game-of-prod/src/main/java/Block.java

import java.awt.*;
import java.util.Random;

public class Block extends Cell {
    Random random;
    Game game;

    public Block(Game game){
        super(-1, - 1, game.CELL_SIZE, Color.BLUE);
        this.game = game;
        this.random = new Random();
    }

    public boolean isInBlock(int x, int y) {
        if ((this.
                getX() == x) && (this.getY() == y))
            return true;
        return false;
    }

    public void appear() {                  // show food at new x,y coordinates
        int x, y;
        do {
            x = random.nextInt(20);
            y = random.nextInt(20);
        } while (game.isBusyCell(x, y));
        set(x, y);
    }
}