static Dimension map = new Dimension(42, 30);
    static Dimension tile = new Dimension(16, 16);
    static File tilefile = new File("D:/tileset.png");
    static BufferedImage tileset;
    static BufferedImage[] tiles;
    
    static {
	if (tiles == null) {
            try {
                tileset = ImageIO.read(tilefile);
                tiles = new BufferedImage[7952];
                int x = 0, y = 0;
		int w = tileset.getWidth() / tile.width;
		int h = tileset.getHeight() / tile.height;
                for (int i = 0; i < tiles.length; i++) {
		    tiles[i] = new BufferedImage(tile.width, tile.height, BufferedImage.TYPE_INT_RGB);
		    Graphics g = tiles[i].getGraphics();
		    int dx = 0, dy = 0, dx2 = tile.width, dy2 = tile.height;
		    int sx = x * tile.width, sy = y * tile.width, sx2 = sx + dx2, sy2 = sy + dy2;
		    g.drawImage(tileset, dx, dy, dx2, dy2, sx, sy, sx2, sy2, null);
		    x++;
		    if (x > w) {
                        x = 0;
			y++;
                    }
		    ImageIO.write(tiles[i], "png", new File("D:/tiles/" + i + ".png"));
                }
            } catch (IOException ex) {
		ex.printStackTrace();
            }
	}
    }