public String toHexString(){
  final StringBuilder buf=new StringBuilder(24);
  for (  final byte b : toByteArray()) {
    buf.append(String.format("%02x",b & 0xff));
  }
  return buf.toString();
}

public String toHexString ( ) { final StringBuilder buf = new StringBuilder ( 24 ) ; for ( final byte b : toByteArray ( ) ) { buf . append ( String . format ( "%02x" , b & 0xff ) ) ; } return buf . toString ( ) ; }
converts this instance into a 24 - byte hexadecimal string representation .
