Method isVowel

CountVowelsStringInRanges.java:23–31

(String word)

    }

    public int isVowel(String word){
        HashSet<Character> set = new HashSet<>(Arrays.asList('a','e','i','o','u'));
        char first = word.charAt(0);
        char last = word.charAt(word.length()-1);
        if(set.contains(first) && set.contains(last)){
            return 1;
        }
        return 0;
    }
}