Código de Java - Dibujar un arco relleno

import java.awt.*;

import javax.swing.*;

import java.awt.geom.*;

public class FillArc extends JPanel {

  public void paintComponent(Graphics g) {

    Graphics2D g2 = (Graphics2D) g;

    // fill Arc2D

    g2.setPaint(Color.red);

    g2.fill(new Arc2D.Double(20, 20, 200, 100, 90, 180, Arc2D.OPEN));

  }

  public static void main(String[] args) {

    JFrame.setDefaultLookAndFeelDecorated(true);

    JFrame frame = new JFrame("Fill Arc Example ");

    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    frame.setBackground(Color.white);

    frame.setSize(300, 200);

    FillArc panel = new FillArc();

    frame.add(panel);

    frame.setVisible(true);

  }

}