被坑了一天, Java类型的问题

gistfile1.txt

// data is byte[]
// tmp  is OutputStream
for (int i = 0; i < data.length; i++) {
	int b = data[i];
	switch (b) {
	case 0x55:
	case 0xAA:
	case 0xBB:
		log.info("Found sp=" + Integer.toHexString(b));
		tmp.write(0xBB);
		tmp.write(data[i] + 1);
		break;
	default :
		tmp.write(data[i]);
		break;
	}
}