Piglatin

public class Piglatin
{
    private static final char[] vowels = { 'a', 'e', 'i', 'o', 'u' };

    private static String translateWord(String word) {
        int start = 0;
        int firstVowel = 0;
        int end = word.length();

        for(int j = 0; j < end; j++) {
            char c = Character.toLowerCase(word.charAt(j));
            if(contains(vowels, c)) {
                firstVowel = j;
                break;
            }
        }

        if(start != firstVowel) {
            String startString = word.substring(firstVowel, end);
            String endString = word.substring(start, firstVowel) + "ay";
            return startString.toLowerCase() + endString.toLowerCase();
        } else {
            return word + "yay";
        }
    }

    private static boolean contains(char[] vowels, char target) {
        for (char c : vowels) {
            if (c == target) {
                return true;
            }
        }
        return false;
    }

    private static String translateSentence(String sentence) {
        StringBuilder sb = new StringBuilder();
        String[] tokens = sentence.split(" ");

        for (int i = 0; i < tokens.length; i++) {
            if (i < tokens.length - 1) {
                sb.append(translateWord(tokens[i])  + " ");
            } else {
                sb.append(translateWord(tokens[i]));
            }
        }

        return sb.toString() + ".".toLowerCase();
    }

    public static void main(String[] args)
    {
        String sentence = translateSentence("I am nick Adamou");
        System.out.printf("%s%n", sentence);

    }
}