8-Fibonacci sequence

Title: Everyone knows the Fibonacci sequence, and now requires an integer n, please output the nth item of the Fibonacci sequence (starting from 0, the 0th item is 0).

• code show as below

 1 public class Demo7 {
 2 
 3     public static void main(String[] args) {
 4         int fibonacci = Fibonacci(40);
 5         System.out.println(fibonacci);
 6     }
 7 
 8     public static int Fibonacci(int n) {
 9         if (n == 0)
10             return 0;
11         if (n == 1 || n == 2)
12             return 1;
13 
14         returnFibonacci (n - 1) + Fibonacci (n - 2 );
15      }
 16 }