APL/DEV 3.2/TP05/Serpent/SnakePanel.java

import javax.swing.JPanel;
import java.awt.*;
import java.util.Random;
import java.util.Timer;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

public class SnakePanel extends JPanel {

    private Cell[][] grid;
    private ScheduledExecutorService gameRunner;
    private Snake snake;

    public final int sizeX = 25;
    public final int sizeY = 25;


    public SnakePanel() {
        super();
        grid = new Cell[sizeX][sizeY];

        setLayout(new GridLayout(sizeY, sizeX));

        for (int x = 0; x < sizeX; x++) {
            for (int y = 0; y < sizeY; y++) {
                grid[x][y] = new Cell();
                add(grid[x][y]);
            }
        }

        this.snake = new Snake(this);
        addKeyListener(new SnakeListener(this));

        gameRunner = Executors.newSingleThreadScheduledExecutor();
        gameRunner.scheduleAtFixedRate(new Runnable() {

            @Override
            public void run() {
                requestFocus();
                snake.performMove();
            }
            
        }, 0, 300, TimeUnit.MILLISECONDS);

        makeFruit();
    }

    public void makeFruit() {
        Random r = new Random();
        while (true) {
            int x, y;
            x = r.nextInt(sizeX);
            y = r.nextInt(sizeY);

            if (grid[x][y].getType() == CellType.EMPTY) {
                grid[x][y].setType(CellType.FRUIT);
                repaint();
                return;
            }
        }
    }

    public void gameOver() {
        gameRunner.shutdown();

        Timer gameOverTimer = new Timer();
        gameOverTimer.scheduleAtFixedRate(new GameOverTask(this, gameOverTimer), 0, 60);
    }

    public Cell[][] getGrid() {
        return grid;
    }

    public Snake getSnake() {
        return snake;
    }
}