11. Most Frequent Word

import java.util.Map;
import java.util.Scanner;
import java.util.TreeMap;


public class _11_MostFrequentWord {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String[] words = sc.nextLine().toLowerCase().split("\\W+");

        Map<String, Integer> wordCounter = new TreeMap<>();

        for (String word : words) {
            if(wordCounter.containsKey(word)) {
                wordCounter.put(word, wordCounter.get(word) + 1);
            }
            else
                wordCounter.put(word, 1);
        }

        int mostFrequent = 0;
        for (Map.Entry<String, Integer> word : wordCounter.entrySet()) {
            if (mostFrequent < word.getValue())
                mostFrequent = word.getValue();
        }

        for (Map.Entry<String, Integer> word : wordCounter.entrySet()) {
            if (mostFrequent == word.getValue())
                System.out.println(word.getKey() + " -> " + word.getValue());
        }
    }

}