CS205 Notes 36 (15 November 2006)

Project Progress Reports

1. Updated description of your idea and design
   • Explain any changes to your project idea since the design review meeting
   • Explain and justify major changes to your design
2. Clear list of what you have done
   • Include print outs of code for some important modules
   • Explanation of your testing strategy (and how far you have gotten)
3. Plans for completing the project
   • List of what is left to do and how you will do it

Programming GUI Events

public void addActionListener(ActionListener l)
   MODIFIES: this
   EFFECTS: Adds an ActionListener l to the button. 

public void setEnabled(boolean b)
   MODIFIES: this
   EFFECTS: If b, enables this.  Otherwise, disables this.

Anonymous Inner Classes:

   var = new Superclass () {
       // override methods here
   }

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

public class GUI {
   private static void showGUI() {
     JFrame frame = new JFrame("Swing GUI");
     java.awt.Container content = frame.getContentPane();
     content.setLayout(new FlowLayout());
     final JButton onButton = new JButton ("On");
     final JButton offButton = new JButton ("Off");

     ActionListener bl = new ActionListener (){
        public void actionPerformed (ActionEvent e) {
           if (e.getActionCommand().equals ("On")) {
              onButton.setEnabled(false);
              offButton.setEnabled(true);
           } else if (e.getActionCommand().equals("Off")) {
              onButton.setEnabled(true);
              offButton.setEnabled(false);
           }
        }
     };
     onButton.addActionListener(bl);
     offButton.addActionListener(bl);
     offButton.setEnabled(false);
     content.add(onButton);
     content.add(offButton);
     frame.pack();
     frame.setVisible(true);
   }

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

Links

• Buttons, Check Boxes, Radio Buttons