Example: Decimal to Binary Converter in Java

// Decimal to Binary Converter
import java.util.Scanner;

// Main class containing the entry point of the program
public class Main {

    // Method to convert a decimal number to its binary representation
    public static String convertDecimalToBinary(int decimalNumber) {
        // Handle the special case for 0
        if (decimalNumber == 0) {
            return "0";
        }

        StringBuilder binaryBuilder = new StringBuilder();

        // Repeatedly divide the decimal number by 2
        // and append the remainder to the StringBuilder
        while (decimalNumber > 0) {
            int remainder = decimalNumber % 2; // Get the remainder
            binaryBuilder.append(remainder);   // Append remainder
            decimalNumber = decimalNumber / 2; // Update decimal number
        }

        // The binary string is built in reverse, so reverse it before returning
        return binaryBuilder.reverse().toString();
    }

    public static void main(String[] args) {
        // Step 1: Create a Scanner object to read user input
        Scanner scanner = new Scanner(System.in);

        // Step 2: Prompt the user to enter a decimal number
        System.out.print("Enter a decimal number: ");

        // Step 3: Read the integer input from the user
        int decimal = scanner.nextInt();

        // Step 4: Call the conversion method
        String binaryResult = convertDecimalToBinary(decimal);

        // Step 5: Print the binary equivalent
        System.out.println("The binary equivalent is: " + binaryResult);

        // Step 6: Close the scanner
        scanner.close();
    }
}