图像不会显示

Question

当bigImg成为它确实显示的图像时，但当sprites[dir]成为图像时它不会显示。 在跑步时，我画了一个小盒子来显示精灵的位置，里面什么都没有。

 public void getSprite(){
    BufferedImage bigImg = null;
    try {
        bigImg = ImageIO.read(new File("Pacman.png"));
    } catch (IOException e) {
        System.out.println("hey");
        e.printStackTrace();
    }
    // The above line throws an checked IOException which must be caught.

    final int width = 7;
    final int height = 7;
    final int rows = 4;
    final int cols = 3;
    BufferedImage[] sprites = new BufferedImage[rows * cols];
    System.out.println(bigImg.getHeight() + "," + bigImg.getWidth());
    for (int i = 0; i < rows; i++)
    {
        for (int j = 0; j < cols; j++)
        {
            sprites[(i * cols) + j] = bigImg.getSubimage(
                j * width,
                i * height,
                width,
                height
            );
        }
    } 
    //image = bigImg;
}

 public void setSprite (int direction){
    System.out.println("HEY");
    System.out.println(sprites[1].getHeight());
    image = sprites[direction];
}