CS 121 - Assignment 3

Computer Science 121
Assignment 3
Due: October 11, 1999

Create a Java applet that will draw three circles similar to those on a traffic light. Their colors should be red, yellow (orange actually looks better) and green. Position them on the applet in the order that they would be for a traffic light. Run the applet from an html file like the one below.

<HTML>
    <HEAD>
        <TITLE>Lights</TITLE>
    </HEAD>
    <BODY>
        <H1>Lights</H1>
        <APPLET CODE="Lights.class" WIDTH=300 HEIGHT=300></APPLET>
    </BODY>
</HTML>

Your applet should have the following form:

// An applet with a class that draws a few circles that look like a traffic light. import java.awt.*; import java.applet.Applet; public class Lights extends Applet
{
private circle redCircle, yellowCircle, greenCircle;

public void init ()
{

        redCircle = new circle ();
        yellowCircle = new circle ();
        greenCircle = new circle ();
    } // method init

    public void paint (Graphics g)
    {
        // Fill in the statements here that would draw the circles.
    } // method paint
} // class shapes

// A class that defines a circle.
class circle
{
    public void displayCircle (Graphics g, Color c, int xPos, int yPos, int diameter)
    {
        // Fill in the statements here that would set the color and draw the circle.
    } // method displayCircle

} // class circle