How to create a simple list program using java!

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// Demonstrate a simple JList.

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

class ListDemo implements ListSelectionListener {
 JList jlst;
 JLabel jlab;
 JScrollPane jscrlp;

 // Create an array of names.
 String names[] = {"Sherry", "Jon", "Rachel", "Sasha", "Josselyn", "Randy", "Tom", "Mary", "Ken", "Andrew", "Matt", "Todd"};
 
 ListDemo() {
  // Create a new JFrame container.
  JFrame jfrm = new JFrame("JList Demo");
  
  // Specify a flow Layout.
  jfrm.setLayout(new FlowLayout());

  // Give the frame an initial size.
  jfrm.setSize(200, 160);

  // Terminate the program when the user closes the application.
  jfrm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

  // Create a JList.
  jlst = new JList(names);

  // Set the list selectin mode to single-selection.
  jlst.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);

  // Add list to a scroll pane.
  jscrlp = new JScrollPane(jlst);

  // Set the preffered size of the scroll pane.
  jscrlp.setPreferredSize(new Dimension(120,90));

  // set a label that displays the selection.
  jlab = new JLabel("Please choose a name");

  // Add ist selectin handler.
  jlst.addListSelectionListener(this);

  // Add the list and the label to the content pane.
  jfrm.add(jscrlp);
  jfrm.add(jlab);

  // Display the frame.
  jfrm.setVisible(true); 
  
 }

 // Handle the list selection events.
 public void valueChanged(ListSelectionEvent le) {
  // Get the index of the changed item.
  int idx = jlst.getSelectedIndex();

  // Display selection, if item was selected.
  if(idx != -1)
   jlab.setText("Current selection: " + names[idx]);
  else // Otherwise, reprompt.
   jlab.setText("Please choose a name");
 } 

 public static void main(String args[]) {
  // Create the frame on the event dispatching thread.
  SwingUtilities.invokeLater(new Runnable() {
   public void run() {
    new ListDemo();
   }
  });
 }
}