Java DefaultListSelectionModel() Constructor

public DefaultListSelectionModel()

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
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import javax.swing.DefaultListSelectionModel;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.ListSelectionModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;

public class Main extends JPanel {

  String label[] = { "Zero", "One", "Two" };

  JList list;

  public Main() {
    setLayout(new BorderLayout());

    list = new JList(label);
    JScrollPane pane = new JScrollPane(list);

    DefaultListSelectionModel m = new DefaultListSelectionModel();
    m.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
    m.setLeadAnchorNotificationEnabled(false);
    list.setSelectionModel(m);

    list.addListSelectionListener(new ListSelectionListener() {
      public void valueChanged(ListSelectionEvent e) {
        System.out.println(e.toString());
      }
    });

    add(pane, BorderLayout.NORTH);
  }

  public static void main(String s[]) {
    JFrame frame = new JFrame("List Example");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setContentPane(new Main());
    frame.pack();
    frame.setVisible(true);
  }

}