package com.company;

import sun.rmi.server.InactiveGroupException;

import java.awt.*;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class Main {

    static class AvgCalculator {

        public double calculateAvg(List<Integer> grades) {
            List<Integer> copy = new ArrayList<>(grades);
            if(grades.size() > 3) {
                final Integer max = Collections.max(copy);
                final Integer min = Collections.min(copy);

                copy.remove(max);
                copy.remove(min);
            }

            return internalCalculateAvg(copy);
        }

        private double internalCalculateAvg(List<Integer> grades) {
            double sum = 0;
            for (Integer grade : grades) {
                sum += grade;
            }
            return sum / grades.size();
        }

    }

    public static void main(String[] args) {
        List<Integer> grades = new ArrayList<>();
        grades.add(1);
        grades.add(2);
        grades.add(3);
        grades.add(4);
        grades.add(6);

        AvgCalculator avgCalculator = new AvgCalculator();

        System.out.println("List before method: " + grades);
        final double result = avgCalculator.calculateAvg(grades);
        System.out.println("List after method: " + grades);
        System.out.println("result: " + result);


    }
}