FlappyBird - GamePanel

import javax.swing.*;
import java.awt.*;

public class GamePanel extends JPanel implements Runnable {

    private final Thread thread = new Thread(this);

    private final Player player;

    public GamePanel(Player player) {
        this.player = player;
        thread.start();
        setBackground(Color.BLACK);
        addKeyListener(player);
        setFocusable(true);
    }

    @Override
    public void run() {
        while (thread != null) {

            update();
            try {
                Thread.sleep(16);
            } catch (InterruptedException e) {
                throw new RuntimeException(e);
            }
            repaint();
        }
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D) g;
        player.drawPlayer(g2);
    }

    private void update() {
        player.update();
    }
}