Finding Factorial in Java

public class Find_Factorial {
    public static void main(String[] args) {
        int inputNum = 5; //The int you would like to find the factorial of.
        int i = 1; //i will be used as a counter in our while loop and will be 1 because any number multiplied by 0 is 0
        int sum = 1; //sum will be the sum
//Since the factorial of a number is the product of all the lesser numbers incdluding the number itself
//We will set a loop that takes the value of i and multiply it by sum until i reaches inputNum
        while (i <= inputNum){ //while i is less than or equal to inputNum
            sum = sum * 1;
            //this will be sum * 1; sum * 2; sum * 3; etc.. until i equals inputNum
            i = i + 1; //this will increment i by one everytime the loop finishes
        }
        System.out.println("The factorial of " + inputNum + " is: " + sum);
        //prints out the factorial of inputNum
    }

}