01. Count Real Numbers

package mapAndStreamAPI;

import java.util.*;
import java.util.stream.Collectors;

public class P01CountRealNumbers {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        List<Double> numbersList = Arrays
                .stream(scanner.nextLine().split(" "))
                .map(Double::parseDouble)
                .collect(Collectors.toList());

        Map<Double, Integer> countsNumbersMap = new TreeMap<>();

        //8 2 2 8 2
        for (int i = 0; i < numbersList.size(); i++) {
            double currentNum = numbersList.get(i);

            if (countsNumbersMap.containsKey(currentNum)) {
                countsNumbersMap.put(currentNum, countsNumbersMap.get(currentNum) + 1);
            } else {
                countsNumbersMap.put(currentNum, 1);
            }
        }

        for (Map.Entry<Double, Integer> entry : countsNumbersMap.entrySet()) {
            System.out.printf("%.0f -> %d%n", entry.getKey(), entry.getValue());
        }

    }
}