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) {
        try (Scanner scanner = new Scanner(System.in)) {
            String[] words =  scanner.nextLine().split("\\W+");
            TreeMap<String, Integer> wordOccurrences = new TreeMap<>();

            int maxWordCount = 0;
            for (String word : words) {
                word = word.toLowerCase();
                Integer wordCount = wordOccurrences.get(word);
                if (wordCount == null) {
                    wordCount = 0;
                }
                if (wordCount + 1 > maxWordCount) maxWordCount = wordCount + 1;
                wordOccurrences.put(word, wordCount + 1);
            }

            for (Map.Entry<String, Integer> entry : wordOccurrences.entrySet()) {
                if (entry.getValue() == maxWordCount) {
                    System.out.println(entry.getKey() + " -> "
                            + maxWordCount + " times");
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}