import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Line2D;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class MainClass extends JPanel {
public void paint(Graphics g) {
Graphics2D g2 = (Graphics2D) g;
int w = getSize().width - 1;
int h = getSize().height - 1;
for (int i = 0; i < 12; i++) {
double angle = Math.PI / 2 - i * Math.PI / 6;
double x = Math.cos(angle);
double y = Math.sin(angle);
Line2D l = new Line2D.Double(100 + 55.0 * x, 100 - 55.0 * y, 100 + 65.0 * x, 100 - 65.0 * y);
g2.draw(l);
}
}
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.getContentPane().add(new MainClass());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(200, 200);
frame.setVisible(true);
}
}