Create a Polygon with a loop in Java

import java.awt.Graphics;
import java.awt.Polygon;
//from  ww w  . j a  v a2 s . c o m
import javax.swing.JComponent;
import javax.swing.JFrame;

class MyCanvas extends JComponent {
  public void paint(Graphics g) {
    Polygon p = new Polygon();
    for (int i = 0; i < 5; i++)
      p.addPoint((int) (100 + 50 * Math.cos(i * 2 * Math.PI / 5)),
          (int) (100 + 50 * Math.sin(i * 2 * Math.PI / 5)));

    g.drawPolygon(p);
  }
}

public class Main {
  public static void main(String[] a) {
    JFrame window = new JFrame();
    window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    window.setBounds(30, 30, 450, 450);
    window.getContentPane().add(new MyCanvas());
    window.setVisible(true);
  }
}