Hi, odd error in my code with a draw circle method

Question

Hey, I am a first year computer science student who uses java in class.
We have recently been playing with guis
I have created code that when it runs it draws random circles with random gradiants.
However, the code will sometimes draw a random square, any ideas.
import java.io.*;
import java.util.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import javax.imageio.*;
* Class for animations, if I dont finish this lab I will have egg on my face
public class AnimationStation {
     private JFrame frame; //the jframe
     private IView viewer; //the viewer
     * Constructor
     public AnimationStation() {
          frame = new JFrame(); //makes jframe
          viewer = new IView(); //makes iview
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //window closes
          frame.setSize(300, 500); //biggie or smallie
          frame.getContentPane().add(BorderLayout.CENTER,viewer); //place it
          frame.setVisible(true);
     * Main Method
     public static void main(String[] args) {
          AnimationStation cutie = new AnimationStation();
     * The IView inner class
     class IView extends JPanel {
          int x = 0; //x pos
          int y = 0; //w pos
          int d = 0; //diameter
          Color randomColor1; //random color     
          Color randomColor2; // random color
          private boolean imageOn = true; //do we care about the background, or are we looking for that square?
          * Default constructor
          public IView() {
          //wonders... is this neccessary.... ::thinks:: well it works so lets not mess with it
          * Builds our pretty pictures
          public void paintComponent(Graphics g) {
                     g.setColor(Color.white); //make background
                     g.fillRect(0,0,this.getWidth(),this.getHeight()); //background
               for(int x = 0; x < 10; x++) { //no? draw ovals
                         drawOval(g);
          * Method to make ovals
          *(and apparently a random square, although I think its good luck if you do! So its a feature, not a bug)
          public void drawOval(Graphics g) {
               d = (int)((Math.random() * 10) + (this.getWidth() / 5)); //set diameter
               x = (int)(Math.random() * (this.getWidth() - d)); //set x dont let it off the screen
               y = (int)(Math.random() * (this.getHeight() - d)); //set y dont let it off the screen
               randomColor1 = randomColor(); //set random color one
               randomColor2 = randomColor(); //set random color two
               Graphics2D g2d = (Graphics2D) g; //make a graphics 2d object, helps with gradiants
               GradientPaint gradient; //make gradiant
               gradient = new GradientPaint(x, y, randomColor1, x+d, y+d, randomColor2); //set gradiant
               g2d.setPaint(gradient); //set paint
               g2d.fillOval(x,y,d,d); //make that oval
          * Method which makes a random color
          public Color randomColor() {
               Color a = new Color((int)(Math.random() * 255), (int)(Math.random() * 255), (int)(Math.random() * 255));
               return a;
          * Checks to see if a file is an image file (I REALLY hope this is not how other programs do it,
          *  becuase technically I can make this a graphic "mv ImageViewer.java fake.gif")
          public boolean isImageFile(String filename) {
               String ending = "" + filename.charAt(filename.length() - 4) + filename.charAt(filename.length() - 3) + filename.charAt(filename.length() - 2) +
                    filename.charAt(filename.length() - 1); //make a string with the last four letters
               if(ending.equalsIgnoreCase(".jpg") || ending.equalsIgnoreCase(".gif") || ending.equalsIgnoreCase(".bmp")) { //is it an image?
                    return true; //yes
               } else {
                    return false; //no
}thanks,
Bachmann

Answer 1

well, let me explain some more. Its more of an irritation, then a crippling error....
The squares are quite clear. I mean, its not like a small circle that looks squareish, I have seen a square appear and it could be larger than the circles that I see.
It is also very rare, so yeah, it could have something to do with the random aspects.
It just kinda bothers me since nither me, my classmates, or my professor can figure out why this happens and no one else has mentioned this problem.