Can you add comments to each line of this program? import java

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Can you add comments to each line of this program?

import java.util.Scanner;

import java.math.BigInteger;

public class MyClass {

 public static BigInteger factorial(int number) {

 if (number <= 1)

  return BigInteger.ONE;

 else

  return factorial(number - 1).multiply(BigInteger.valueOf(number));

 }

 public static void main(String args[]) {

 Scanner in = new Scanner(System.in);

 BigInteger number = in .nextBigInteger();

 System.out.println("Factorial of " + number + " is: " + (factorial(number.intValue())));

 }

}