papka pishet CodersRank

import java.io.*;
import java.math.BigDecimal;
import java.util.*;

public class Main {

    public static void main(String[] args) throws IOException {
        double percentile = 0.00;
        double median;
        double maxValue;
        double minValue;
        double avrgValue;
        if (args.length < 1) {
            System.out.println("Ошибка: отсуствует файл с входными данными");
        }
        File file = new File(args[0]);
        List<Double> data = initDataList(file);
        median = findMedian(data);
        maxValue = findMax(data);
        minValue = findMin(data);
    }


    private static List<Double> initDataList(File file) throws FileNotFoundException {
        Scanner reader = new Scanner(file);
        List<Double> dataList = new ArrayList<Double>();
        while (reader.hasNextLine()) {
            dataList.add(Double.parseDouble(String.valueOf(reader.nextInt())));
        }
        return dataList;
    }

    private static double findMax(List<Double> data) {
        double max = Double.MIN_VALUE;
        for (double item : data
        ) {
            if (item > max) {
                max = item;
            }
        }
        return max;
    }

    private static double findMin(List<Double> data) {
        double min = Double.MAX_VALUE;
        for (double item : data
        ) {
            if (item < min) {
                min = item;
            }
        }
        return min;
    }

    private static double findAvrg(List<Double> data) {
        double sum = 0;
        int count = 0;
        for (double item :
                data) {
            count++;
            sum += item;
        }
        return sum / count;
    }

    static double findMedian(List<Double> data) {
        Collections.sort(data);
        double median;
        int totalElements = data.size();
        if (totalElements % 2 == 0) {
            double sumOfMiddleElements = data.get(totalElements / 2) + data.get(totalElements / 2 - 1);
            median = sumOfMiddleElements / 2;
        } else {
            median = data.get(totalElements / 2);
        }
        return median;
    }

    static double findPercentile(List<Double> data) {
        double percentile = 0;
        // TODO percentile
        return percentile;
    }
}