Ten Red Circles Applet

Here is the completed applet. Look over how the named values (constants and variables) were used in computing the values for X and Y.

import java.applet.Applet;
import java.awt.*;

// Assume that the drawing area is 300 by 150.
// Draw ten red circles side-by-side across the drawing area.
public class tenCircles extends Applet
{
  final int width = 300, height = 150;

  public void paint ( Graphics gr )
  { 
    gr.setColor( Color.red );

    int count =  0 ;
    while (  count < 10  )
    {
      int radius = (width/10)/2;      // the diameter is width/10

      int X      = count*(width/10);  // the left edge of each of 10
                                      // squares across the area
      int Y      = height/2 - radius; // the top edge of the squares

      gr.drawOval( X, Y, 2*radius, 2*radius );
      count = count + 1; 
    }

  }
}

Here is what the applet does:

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The arithmetic in the above applet got a little involved. If you got lost, go back to the beginning (use the "back arrow" of the browser.)