Swing graphics reposition drawString

Question

I am drawing a string on the users screen, and I want to move that string around, but it doesn't change position, This is my code

public static int x = 200, y = 200;

    public static Window draw() {
    Window w = new Window(null) {
        @Override
        public void paint(Graphics g) {
            super.paint(g);
            System.out.println("repainting");
            final Font font = getFont().deriveFont(48f);
            g.setFont(font);
            g.setColor(Color.WHITE);
            final String message = "Hello";
            FontMetrics metrics = g.getFontMetrics();
            g.drawString(message, x, y);
        }

        @Override
        public void update(Graphics g) {
            paint(g);
        }
    };
    w.setAlwaysOnTop(true);
    w.setBounds(w.getGraphicsConfiguration().getBounds());
    w.setBackground(new Color(0, true));
    w.setVisible(true);
    return w;
}


  public static void main(String[] args) throws AWTException {
        Window window = draw();
        x = 500;
        y = 500;
        window.repaint();
        window.invalidate();
        }
    }

It doesn't seem to change the text position, It prints out repainting so the point method is getting called, and I have printed x, y inside the paint method and it seems to be updated aswell, so there is something wrong with graphics that doesn't want to draw a new string.

Answer 1

Just delete your Window class altogether and replace it with a JFrame. Then the custom class should be a JPanel and just override the paintComponent. I am guessing it doesn't work so you're going through things to make it work and you've ended up with some pretty dodgy code.

import javax.swing.JFrame;
import javax.swing.JPanel;
import java.awt.Graphics;
import javax.swing.Timer;
import java.awt.EventQueue;

public class Confusion{
    static int x = 100;
    static int y = 0;
    static double theta = 0;

    public static void startGui(){
        JFrame frame = new JFrame("title");

        JPanel panel = new JPanel(){
            public void paintComponent(Graphics g){
                g.drawString("string", x, y);
            }
        };
        frame.setSize(640, 480);
        frame.add(panel);
        frame.setVisible(true);
        Timer timer = new Timer( 30, (e)->{
            x = (int)(300 + Math.sin(theta)*200);
            y = (int)(300 - Math.cos(theta)*200);
            theta += 0.1;
            panel.repaint();        
        } );
        timer.start();
    }
    public static void main(String[] args) throws Exception {
        EventQueue.invokeAndWait( Confusion::startGui );   
    }
}