Java 2D and Polylines- General Path

Question

Hello everyone,
with a friend we have to prepare a project for the university. There are a lot to be done however the most important to be done first is drawing a General Path, providing two arrays. One of x coordinates and one of y coordinates. So I tried Java 2D but I am afraid a have some problems understanding how java2D works. To start, I need to create an application which draws a polyline (open). However mosr examples I've been through are only referring to applets, but I need an application instead. I have a problem moving from the examples in applets to an application. I want to give me some tips on how to create the application. If haven't gotten accross I'll be glad to provide some more detailed info.
Thanks in advance.

Answer 1

import java.awt.*;
import java.awt.geom.GeneralPath;
import javax.swing.*;
public class ExampleApp
    public ExampleApp()
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(new PathPanel());
        f.setSize(400,400);
        f.setLocation(200,200);
        f.setVisible(true);
    public static void main(String[] args)
        new ExampleApp();
class PathPanel extends JPanel
    GeneralPath path;
    public PathPanel()
        initPath();
    protected void paintComponent(Graphics g)
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D)g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                            RenderingHints.VALUE_ANTIALIAS_ON);
        g2.draw(path);
    private void initPath()
        int[] x = { 40, 140, 200, 260, 360 };
        int[] y = { 40, 340, 80,  340, 40  };
        path = new GeneralPath();
        path.moveTo(x[0], y[0]);
        for(int j = 1; j < x.length; j++)
            path.lineTo(x[j], y[j]);
}