import java.awt.BasicStroke;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.geom.GeneralPath;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class MainClass extends JPanel {
public void paint(Graphics g) {
Graphics2D g2 = (Graphics2D) g;
RenderingHints rh = g2.getRenderingHints();
rh.put(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2.setRenderingHints(rh);
BasicStroke bs = new BasicStroke(36.0f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL);
g2.setStroke(bs);
GeneralPath path = new GeneralPath();
path.moveTo(30.0f, 90.0f);
path.lineTo(150.0f, 20.0f);
path.lineTo(270.0f, 90.0f);
g2.draw(path);
}
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);
}
}