Java binary to hex - Java Program for Binary to Hexadecimal

Java binary to hex: In the previous article, we have discussed Java Program for Binary to Octal

In this article we will see how to convert Binary to Hexadecimal.

Java Program to Convert Binary to Hexadecimal

So, before going into the program directly, let’s know about binary and hexadecimal.

Binary:

Binary to hexadecimal java: Binary number mainly consists of only two numbers i.e. 0 and 1. The base address of the binary number is 2. For low voltage signal the value will 0 and for the high voltage signal the value will 1.

Example: (1001)2, (111000)2

Hexadecimal:

Hexadecimal number basically defines the base of 16 in the number system. This number is basically consists of 16(sixteen) single digits and alphabets like 0,1,2,3,4,5,6,7,8,9,A,B,C,D,E and F. This number is represented by 4(four) bit only.

Example: (214)16, (178)16

Let’s see different ways to do it.

By using toHexString() method
By repeatedly getting the remainder

Method-1: Java Program for Binary to Hexadecimal By using toHexString() method

In this approach the default method toHexString() is used.

import java.util.*;
public class BinaryToHex 
{

    //binary to decimal convesion
    int binaryToDecimal(long binary_no)
    {
        // for storing the variable conversion
        int decimal_Number = 0, i = 0;
        // loop to extract the digits of the binary
        while (binary_no > 0) 
        {
            //for extraction of the digits
            decimal_Number
            += Math.pow(2, i++) * (binary_no % 10);
            // updating the binary by eliminating
            // the last digit on division by 10
            binary_no /= 10;
        }
        // returning the decimal number
        return decimal_Number;
    }
        
    // method to convert decimal to hexadecimal
    String decimalToHex(long binary_no)
        {
        // variable to store the output of the
        // binaryToDecimal() method
        int decimal_Number = binaryToDecimal(binary_no);
        
        // converting the integer to the desired
        // hex string using toHexString() method
        String hexNumber= Integer.toHexString(decimal_Number);
        hexNumber = hexNumber.toUpperCase();
    
        return hexNumber;
    }
    
    public static void main(String[] args)
    {
    
        // instantiating the class
        BinaryToHex ob = new BinaryToHex();
        
        Scanner sc = new Scanner(System.in);
        
        System.out.println("Enter the binary number : ");
        long n = sc.nextLong();
        System.out.println("After converting the "+n+" is : "+ob.decimalToHex(n));
    
    }
}

Output:
Enter the binary number :
after converting the 1011111 is:
5F

Method-2: Java Program for Binary to Hexadecimal By repeatedly getting the remainder

In this approach first we will convert the binary number to decimal number. After that continuously dividing and getting the remainder for getting single character for four bit type for the original binary number.

import java.util.*;

public class BinaryToHex
{
    
    // conversion of binary to decimal
    int binaryToDecimal(long binary_no)
    {
    
        // variable declaration
        int decimal_Number = 0, k = 0;
        
        while (binary_no > 0)
        {
        
        // extraction of each digit of the binary
        decimal_Number+= Math.pow(2, k++) * (binary_no % 10);
        binary_no /= 10;
        }
    
    // for returning the decimal value
    return decimal_Number;
    }
    
    // method to convert decimal to hex
    String decimalToHex(long binary_no)
    {
    
        // for storing the variable output
        // binaryToDecimal() method
        int decimal_Number = binaryToDecimal(binary_no);
        
        // character array to represent double
        // digit remainders
        char arr[] = { 'A', 'B', 'C', 'D', 'E', 'F' };
        
        // variable to store the remainder on
        // division by 16
        int remainder, i = 0;
        
        // declaring the string that stores the
        // final hex string
        String hex_Number = "";
        
        // loop to convert decimal to hex
        while (decimal_Number != 0) 
        {
            // calculating the remainder of decimal
            // by dividing by 16
            remainder = decimal_Number % 16;
            // checking if the remainder is >= 10
            if (remainder >= 10)
            // replacing with the corresponding
            // alphabet from the array
            hex_Number = arr[remainder - 10] + hex_Number;
            else
            hex_Number = remainder + hex_Number;
            decimal_Number /= 16;
        }
        
        // returning the hex string
        return hex_Number;
    }
    
    // Driver Code
    public static void main(String[] args)
    {
        
        // for instantiating the class
        BinaryToHex ob = new BinaryToHex();
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter the binary number : ");
        long n = sc.nextLong();
        System.out.println("after converting the "+n+" is  : "+ob.decimalToHex(n));
    
    }
}

Output:

Enter the binary number :
after converting the 101111111 is:
17F

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