Java Code:
import java.awt.Color;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Ellipse2D;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class SimplestGradientPaint extends JPanel{
  public static void main(String[] args) {
    JFrame f = new JFrame();
    f.getContentPane().add(new SimplestGradientPaint());
    f.setSize(350, 250);
    f.show();

  }

  public void paint(Graphics g) {
    Graphics2D g2 = (Graphics2D) g;
    Ellipse2D e = new Ellipse2D.Float(40, 40, 120, 120);
    GradientPaint gp = new GradientPaint(75, 75, Color.white, 95, 95,
        Color.gray, true);
    g2.setPaint(gp);
    g2.fill(e);
  }
}