Java Stream How to - Calculate fibonacci

Question

We would like to know how to calculate fibonacci.
Answer

/*w w  w . j ava  2 s  . com*/
import java.util.function.BinaryOperator;
import java.util.function.Predicate;

public class Main {
    private static int fibonacci(int n) {
        if (n == 0)
            return 0;
        else if (n == 1)
            return 1;
        else
            return fibonacci(n - 1) + fibonacci(n - 2);
    }

    private static int fibonacciOperation(Predicate<Integer> condition,
            BinaryOperator<Integer> operation) {

        int i = 0;
        int result = 0;
        int fibo = fibonacci(i);
        for (int temp = operation.apply(result, fibo); condition.test(temp); fibo = fibonacci(i), temp = operation
                .apply(result, fibo)) {
            System.out.println(fibo + " ");
            result = temp;
            i++;
        }
        return result;
    }

    public static void main(String[] args) {
        int range = 100;
        System.out.println("Sum of even fibonacci number less then "
                + range
                + " is "
                + fibonacciOperation(i -> i < range,
                        (sum, i) -> i % 2 == 0 ? sum + i : sum));
        System.out.println("Sum of odd fibonacci number less then "
                + range
                + " is "
                + fibonacciOperation(i -> i < range,
                        (sum, i) -> i % 2 != 0 ? sum + i : sum));
    }
}
The code above generates the following result.