Introduction to Programming with Java Applets (Boese)

Lab: Chapter 8

The purpose of this assignment is


You get to write a "Simon Says" game! This version is based on the kids game where players click on one of the four colors, then have to do what ever Simon says to do!

For example, Simon might say "Put your hands on your head!" or "Touch your toes!"

The overall game is shown below:

This program is made up of
a JLabel for the title at the top,
An image
and a JTextArea for displaying the messages.
Link to image file: Right-click on the image, and choose "Save Target As.."
Then import into Eclipse following the import instructions in WebCT.


  1. The first step is to get everything displayed right (worry about the events later).

  2. Create a new class named SimonSays, adding the import statements and an init method.

  3. At the top of the program, we want to add our instance variables. The following variables we need:

  4. Create a method called doTitle that takes no parameters and returns nothing.
    Inside this method, set up the title with a font size 20, centered, color is yellow and background is black (to get the background color, put the title JLabel in to a JPanel and set the background on this JPanel).
    Add the JPanel to the applet in the north.

  5. Create a method called doBottom that takes no parameters and returns nothing.
    Inside this method, set up the JTextArea with a black background, white text, and a font size 14.
    Initialize the text to say:
    Welcome to Simon Says!
    To play, click on a color 
    and follow the instructions.
    Make sure it displays on multiple lines!! (Remember the escape sequence for new lines?)
    Add it to the applet in the south.

  6. Create a method called doCenter that takes no parameters and returns nothing.

  7. Inside this method,

  8. Inside the init method,

  9. Run the applet now and ensure that it looks correctly, just like the first image at the top of these instructions.

  10. Now we can add events to our mouse clicks to make our applet more exciting. To get events to work, we're going to use the MouseListener to listen for mouse events.

  11. Now we can customize what happens when each region is clicked. Inside a proper one of the MouseListener methods, set up if-else statements for each of the regions, and print to the console window the color of the region that was clicked.

  12. Once that works, change it to change the text in the JTextArea based on the following rules:
    	If the red button was clicked,
    		display "Simon says, Put your hands on your head!"
    	otherwise if the green button was clicked,
    		display "Simon says, Touch your toes!"
    	otherwise if the blue button was clicked,
    		display "Simon says, Jump 10 times on your right foot!"
    	otherwise if the yellow button was clicked,
    		display "Simon says, Quack like a duck!"

  13. Run and test your program and ensure this is all working so far.

  14. Now we're going to add some unpredictability to the program using a randomizer.

  15. Now add some randomness to one of the other regions! Follow the same steps from when we started adding code inside the if statement for the red region, using the same random object.

 * CS150 Spring 2008 (Lab9)
 * Author: 
 * Date: 

import java.awt.*;
import javax.swing.*;
import java.util.*;				//for Random

public class SimonSays extends JApplet 

   // define variables:
   JLabel    title;
   public void init( )
        setLayout( new BorderLayout() );

	//Call the functions

   public void doTitle( )
	title = new JLabel( "Simon Says", JLabel.CENTER );
	title.setFont( new Font("Serif", Font.BOLD, 20 ) );
	title.setForeground( Color.YELLOW );
	JPanel titlePanel = new JPanel( );
	titlePanel.setBackground( Color.BLACK );
	add( titlePanel, BorderLayout.NORTH );
   public void doBottom( )

   public void doCenter( )


   // implementation for MouseListener
   public void mouseClicked(MouseEvent me)
	    int x = me.getX();
	    int y = me.getY();

	    //if mouse pointer is located in upper left 

	    //else if mouse pointer is located in upper right 

	    //else if mouse pointer is located in down left 

	    //else if mouse pointer is located in down right 

}//End of Class

When you are finished, show your GTA for credit for this lab exercise.
© by E.S.Boese. All Rights Reserved