his Java tips contains a simple application to test the functionality of
the OvalIcon class.

Java Code:
import java.awt.Component;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.Graphics;

import javax.swing.Icon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingConstants;

public class TestOval {
  public static void main(String[] args) {
    JFrame f = new JFrame();
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    JLabel label1 = new JLabel(new OvalIcon(20, 50));
    JLabel label2 = new JLabel(new OvalIcon(50, 20));
    JLabel label3 = new JLabel("Round!", new OvalIcon(60, 60),
        SwingConstants.CENTER);
    label3.setHorizontalTextPosition(SwingConstants.CENTER);

    Container c = f.getContentPane();
    c.setLayout(new FlowLayout());
    c.add(label1);
    c.add(label2);
    c.add(label3);
    f.pack();
    f.setVisible(true);
  }
}

class OvalIcon implements Icon {

  private int width, height;

  public OvalIcon(int w, int h) {
    width = w;
    height = h;
  }

  public void paintIcon(Component c, Graphics g, int x, int y) {
    g.drawOval(x, y, width - 1, height - 1);
  }

  public int getIconWidth() {
    return width;
  }

  public int getIconHeight() {
    return height;
  }
}