Paint a calendar in Java

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
/* w ww  .  j  a v  a 2  s . c om*/
import javax.swing.JComponent;
import javax.swing.JFrame;

class MyCanvas extends JComponent {
  public void paint(Graphics g) {
    SimpleDateFormat month = new SimpleDateFormat("MMMM");
    SimpleDateFormat year = new SimpleDateFormat("yyyy");
    SimpleDateFormat day = new SimpleDateFormat("d");
    Date date = new Date();
    ((Graphics2D) g).setRenderingHint(RenderingHints.KEY_ANTIALIASING,
        RenderingHints.VALUE_ANTIALIAS_ON);
    g.fillRect(0, 0, getWidth(), getHeight());
    g.setColor(Color.black);
    g.drawString(month.format(date), 34, 36);
    g.setColor(Color.white);
    g.drawString(year.format(date), 235, 36);

    Calendar today = Calendar.getInstance();
    today.setTime(date);
    Calendar cal = Calendar.getInstance();
    cal.setTime(date);
    cal.set(Calendar.DATE, 1);
    cal.add(Calendar.DATE, -cal.get(Calendar.DAY_OF_WEEK) + 1);
    for (int week = 0; week < 6; week++) {
      for (int d = 0; d < 7; d++) {
        g.drawString(day.format(cal.getTime()), d * 30 + 46 + 4,
            week * 29 + 81 + 20);
        cal.add(Calendar.DATE, +1);
      }
    }
  }
}

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);
  }
}