Fibonacci Series Program

public class FibonacciCalculator {

    public static void main(String[] args) {
        int number = 12;
        System.out.println("Fibonacci series upto " + number + " numbers : "); //printing Fibonacci series upto number
        for (int i = 1; i <= number; i++) {
            System.out.print(fibonacci2(i) + " ");
        }
    }

    public static int fibonacci2(int number) {
        if (number == 1 || number == 2) {
            return 1;
        }
        int fibo1 = 1, fibo2 = 1, fibonacci = 1;
        for (int i = 3; i <= number; i++) { //Fibonacci number is sum of previous two Fibonacci number
            fibonacci = fibo1 + fibo2;
            fibo1 = fibo2;
            fibo2 = fibonacci;
        }
        return fibonacci;
    }

    public static int fibonacci(int number) {
        if (number == 1 || number == 2) {
            return 1;
        }
        return fibonacci(number - 1) + fibonacci(number - 2); //tail recursion
    }
    
    public static int getFibonacci(int n) {
        if (n == 0) {
            return 0;
        }
        if (n == 1) {
            return 1;
        }
        int first = 0;
        int second = 1;
        int nth = 1;
        for (int i = 2; i <= n; i++) {
            nth = first + second;
            first = second;
            second = nth;
        }
        return nth;
    }
}