Map 다루기

 put, getOrDefault

*put, getOrDefault

Map<String, Integer> map = new HashMap<>();
for(String word: words){
    String sanitized = word.trim();
    if(!bannedSet.contains(sanitized) && !sanitized.isEmpty()){
        map.put(sanitized, map.getOrDefault(sanitized,0)+1);
    }
}

*entry traverse

for(Map.Entry<String,Integer> entry : map.entrySet()){
    if(entry.getValue()>count){
        Integer count= entry.getValue();
        String result = entry.getKey();
    }
}