question: public static String bytesToBinHex ( byte [ ] data , int nStartPos , int nNumOfBytes ) { StringBuilder sbuf = new StringBuilder ( ) ; sbuf . setLength ( nNumOfBytes << 1 ) ; int nPos = 0 ; for ( int nI = 0 ; nI < nNumOfBytes ; nI ++ ) { sbuf . setCharAt ( nPos ++ , HEXTAB [ ( data [ nI + nStartPos ] > > 4 ) & 0x0f ] ) ; sbuf . setCharAt ( nPos ++ , HEXTAB [ data [ nI + nStartPos ] & 0x0f ] ) ; } return sbuf . toString ( ) ; }
target:  converts a byte array to a binhex string