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

public class Ellipse2DTest2 extends JPanel{

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

    Ellipse2DTest2 app = new Ellipse2DTest2();
    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);

    Ellipse2D.Double ellipse = new Ellipse2D.Double();
    ellipse.setFrame(30.0d, 30.0d, 150.0d, 80.0d);

    g2.draw(ellipse);

    double x = ellipse.getX();
    double y = ellipse.getY();
    double w = ellipse.getWidth();
    double h = ellipse.getHeight();

    g2.draw(new Rectangle2D.Double(x, y, w, h));
  }
}