import javax.swing.*;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.geom.*;

public class Arc2DTest1 extends JPanel{

  public static void main(String[] args){
    JFrame frame = new JFrame();

    Arc2DTest1 app = new Arc2DTest1();
    frame.getContentPane().add(app);

    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setBounds(10, 10, 300, 200);
    frame.setTitle("ƒ^ƒCƒgƒ‹");
    frame.setVisible(true);
  }

  public void paintComponent(Graphics g){
    Graphics2D g2 = (Graphics2D)g;

    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, 
                        RenderingHints.VALUE_ANTIALIAS_ON);

    Arc2D.Double arc = new Arc2D.Double();
    arc.setArc(20.0d, 20.0d, 250.0d, 140.0d, 45.0d, 45.0d, Arc2D.PIE);

    g2.draw(arc);
  }
}