import java.math.BigInteger;
public class Main {
public static void main(String[] argv) throws Exception {
byte[] bytes = new byte[] { (byte) 0x12, (byte) 0x0F, (byte) 0xF0 };
BigInteger bi = new BigInteger(bytes);
// Format to hexadecimal
String s = bi.toString(16);
if (s.length() % 2 != 0) {
s = "0" + s;
}
}
}