Java程序计算五个双精度浮点数中间值

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        RR rr = new RR();
        double dd = rr.fun();
        System.out.printf('%.2f', dd);
    }
}

class RR {
    public static double fun() {
        Scanner scanner = new Scanner(System.in);
        double a = scanner.nextDouble();
        double b = scanner.nextDouble();
        double c = scanner.nextDouble();
        double d = scanner.nextDouble();
        double e = scanner.nextDouble();
        double[] array = {a, b, c, d, e};
        return array[(array.length) / 2];
    }
}