Convert Binary to Hexadecimal()

Step 1: Understand The Problem

Firstly, you need to understand how binary and hexadecimal systems work. Binary is a base-2 system, and hexadecimal is a base-16 system. To convert a binary number to a hexadecimal, you have to group the binary number by 4 bits, starting from the least significant bit (LSB), because 2 to the power of 4 equals 16.

Step 2: Write A Function To Convert Binary To Hexadecimal

The first step is to define our function binaryToHex. This will accept a string of a binary number as an argument.

public static String binaryToHex(String binaryStr) {  
}

Step 3: Implementing The Conversion Logic

Use the Integer.parseInt method to parse the binary string into an integer. Java's Integer.toHexString method then converts this integer into a hexadecimal string, which the function returns.

public static String binaryToHex(String binaryStr) {  
    int decimal = Integer.parseInt(binaryStr, 2);
    return Integer.toHexString(decimal);
}

Step 4: Testing The Function

You should always test your code. Let's test our function with the binary string '1101' which is 'D' in hexadecimal.

public static void main(String[] args) {
    String binaryStr = "1101";
    System.out.println(binaryToHex(binaryStr)); // prints D
}

Step 5: Conclusion

To convert binary to hexadecimal in Java, first convert the binary number to a decimal number using Integer.parseInt(binaryStr, 2), and then convert the decimal number to a hexadecimal string using Integer.toHexString(decimal). The full write-up of the function is as follows:

public class Main {
 public static String binaryToHex(String binaryStr) {
        int decimal = Integer.parseInt(binaryStr, 2);
        return Integer.toHexString(decimal);
 }
 public static void main(String[] args) {
        String binaryStr = "1101";
        System.out.println(binaryToHex(binaryStr)); // prints D
 }
}