Create dashed stroke in Java

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
//from ww w  . ja  v a  2 s  . c om
import javax.swing.JComponent;
import javax.swing.JFrame;

class MyCanvas extends JComponent {
  public void paint(Graphics g) {
    Graphics2D g2 = (Graphics2D) g;
    float dash[] = { 10.0f };
    g2.setStroke(new BasicStroke(3.0f, BasicStroke.CAP_BUTT,
        BasicStroke.JOIN_MITER, 10.0f, dash, 0.0f));

    g2.setPaint(Color.blue);
    
    Rectangle r = new Rectangle(5,5,200,200);
    
    g2.draw(r);

  }
}

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);
  }
}