public void render(){

        for(int y = 0; y < map.length; y++){
            for(int x = 0; x < map[0].length; x++){
                int tile = map[x][y];

                if(tile == Tile.GRASS)
                    screen.render(Tiles.GRASS, x * tileWidth, y * tileHeight);
                else if(tile == Tile.WALL)
                    screen.render(Tiles.WALL, x * tileWidth, y * tileHeight);


            }
        }

        screen.render(Tiles.HERO, hero.x / tileWidth, hero.y / tileHeight);
    }