factorial using recursion in java

/**
 * @author lautturi.com
 * Java example: Java Factorial Program Using Recursion
 */

import java.util.*;

public class Lautturi {

	public static long factorial(long number) {
		if (number <= 1)
			return 1;
		else
			return number * factorial(number - 1);
	}

	public static void main(String[] args) {

		for (int counter = 0; counter <= 5; counter++) {
			System.out.printf("%d! = %d\n", counter, factorial(counter));
		}

	}
}

output:

0! = 1
1! = 1
2! = 2
3! = 6
4! = 24
5! = 120