Java tutorial
import java.io.ByteArrayOutputStream; import java.io.DataOutputStream; import java.io.IOException; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; public class MainClass { public static byte[] makeBytes(long t, double q) { try { ByteArrayOutputStream byteOut = new ByteArrayOutputStream(); DataOutputStream dataOut = new DataOutputStream(byteOut); dataOut.writeLong(t); dataOut.writeDouble(q); return byteOut.toByteArray(); } catch (IOException e) { return new byte[0]; } } }