedIndex();

I take the index of the current element. I would like to edit/modify the Text of the current element index. Is there any method for that?

e.g.

list.setText(CurrentIndex,"new text")

Answer 1

Use the DefaultListModel. It has the method setElementAt(E element, int index) and add(int index, E element)

• setElementAt(E element, int index) - Sets the component at the specified index of this list to be the specified element. The previous component at that position is discarded.

• add(int index, E element) - Inserts the specified element at the specified position in this list.

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You can initialize your JList with a DefaultListModel and then use all of the DefaultListModels methods

DefaultListModel model = new DefaultListModel();
JList list = new JList(model);

Then just use its methods

model.setElementAt("new text", index);
model.add(index, "new text");

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See: DefaultListModel javadoc for more methods | How to use Lists tutorial

Answer 2

//mouse click event

private void jListClientFileHeaderMappedMouseClicked(java.awt.event.MouseEvent evt) { // TODO add your handling code here:

    JList<String> theList = (JList) evt.getSource();
    if (evt.getClickCount() == 2) { //

        JFrame frame = new JFrame();

        int index = theList.locationToIndex(evt.getPoint());
        if (index >= 0) {

            final JList list = ((JList) (evt.getComponent()));
            if (list.getSelectedIndex() != -1) {
                int i = list.getSelectedIndex();
                System.out.println(list.getSelectedIndex());
                DefaultListModel<String> listModel = (DefaultListModel<String>) jListClientFileHeaderMapped.getModel();
                Object result = JOptionPane.showInputDialog(frame, "value:");
                System.out.println(result);
                listModel.remove(i); //remove jlist item value 
                listModel.add(i, result.toString()); //add dialog text value

            }
        }
    }

}