Graphics.drawPolyline(int[] xPoints, int[] yPoints, int nPoints) has the following syntax.
public abstract void drawPolyline(int[] xPoints, int[] yPoints, int nPoints)
In the following code shows how to use Graphics.drawPolyline(int[] xPoints, int[] yPoints, int nPoints) method.
/* ww w.j av a 2 s . c o m*/ import java.awt.Graphics; import javax.swing.JFrame; import javax.swing.JPanel; public class Main extends JPanel { public void paint(Graphics g) { int[] xs = {25, 75, 125, 85, 125, 75, 25, 65}; int[] ys = {50, 90, 50, 100, 150, 110, 150, 100}; g.drawPolyline(xs, ys, 8); } public static void main(String[] args) { JFrame frame = new JFrame(); frame.add(new Main()); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setBounds(20,20, 500,500); frame.setVisible(true); } }