import java.awt.BorderLayout;
import java.awt.Canvas;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.image.BufferStrategy;

import javax.swing.JFrame;

public class Game extends Canvas implements Runnable {
    private static final long serialVersionUID = 1L;

    private boolean running;

    public static int WIDTH = 400;
    public static int HEIGHT = 300;
    public static String NAME = "TUTORIAL 1";

    public void start() {
        running = true;
        new Thread(this).start();
    }

    public void run() {
        long lastTime = System.currentTimeMillis();
        long delta;

        init();

        while(running) {
            delta = System.currentTimeMillis() - lastTime;
            lastTime = System.currentTimeMillis();
            render();
            update(delta);
        }
    }

    public void init() {

    }

    public void render() {
        BufferStrategy bs = getBufferStrategy();
        if (bs == null) {
            createBufferStrategy(2);
            requestFocus();
            return;
        }

        Graphics g = bs.getDrawGraphics(); //получаем Graphics из созданной нами BufferStrategy
        g.setColor(Color.black); //выбрать цвет
        g.fillRect(0, 0, getWidth(), getHeight()); //заполнить прямоугольник
        g.dispose();
        bs.show(); //показать
    }

    public void update(long delta) {

    }

    public static void main(String[] args) {
        Game game = new Game();
        game.setPreferredSize(new Dimension(WIDTH, HEIGHT));
        JFrame frame = new JFrame(Game.NAME);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLayout(new BorderLayout());
        frame.add(game, BorderLayout.CENTER);
        frame.pack();
        frame.setResizable(false);
        frame.setVisible(true);
        game.start();
    }
}