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");
		}
	}
}`