Re: Help with Swing

Try this:

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import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.List;

import javax.swing.Box;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;

public class ZzzMadGUI implements ActionListener {

   public static void main(String[] args) {
     SwingUtilities.invokeLater(new Runnable() {
       public void run() {
         new ZzzMadGUI();
       }
     });
   }

   private List<String> textFieldValues = new ArrayList<String>();
   private JTextField textField;
   private int currentPosition;

   ZzzMadGUI() {
     final Box textBox = Box.createHorizontalBox();
     textField = new JTextField(25);
     JButton upButton = new JButton("UP");
     upButton.addActionListener(this);
     upButton.setActionCommand("UP");
     JButton downButton = new JButton("DOWN");
     downButton.addActionListener(this);
     downButton.setActionCommand("DOWN");
     textFieldValues.add("");
     textBox.add(textField);
     textBox.add(upButton);
     textBox.add(downButton);

     JFrame f = new JFrame("ZzzMadGUI");
     f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     f.add(textBox);
     f.pack();
     f.setLocationRelativeTo(null);
     f.setVisible(true);
   }

   public void actionPerformed(ActionEvent e) {
     if (e.getActionCommand().equals("UP")) {
       textFieldValues.set(currentPosition, textField.getText());

       if (currentPosition == 0) {
         textFieldValues.add(0, "");
       } else
         currentPosition--;

       textField.setText(textFieldValues.get(currentPosition));
     }
     if (e.getActionCommand().equals("DOWN")) {
       textFieldValues.set(currentPosition, textField.getText());

       if (currentPosition == textFieldValues.size() - 1) {
         textFieldValues.add("");
       }
       currentPosition++;

       textField.setText(textFieldValues.get(currentPosition));
     }
   }
}

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The code is far from optimal but I leave it up to you to enhance it.

Stefan