Java graphics and animation

Draw.java

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class Draw extends JPanel {
    static int x = 0;
    static int delay = 10;
    static int speed = 5;
    public static void main(String[] args) {
        JFrame frame = new JFrame("Project");
        frame.setSize(600, 400);
        frame.add(new Draw());
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        ActionListener taskPerformer = new ActionListener() {
            public void actionPerformed(ActionEvent evt) {
                x += speed;
                if (x > 600) {
                    x = - 100;
                }
                frame.repaint();
            }
        };
        new Timer(delay, taskPerformer).start();
    }

    public void paint (Graphics g) {
        g.setColor(Color.BLACK);
        g.fillRect(0, 0, 600, 400);
        g.setColor(Color.ORANGE);
        g.fillOval(x, 100, 100, 100);
    }

    public void go() {

    }
}