Как создать кнопку restart в игре змейке? How to create a restart button in the snake game?

Вот код: public class SnakeGame { public static void main(String[] args) { new GameFrame(); } } *---------------------------------------------------------------------------------------------------------* import javax.swing.*; public class GameFrame extends JFrame { GameFrame() { this.add(new GamePanel()); this.setTitle("Snake game by I. Radchuk"); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.setResizable(false); this.pack(); this.setVisible(true); this.setLocationRelativeTo(null); } } *--------------------------------------------------------------------------------------------------------* import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.xml.crypto.dom.DOMCryptoContext; import java.util.Random; public class GamePanel extends JPanel implements ActionListener { static final int SCREEN_WIDTH = 1300; static final int SCREEN_HEIGHT = 750; static final int UNIT_SIZE = 50; static final int GAME_UNITS = (SCREEN_WIDTH * SCREEN_HEIGHT) / (UNIT_SIZE * UNIT_SIZE); static final int DELAY = 175; final int x[] = new int[GAME_UNITS]; final int y[] = new int[GAME_UNITS]; int bodyParts = 6; int applesEaten; int appleX; int appleY; char direction = 'R'; boolean running = false; Timer timer; Random random; GamePanel() { random = new Random(); this.setPreferredSize(new Dimension(SCREEN_WIDTH, SCREEN_HEIGHT)); this.setBackground(Color.black); this.setFocusable(true); this.addKeyListener(new MyKeyAdapter()); startGame(); } public void startGame() { newApple(); running = true; timer = new Timer(DELAY, this); timer.start(); } public void paintComponent(Graphics g) { super.paintComponent(g); draw(g); } public void draw(Graphics g) { if (running) { /* for(int i=0;i<SCREEN_HEIGHT/UNIT_SIZE;i++) { g.drawLine(i*UNIT_SIZE, 0, i*UNIT_SIZE, SCREEN_HEIGHT); g.drawLine(0, i*UNIT_SIZE, SCREEN_WIDTH, i*UNIT_SIZE); } */ g.setColor(Color.red); g.fillOval(appleX, appleY, UNIT_SIZE, UNIT_SIZE); for (int i = 0; i < bodyParts; i++) { if (i == 0) { g.setColor(Color.green); g.fillRect(x[i], y[i], UNIT_SIZE, UNIT_SIZE); } else { g.setColor(new Color(45, 180, 0)); //g.setColor(new Color(random.nextInt(255),random.nextInt(255),random.nextInt(255))); g.fillRect(x[i], y[i], UNIT_SIZE, UNIT_SIZE); } } g.setColor(Color.red); g.setFont(new Font("Ink Free", Font.BOLD, 40)); FontMetrics metrics = getFontMetrics(g.getFont()); g.drawString("Score: " + applesEaten, (SCREEN_WIDTH - metrics.stringWidth("Score: " + applesEaten)) / 2, g.getFont().getSize()); } else { gameOver(g); } } public void newApple() { appleX = random.nextInt((int) (SCREEN_WIDTH / UNIT_SIZE)) * UNIT_SIZE; appleY = random.nextInt((int) (SCREEN_HEIGHT / UNIT_SIZE)) * UNIT_SIZE; } public void move() { for (int i = bodyParts; i > 0; i--) { x[i] = x[i - 1]; y[i] = y[i - 1]; } switch (direction) { case 'U': y[0] = y[0] - UNIT_SIZE; break; case 'D': y[0] = y[0] + UNIT_SIZE; break; case 'L': x[0] = x[0] - UNIT_SIZE; break; case 'R': x[0] = x[0] + UNIT_SIZE; break; } } public void checkApple() { if ((x[0] == appleX) && (y[0] == appleY)) { bodyParts++; applesEaten++; newApple(); } } public void checkCollisions() { for (int i = bodyParts; i > 0; i--) { if ((x[0] == x[i]) && (y[0] == y[i])) { running = false; } } if (x[0] < 0) { running = false; } if (x[0] > SCREEN_WIDTH) { running = false; } if (y[0] < 0) { running = false; } if (y[0] > SCREEN_HEIGHT) { running = false; } if (!running) { timer.stop(); } } public void gameOver(Graphics g) { g.setColor(Color.red); g.setFont(new Font("Ink Free", Font.BOLD, 40)); FontMetrics metrics1 = getFontMetrics(g.getFont()); g.drawString("Score: " + applesEaten, (SCREEN_WIDTH - metrics1.stringWidth("Score: " + applesEaten)) / 2, g.getFont().getSize()); g.setColor(Color.red); g.setFont(new Font("Ink Free", Font.BOLD, 75)); FontMetrics metrics2 = getFontMetrics(g.getFont()); g.drawString("Game Over", (SCREEN_WIDTH - metrics2.stringWidth("Game Over")) / 2, SCREEN_HEIGHT / 2); } @Override public void actionPerformed(ActionEvent e) { if(running) { move(); checkApple(); checkCollisions(); } repaint(); } public class MyKeyAdapter extends KeyAdapter{ @Override public void keyPressed(KeyEvent e) { switch(e.getKeyCode()) { case KeyEvent.VK_LEFT: if(direction != 'R') { direction = 'L'; } break; case KeyEvent.VK_RIGHT: if(direction != 'L') { direction = 'R'; } break; case KeyEvent.VK_UP: if(direction != 'D') { direction = 'U'; } break; case KeyEvent.VK_DOWN: if(direction != 'U') { direction = 'D'; } break; } } } } *--------------------------------------------------------------------------------------------------------*