①

public class Demo{
    public static void main(String[] args) {
        System.out.println(fibonacci(100));
    }

    public static int fibonacci(int n) {
        if (n == 1 || n == 2) {
            return 1;
        } else {
            return fibonacci(n - 1) + fibonacci(n - 2);
        }
    }
}
 

②

public class Demo{

    public static void main(String[] args) {
        for (int counter = 0; counter <= 30; counter++) {
            System.out.printf("Fibonacci of %d\t is: %d\n", counter, fibonacci(counter));
        }
    }

    public static long fibonacci(long number) {
        if ((number == 0
 
) || (number == 1))
            return number;
        else
            return fibonacci(number - 1) + fibonacci(number - 2);
    }

}