Introduction

The below-given program lists the factorial of 1 to 20 and is a good example of Recursive Function in java:
Code
  1. public class RecursiveFunction {
  3. public static void main(String[] args) {
  4. System.out.println("Number\t\tFactorial");
  5. for (int i = 0; i <= 20; i++) {
  6. System.out.println(i + "\t\t" + Factorial(i));
  7. }
  8. }
  10. public static long Factorial(long x) {
  11. if (x == 0) {
  12. return 1;
  13. } else {
  14. return Factorial(x - 1) * x;
  15. }
  16. }
  17. }
Output
Number Factorial
0 1
1 1
2 2
3 6
4 24
5 120
6 720
7 5040
8 40320
9 362880
10 3628800
11 39916800
12 479001600
13 6227020800
14 87178291200
15 1307674368000
16 20922789888000
17 355687428096000
18 6402373705728000
19 21645100408832000
20 2432902008176640000