//Making hex extension
class HexByte{
	public static void main(String[] args){
		char Hex[] = {
			'0','1','2','3','4','5','6','7',
			'8','9','a','b','c','d','e','f'
		};
		byte b = (byte) 0xF1;

		System.out.println("b = 0x" + Hex[(b >> 4) & 0x0F] + Hex[b & 0x0F]);
	}
}