public class WordMatch {
    private String secret;

    public WordMatch(String word) {
        secret = word;
    }
    public int scoreGuess(String guess) {
        int guessLength = guess.length(); //Will be used to calculate score later

        //Count occurrences of substring
        int count = 0;
        for (int i = 0; i < secret.length() - guessLength + 1; i++) {
            if (secret.substring(i, i + guessLength).equals(guess)) {
                count++;
            }
        }

        return count * guessLength * guessLength; //Calculate and return score
    }
    public String findBetterGuess(String guess1, String guess2) {
        String returner = "";
        int score1 = scoreGuess(guess1);  //calculate scores of the two guesses
        int score2 = scoreGuess(guess2);
        if (score1>score2) {    //compare the scores
            returner = guess1;
        }
        else if (score2>score1) {
            returner = guess2;
        }
        else if (score1==score2) {   // if the scores are the same, output the alphabetically higher guess
            for (int i=0; i<guess1.length(); i++) {
                char char1 = guess1.charAt(i);
                char char2 = guess2.charAt(i);
                if (char1==char2) {
                    continue;
                }
                else if (char1>char2) {
                    returner = guess1;
                }
                else if (char1<char2) {
                    returner = guess2;
                }
            }
            }
        return returner;
    }
}

WordMatch wordmatch = new WordMatch("mississippi");
System.out.println(wordmatch.findBetterGuess("is", "issi"))
issi