Editing a JList in Java. This code repeatedly adds the user “Krang” to a list every time the button is pressed.

editingJLists.java

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    
    DefaultList newList = new DefaultListModel();
        
    ListModel oldList = (ListModel) myList.getModel();
    // Copy over the old list
    for (int i = 0; i < oldList.getSize(); i++) {;
        newList.add(i, oldList.getElementAt(i));
    }
    newList.add(0, "Krang");
    myList.setModel(newList);
}