Cyclic redundancy check ( CRC ) in java

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code in Java:

import java.io.*;

class CRC
{
 public static void main(String args[]) throws IOException
 {
  BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
  System.out.println("Enter Generator:");
  String gen = br.readLine();
  System.out.println("Enter Data:");
  String data = br.readLine();
  String code = data;
  while(code.length() < (data.length() + gen.length() - 1))
   code = code + "0";
  code = data + div(code,gen);
  System.out.println("The transmitted Code Word is: " + code);
  System.out.println("Please enter the received Code Word: ");
  String rec = br.readLine();
  if(Integer.parseInt(div(rec,gen)) == 0)
   System.out.println("The received code word contains no errors.");
  else
   System.out.println("The received code word contains errors.");
 }
 
 static String div(String num1,String num2)
 {
  int pointer = num2.length();
  String result = num1.substring(0, pointer);
  String remainder = "";
  for(int i = 0; i < num2.length(); i++)
  {
   if(result.charAt(i) == num2.charAt(i))
    remainder += "0";
   else
    remainder += "1";
  }
  while(pointer < num1.length())
  {
   if(remainder.charAt(0) == '0')
   {
    remainder = remainder.substring(1, remainder.length());
    remainder = remainder + String.valueOf(num1.charAt(pointer));
    pointer++;
   }
   result = remainder;
   remainder = "";
   for(int i = 0; i < num2.length(); i++)
   {
    if(result.charAt(i) == num2.charAt(i))
     remainder += "0";
    else
     remainder += "1";
   }
  }
  return remainder.substring(1,remainder.length());
 }
}

output:-

Enter Generator:
1011
Enter Data:
1001010
The transmitted Code Word is: 1001010111
Please enter the received Code Word: 
1110110111
The received code word contains errors.
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