Selecting an item twice in JList

Question

Hy,
I have create a JList with some animal's name in it. When I click on one of the animal's
name for the FIRST time, it appears in a JTextArea.
What I want is that when I click on that same name consecutively, it appears again in that
JTextArea. Can anyone please send me the code for doing that. Its very urgent.
Here are my code:
import javax.swing.*;
import javax.swing.text.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
public class PropertyWindow extends JFrame implements ListSelectionListener, ActionListener {
     private JList list;
     private JScrollPane scrollTextArea;
     private JTextArea textArea;
     private String text;
     private Vector imageNames;
     private JLabel picture;
     private DefaultListModel listModel;
     public PropertyWindow () {
          super("Property Window");
          //create a text area
          textArea = new JTextArea();
          textArea.setFont(new Font("Arial", Font.PLAIN, 16));
          textArea.setLineWrap(true);
          textArea.setWrapStyleWord(true);
          //create a scrollpane and add it to the text area
          scrollTextArea = new JScrollPane(textArea);
          scrollTextArea.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
          scrollTextArea.setPreferredSize(new Dimension(200,35));
          //create a list of button and add it to the JPanel
          JButton addButton = new JButton("+");
          JButton subtractButton = new JButton("-");
          JButton multiplyButton = new JButton("x");
          JButton divideButton = new JButton("/");
          JButton assignButton = new JButton("=");
          JButton equalButton = new JButton("= =");
          JButton greaterButton = new JButton(">");
          JButton G_EqualButton = new JButton("> =");
          JButton lessButton = new JButton("<");
          JButton L_EqualButton = new JButton("< =");
          JButton notEqualButton = new JButton("! =");
          JButton oneButton = new JButton("1");
          JButton twoButton = new JButton("2");
          JButton threeButton = new JButton("3");
          JButton fourButton = new JButton("4");
          JButton fiveButton = new JButton("5");
          JButton sixButton = new JButton("6");
          JButton sevenButton = new JButton("7");
          JButton eightButton = new JButton("8");
          JButton nineButton = new JButton("9");
          JButton zeroButton = new JButton("0");
          addButton.setActionCommand ("+");
          subtractButton.setActionCommand("-");
          multiplyButton.setActionCommand("x");
          divideButton.setActionCommand ("/");
          assignButton.setActionCommand ("=");
          equalButton.setActionCommand ("= =");
          greaterButton.setActionCommand (">");
          G_EqualButton.setActionCommand ("> =");
          lessButton.setActionCommand ("<");
          L_EqualButton.setActionCommand ("< =");
          notEqualButton.setActionCommand("! =");
          oneButton.setActionCommand ("1");
          twoButton.setActionCommand ("2");
          threeButton.setActionCommand ("3");
          fourButton.setActionCommand ("4");
          fiveButton.setActionCommand ("5");
          sixButton.setActionCommand ("6");
          sevenButton.setActionCommand ("7");
          eightButton.setActionCommand ("8");
          nineButton.setActionCommand ("9");
          zeroButton.setActionCommand ("0");
          JPanel buttonPane = new JPanel();
          buttonPane.setBorder(
                                        BorderFactory.createCompoundBorder(
                                   BorderFactory.createCompoundBorder(
                              BorderFactory.createTitledBorder("Arithmetic/Logical Operations"),
                              BorderFactory.createEmptyBorder(5,5,5,5)),
                                   buttonPane.getBorder()));
          buttonPane.setLayout(new GridLayout (3,7));
          buttonPane.add(addButton);
          buttonPane.add(subtractButton);
          buttonPane.add(multiplyButton);
          buttonPane.add(divideButton);
          buttonPane.add(assignButton);
          buttonPane.add(equalButton);
          buttonPane.add(greaterButton);
          buttonPane.add(G_EqualButton);
          buttonPane.add(lessButton);
          buttonPane.add(L_EqualButton);
          buttonPane.add(notEqualButton);
          buttonPane.add(oneButton);
          buttonPane.add(twoButton);
          buttonPane.add(threeButton);
          buttonPane.add(fourButton);
          buttonPane.add(fiveButton);
          buttonPane.add(sixButton);
          buttonPane.add(sevenButton);
          buttonPane.add(eightButton);
          buttonPane.add(nineButton);
          buttonPane.add(zeroButton);
          addButton.addActionListener(this);
          subtractButton.addActionListener(this);
          multiplyButton.addActionListener(this);
          divideButton.addActionListener(this);
          assignButton.addActionListener(this);
          equalButton.addActionListener(this);
          greaterButton.addActionListener(this);
          G_EqualButton.addActionListener(this);
          lessButton.addActionListener(this);
          L_EqualButton.addActionListener(this);
          notEqualButton.addActionListener(this);
          oneButton.addActionListener(this);
          twoButton.addActionListener(this);
          threeButton.addActionListener(this);
          fourButton.addActionListener(this);
          fiveButton.addActionListener(this);
          sixButton.addActionListener(this);
          sevenButton.addActionListener(this);
          eightButton.addActionListener(this);
          nineButton.addActionListener(this);
          zeroButton.addActionListener(this);
          //create the 'ok' and 'cancel' button
          JButton okButton = new JButton("Ok");
          JButton cancelButton = new JButton("Cancel");
          okButton.setActionCommand("Ok");
          okButton.addActionListener(this);
          cancelButton.setActionCommand("Cancel");
          cancelButton.addActionListener(this);
          JPanel controlPane = new JPanel();
          controlPane.setLayout(new FlowLayout());
          controlPane.add(okButton);
          controlPane.add(cancelButton);
          //create a Jlist where to insert variables
          listModel = new DefaultListModel();
listModel.addElement("dog");
listModel.addElement("cat");
listModel.addElement("rat");
listModel.addElement("rabbit");
listModel.addElement("cow");
          list = new JList(listModel);
          list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
          //list.setSelectedIndex(0);
          list.addListSelectionListener(this);
          JScrollPane scrollList = new JScrollPane(list);
          scrollList.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
          scrollList.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
scrollList.setPreferredSize(new Dimension(200,300));
          scrollList.setBorder(
                                        BorderFactory.createCompoundBorder(
                                   BorderFactory.createCompoundBorder(
                    BorderFactory.createTitledBorder("Variables"),
                    BorderFactory.createEmptyBorder(5,5,5,5)),
                                   scrollList.getBorder()));
          //create a pane and put the scroll list and ok/cancel button in it
          JPanel rightPane = new JPanel();
          BoxLayout rightBox = new BoxLayout(rightPane, BoxLayout.Y_AXIS);
          rightPane.setLayout(rightBox);
          rightPane.add(scrollList);
          rightPane.add(controlPane);
          //create a pane and put the scroll text area and arithmetic button in it
          JPanel leftPane = new JPanel();
          BoxLayout leftBox = new BoxLayout(leftPane, BoxLayout.Y_AXIS);
          leftPane.setLayout(leftBox);
          leftPane.add(scrollTextArea);
          leftPane.add(buttonPane);
          //add both pane to the container
          JPanel contentPane = new JPanel();
          BoxLayout box = new BoxLayout(contentPane, BoxLayout.X_AXIS);
          contentPane.setLayout(box);
          contentPane.add(leftPane);
          contentPane.add(rightPane);
setContentPane(contentPane);
     public void valueChanged(ListSelectionEvent e) {
     if (e.getValueIsAdjusting() == false) {
     if (list.getSelectedIndex() == -1) {
          //No selection, disable fire button.
     else {
          //Selection, update text field.
     String name = list.getSelectedValue().toString();
     textArea.append(" " + name + " ");
     public void actionPerformed(ActionEvent e) {
          String cmd = e.getActionCommand();
          if (cmd.equals("Ok")) {
               // save current textarea
               text = textArea.getText();
               System.out.println(text);
               dispose();
               setVisible(false);
          if (cmd.equals("Cancel")) {
               dispose();
               setVisible(false);
          if (cmd.equals("+")) {
               textArea.append(" + ");
          if (cmd.equals("-")) {
               textArea.append(" - ");
          if (cmd.equals("x")) {
               textArea.append(" x ");
          if (cmd.equals("/")) {
               textArea.append(" / ");
          if (cmd.equals("=")) {
               textArea.append(" = ");
          if (cmd.equals("= =")) {
               textArea.append(" == ");
          if (cmd.equals(">")) {
               textArea.append(" > ");
          if (cmd.equals("> =")) {
               textArea.append(" >= ");
          if (cmd.equals("<")) {
               textArea.append(" < ");
          if (cmd.equals("< =")) {
               textArea.append(" <= ");
          if (cmd.equals("! =")) {
               textArea.append(" != ");
          if (cmd.equals("1")) {
               textArea.append("1");
          if (cmd.equals("2")) {
               textArea.append("2");
          if (cmd.equals("3")) {
               textArea.append("3");
          if (cmd.equals("4")) {
               textArea.append("4");
          if (cmd.equals("5")) {
               textArea.append("5");
          if (cmd.equals("6")) {
               textArea.append("6");
          if (cmd.equals("7")) {
               textArea.append("7");
          if (cmd.equals("8")) {
               textArea.append("8");
          if (cmd.equals("9")) {
               textArea.append("9");
          if (cmd.equals("0")) {
               textArea.append("0");
     public static void main(String args []) {
     JFrame frame = new PropertyWindow();
     frame.addWindowListener(new WindowAdapter() {
     public void windowClosing(WindowEvent e) {
     System.exit(0);
     frame.pack();
     frame.setVisible(true);
     frame.setResizable(false);
}

Answer 1

If the whole point of the JList is to display the information in the JTextArea and you don't mind losing the selection in the JList I have a solution for you (just had something similar come up).
Add the following lines in the public void valueChanged(ListSelectionEvent e) method:
listModel = list.getModel();
list.setModel(listModel);
This causes the particular animal in the JList to be un-selected and with each subsequent clicks on that JList selection a new ListSelectionEvent will fire and the text will keep appending.
This gives the effect of a JList just being a bunch of buttons that can be clicked on all you want.