How to convert GridImageItem to JPEGImageItem with java

[javading]

My main code is as follows：

`

HEIF heif = new HEIF();
heif.load("/root/1.heic");
ImageItem primaryImage = heif.getPrimaryImage();
List<byte[]> imageSequenceSampleDatas = new ArrayList<>();

if (primaryImage instanceof GridImageItem) {
    GridImageItem gridImageItem = (GridImageItem) primaryImage;
    // Go through the grid
    for (int rowIndex = 0; rowIndex < gridImageItem.getRowCount(); rowIndex++) {
        for (int columnIndex = 0; columnIndex < gridImageItem.getColumnCount(); columnIndex++) {
            // We assume that the image items are HEVC
            HEVCImageItem hevcImageItem = (HEVCImageItem) gridImageItem.getImage(columnIndex, rowIndex);
         //   byte[] decoderConfig = hevcImageItem.getDecoderConfig().getConfig();
            byte[] imageData1 = hevcImageItem.getItemDataAsArray();

            JPEGDecoderConfig decoderConfig = new JPEGDecoderConfig(newHeif, decoderConfigData);
            JPEGImageItem jpegImageItem = new JPEGImageItem(newHeif, new Size(width, height), decoderConfig, imageData1);

            newHeif.setPrimaryImage(jpegImageItem);
            newHeif.setMajorBrand(HEIF.BRAND_JPEG);
            newHeif.addCompatibleBrand(HEIF.BRAND_JPEG);

            newHeif.save("/root/1-1.jpg");
        }
    }
}`