import javax.swing.JFrame;

import javax.swing.JPanel;

import java.awt.Graphics;



public class DrawArcs extends JFrame {

  public DrawArcs() {

    setTitle("DrawArcs");

    add(new ArcsPanel());

  }



  /** Main method */

  public static void main(String[] args) {

    DrawArcs frame = new DrawArcs();

    frame.setLocationRelativeTo(null); // Center the frame
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    frame.setSize(250, 300);

    frame.setVisible(true);

  }

}



// The class for drawing arcs on a panel
class ArcsPanel extends JPanel {

  // Draw four blazes of a fan
  protected void paintComponent(Graphics g) {

    super.paintComponent(g);



    int xCenter = getWidth() / 2;

    int yCenter = getHeight() / 2;

    int radius = (int)(Math.min(getWidth(), getHeight()) * 0.4);



    int x = xCenter - radius;

    int y = yCenter - radius;



    g.fillArc(x, y, 2 * radius, 2 * radius, 0, 30);

    g.fillArc(x, y, 2 * radius, 2 * radius, 90, 30);

    g.fillArc(x, y, 2 * radius, 2 * radius, 180, 30);

    g.fillArc(x, y, 2 * radius, 2 * radius, 270, 30);

  }

}