Exam 4. Couples Frequency

import java.util.LinkedHashMap;
import java.util.Scanner;

public class _4_CouplesFrequency {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner scan = new Scanner(System.in);
        String inputLine = scan.nextLine().trim();

        String[] inputNums = inputLine.split(" ");

        LinkedHashMap<String, Integer> frequenciesMap = new LinkedHashMap<>();
        String couple;
        Integer times;
        for (int i = 0; i + 1 < inputNums.length; i++) {
            couple = inputNums[i] + " " + inputNums[i + 1];

            times = frequenciesMap.get(couple);
            if (times == null) {
                times = 0;
            }

            frequenciesMap.put(couple, times + 1);
        }

        float totalOccurrences = inputNums.length - 1;
        printTheFrequenciesOfAllCouples(frequenciesMap, totalOccurrences);
    }

    private static void printTheFrequenciesOfAllCouples(
            LinkedHashMap<String, Integer> frequenciesMap, float allOccurrences) {
        float percentage;
        for (String couple : frequenciesMap.keySet()) {
            System.out.print(couple + " -> ");
            percentage = (frequenciesMap.get(couple) * 100) / allOccurrences;
            System.out.printf("%.2f", percentage);
            System.out.println("%");
        }
    }
}