819. Most Common Word

class Solution {
    public String mostCommonWord(String paragraph, String[] banned) {
        Set<String> ban = new HashSet<>(Arrays.asList(banned));
        Map<String,Integer> counts = new HashMap<>();

        String[] words = paragraph.replaceAll("\\W+"," ").toLowerCase().split(" ");

        for (String w : words) {
            if (!ban.contains(w)) {
                counts.put(w, counts.getOrDefault(w,0) + 1);
            }
        }
        return Collections.max(counts.entrySet(),Map.Entry.comparingByValue()).getKey();
    }
}