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

public class PopList extends JWindow 
 implements ListSelectionListener {
    JList<String> lst;
    String[] data= {"one", "two", "three", "four"};
    public PopList() {
        lst = new JList<String>();
        
        lst = new JList<String>(data);
        lst.addListSelectionListener(this);
        add(lst);

        setSize(300, 300);

        // Show the window
        setVisible(true);
        requestFocus();
    }

    public void valueChanged(ListSelectionEvent lse) {
        if(!lse.getValueIsAdjusting()) {
            System.err.println("["+data[lse.getFirstIndex()]+"]");
        }
    }

    public static void main(String args[]) {

        new PopList();
    }
}