Test                                 Result
String[] words = {"caravan", "car", "van", "bike", "scooter", "vehicle", "bicycle"};

findChar('v', words);  Words containing the letter v : caravan van vehicle
findChar('i', words);  Words containing the letter i : bike vehicle bicycle

public static void findChar(Char character, String word) {
   for(String word:words) {
            // Check if it contains the character
            if (word.contains(Character.toString(character))) {
                wordsContainingCharacter.add(word);
            }

    if(.....size() > 0) {
            System.out.println("Words containing the letter " + character + " : " + ....);
        } else {
            System.out.println("Character is not in any word");
        }
    }
}