OnJava8-Examples/functional/RecursiveFibonacci.java

// functional/RecursiveFibonacci.java
// (c)2020 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.

public class RecursiveFibonacci {
  IntCall fib;
  RecursiveFibonacci() {
    fib = n -> n == 0 ? 0 :
               n == 1 ? 1 :
               fib.call(n - 1) + fib.call(n - 2);
  }
  int fibonacci(int n) { return fib.call(n); }
  public static void main(String[] args) {
    RecursiveFibonacci rf = new RecursiveFibonacci();
    for(int i = 0; i <= 10; i++)
      System.out.println(rf.fibonacci(i));
  }
}
/* Output:
0
1
1
2
3
5
8
13
21
34
55
*/