I have 2 JLists. How can I find which JList user clicked?

Below is the code. It can move the names from
the left to the right if you click the name. How can I move the name
from the right to left? Thank you very much.

import java.awt.*;
import javax.swing.event.*;
import javax.swing.*;


public class List2 implements ListSelectionListener
{
JList l1,l2;
DefaultListModel model1 = new DefaultListModel();
DefaultListModel model2 = new DefaultListModel();
public static void main(String[] args) {
JFrame f = new JFrame("Lister v1.0");
List2 l=new List2();
f.setSize(200, 200);
f.setLocation(200, 200);
Container c = f.getContentPane();
GridLayout grd = new GridLayout(1,2,10,10);
c.setLayout(grd);
l.create();
c.add(l.l1);
c.add(l.l2);
f.setVisible(true);
}


public void valueChanged(ListSelectionEvent e){
Object selection = l1.getSelectedValue();
if (l1.getSelectedIndex()>=0){
model2.addElement(selection);
model1.removeElementAt(l1.getSelectedIndex());
}}


private void create(){
l1 = new JList(model1);
l2 = new JList(model2);
model1.addElement("Mark");
model1.addElement("Mary");
model1.addElement("Mike");
l1.addListSelectionListener(this);
}}

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