Java Cumulative and checksum implementation mode 16 (recommended) _java

A string is known, and the 16 sum of the string is given, and a string and a checksum code are known, and the checksum additive is valid, but not much. directly on the code

public static string Makechecksum (String data) {
 if (data = null | | data.equals ("")) {return
  "";
 }
 int total = 0;
 int len = Data.length ();
 int num = 0;
 while (Num < len) {
  String s = data.substring (num, num + 2);
  System.out.println (s);
  Total + = Integer.parseint (s,);
  num = num + 2;
 }
 /**
  * With 256 of the maximum is 255, that is, 16-in
  FF
 /int mod = total% 256;
 String hex = integer.tohexstring (mod);
 Len = Hex.length ();
 If the length of the check bit is not enough, fill 0, here is the two-digit checksum
 if (Len < 2) {
  hex = "0" + hex;
 }
 return hex;
 }

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