Java implementation string Conversion hex MD5 Value

public class Encode {
Public final static String MD5 (string s) {
Char hexdigits[] = {' 0 ', ' 1 ', ' 2 ', ' 3 ', ' 4 ', ' 5 ', ' 6 ', ' 7 ', ' 8 ', ' 9 ',
' A ', ' B ', ' C ', ' D ', ' E ', ' F '};
try {
byte[] Btinput = S.getbytes ();
MessageDigest object for obtaining the MD5 digest algorithm
MessageDigest mdinst = messagedigest.getinstance ("MD5");
Updates the digest with the specified bytes
Mdinst.update (Btinput);
Get ciphertext
byte[] MD = Mdinst.digest ();
Convert ciphertext to 16-binary string form

int j = Md.length;
Char str[] = new CHAR[J * 2];
int k = 0;
for (int i = 0; i < J; i++) {
byte byte0 = md[i];
str[k++] = hexdigits[byte0 >>> 4 & 0xf];
str[k++] = hexdigits[byte0 & 0xf];
}
return new String (str);
} catch (Exception e) {
E.printstacktrace ();
return null;
}
}
}

Java implementation string Conversion hex MD5 Value