DecimalToBinary()

Step 1: Understand the Problem

The problem requires converting a decimal number into a binary number. In Java, this can be achieved by repeatedly dividing the decimal number by 2 and storing the remainder till we get to 0.

int num = 42;  // decimal number

Step 2: Declare Binary String

We declare a string that will hold the binary value of the decimal number.

String binary = "";  // binary string

Step 3: Conversion Process

Like mentioned earlier, the conversion process involves continuously dividing num by 2 and storing the remainder until we get to zero.

while (num > 0) {
    binary = (num % 2) + binary;
    num /= 2;
}

Step 4: Printing the Binary String

Finally we print out the binary string which now holds the binary value of the decimal number.

System.out.println(binary);

Conclusion

We've now accomplished the task of converting a decimal number to binary in Java. Here is the full code:

public class Main {
    public static void main(String[] args) {
        int num = 42;  // decimal number
        String binary = "";  // binary string
        while (num > 0) {
            binary = (num % 2) + binary;
            num /= 2;
        }
        System.out.println(binary);
    }
}

This code will output 101010 which is the binary equivalent of the decimal number 42.