Conversion
  
 Source Code
  

    
// Contributed by - Anuj Das ( GC College, Silchar - @ Department of Computer Science )
import java.util.Scanner;

class BinToHex {
  int binaryToDecimal(long binary) {	
    int decimalNumber = 0, i = 0;
    while (binary > 0) {
      decimalNumber += Math.pow(2, i++) * (binary % 10);
      binary /= 10;
    }
    return decimalNumber;
  }
    
  String decimalToHex(long binary) {
    int decimalNumber = binaryToDecimal(binary);
    char arr[] = { 'A', 'B', 'C', 'D', 'E', 'F' };
    int remainder, i = 0;
  
    String hexNumber = "";
  
      while (decimalNumber != 0) {
      remainder = decimalNumber % 16;
        if(remainder >= 10)
          hexNumber = arr[remainder-10] + hexNumber;
        else
          hexNumber = remainder + hexNumber;
  
      decimalNumber /= 16;
      }
    return hexNumber;
  }
  
  
  public static void main(String[] args) {
      BinToHex ob = new BinToHex();
      System.out.print("Enter a Binary Number:  ");
      long bin = new Scanner(System.in).nextLong();
      System.out.println("Given Binary: " + bin);
      System.out.println("Hexadecimal : " + ob.decimalToHex(bin));
    }
  }
  
    

cmd->  javac  BinToHex.java
cmd->  java  BinToHex

Enter a Binary Number:  101011110011
Given Binary: 101011110011
Hexadecimal : AF3