Refreshing the contents of a JList

JListExample.java:

 
// Created with JBuilder (c) Philip Craiger
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
 
/**
 * Title:        A JList Programming Example
 * Description:
 * Copyright:    Copyright (c) 2001
 * Company:
 * @author Dr. Philip Craiger
 * @version 1.0
 */
 
public class JListExample extends JFrame {
  private JButton btnMove = new JButton();
  private JButton bthRemove = new JButton();
 
  // Model View Controller: We change contents of the JList through
  // manipulation of a MODEL, not the actual JList.
  
 
  private DefaultListModel model_1 = new DefaultListModel();
  private DefaultListModel model_2 = new DefaultListModel();
 
  private JList jList1 = new JList(model_2);
  private JList jList2 = new JList(model_1);
  
  // JLists do not scroll by default.  We need to add them to
  // an encompassing JScrollPane
  private JScrollPane jScrollPane1 = new JScrollPane();
  private JScrollPane jScrollPane2 = new JScrollPane();
 
  public JListExample() {     // our constructor
    super("A JList Example"); // call to super constructor
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
 
  public static void main(String[] args) {
    JListExample foo = new JListExample();
    foo.setSize(new Dimension(450,200));
    foo.show();
  }
 
  private void jbInit() throws Exception {
 
  // Note we are adding and removing JList items from the MODEL
  // NOT directly from the JList.  Because JList is associated with the
  // model, the JList contents are updated automatically
 
    model_1.addElement("Java");
    model_1.addElement("Visual Basic");
    model_1.addElement("C++");
    model_1.addElement("C");
    model_1.addElement("Common LISP");
    model_1.addElement("Fortran");
    model_1.addElement("Pascal");
    model_1.addElement("Python");
    this.getContentPane().setLayout(null);
 
    btnMove.setText("Move >>");
    btnMove.setBounds(new Rectangle(150, 35, 98, 36));
    btnMove.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        btnMove_actionPerformed(e);
      }
    });
 
    bthRemove.setText("<< Remove");
    bthRemove.setBounds(new Rectangle(152, 87, 97, 36));
    bthRemove.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        bthRemove_actionPerformed(e);
      }
    });
 
    jScrollPane1.setBounds(new Rectangle(286, 15, 109, 133));
    jScrollPane2.setBounds(new Rectangle(14, 15, 106, 136));
 
    // Allow user to select a single item from JList
    jList1.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
    jList2.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
 
    this.getContentPane().add(jScrollPane2, null);
    jScrollPane2.getViewport().add(jList2, null); // Must add JList
    this.getContentPane().add(jScrollPane1, null); // to a JScrollPane
    this.getContentPane().add(btnMove, null);
    this.getContentPane().add(bthRemove, null);
    jScrollPane1.getViewport().add(jList1, null); // JList to JScrollPane
    jList2.setSelectedIndex(0);
  }
 
  void btnMove_actionPerformed(ActionEvent e) {
    model_2.addElement(jList2.getSelectedValue());  // change the MODEL
    model_1.removeElement(jList2.getSelectedValue());  // change the MODEL
    jList2.setSelectedIndex(0);       // Highlight first item in JList
  }
 
  void bthRemove_actionPerformed(ActionEvent e) {
    model_1.addElement(jList1.getSelectedValue());  // change the MODEL
    model_2.removeElement(jList1.getSelectedValue()); // change the MODEL
    jList2.setSelectedIndex(0);       // Highlight first item in JList
  }
}