Factorial.java

import java.util.Scanner;

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 // Java Program to find Factorial of a number using Recursion
public class Factorial {

    public static void main(String args[]) {

        // create Scanner class object to get input from user
        Scanner scanner = new Scanner(System.in);
		
        System.out.println("Enter a number:");
		
        //get user's enetered value from 'scanner' object into 'num' variable
        int num = scanner.nextInt();
		
        // called the function 'fact(int)'
        int factorial = fact(num);
		
        System.out.println("Factorial of "+num+" is = " + factorial);

    }
	
	// created static function fact(int)
    static int fact(int num) {
        
		int output;
        if (num == 1) {
            return 1;
        }
		
        // Recursion: Function calling itself!!
        output = fact(num - 1) * num;
        return output;
    }

}