Use dashed stroke to draw dashed line in Java

//from  w w  w .jav a2 s . c o  m
import java.awt.BasicStroke;
import java.awt.Graphics;
import java.awt.Graphics2D;

import javax.swing.JComponent;
import javax.swing.JFrame;

class MyCanvas extends JComponent {
  public void paint(Graphics g) {

    Graphics2D g2d = (Graphics2D) g;

    float[] dash1 = { 2f, 0f, 2f };

    g2d.drawLine(20, 40, 250, 40);

    BasicStroke bs1 = new BasicStroke(1, 
        BasicStroke.CAP_BUTT, 
        BasicStroke.JOIN_ROUND, 
        1.0f, 
        dash1,
        2f);
    g2d.setStroke(bs1);
    g2d.drawLine(20, 80, 250, 80);

  }
}

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);
  }
}