Below code illustrates about finding a factorial of given number using recursion in Java:

public class FactorialUsingRecursion {
 
	public static void main(String[] args) {
		int x = 4;
		int result = 0;
		result = factorial(x);
		System.out.println(result);
	}
	
	private static int factorial(int x) {
		if(x > 1) {
			return (x * factorial(x-1));
		}
		return 1;
	}
}