convertOctalToBinary()

Step 1: Understanding the problem

The problem requires a function that converts an octal number to a binary number. In computers, octal (base 8) is a number system with digits ranging from 0 to 7. Binary (base 2), on the other hand, has only two digits, 0 and 1.

The first step is to convert the octal number to a decimal number (base 10) and then convert the decimal number to binary. We will do this process using in-built functions in Java.

int decimal = Integer.parseInt(octal, 8);

Step 2: Converting Decimal to Binary

After converting the octal value to a decimal, the next step is converting the decimal value to a binary. This process can also be done with an in-built function in Java.

String binary = Integer.toBinaryString(decimal);

Step 3: Creating the function

The next step is to create a function in which we will input our octal number, and it will output the equivalent binary number. The functions parseInt and toBinaryString will be included inside this function.

public static String convertOctalToBinary(String octal) {
    int decimal = Integer.parseInt(octal, 8);
    String binary = Integer.toBinaryString(decimal);
    return binary;
}

Step 4: Testing the function

The final step is to test the function. We will provide an octal number and call the function to convert it to binary.

public static void main(String[] args) {
    String octal = "10";
    String binary = convertOctalToBinary(octal);
    System.out.println(binary);
}

Conclusion

This function is able to convert an octal number into a binary number using Java's in-built functions for number system conversions. Here is the full code:

public class Main {
    public static void main(String[] args) {
        String octal = "10";
        String binary = convertOctalToBinary(octal);
        System.out.println(binary);
    }

    public static String convertOctalToBinary(String octal) {
        int decimal = Integer.parseInt(octal, 8);
        String binary = Integer.toBinaryString(decimal);
        return binary;
    }
}