Solution for HiddenWord Free Response - https://compsci.rocks/hiddenword-solution/

HiddenWord.java

public class HiddenWord {
    private String word;
    
    public HiddenWord(String w) {
        word = w; 
    }
    
    public String getHint(String guess) {
        String out = "";
        
        for (int i=0; i<guess.length(); i++) {
            String guessCharacter = guess.substring(i, i+1);
            String wordCharacter = word.substring(i, i+1);
            if (guessCharacter.equals(wordCharacter)) {
                out += guessCharacter;
            }
            else if (word.indexOf(guessCharacter) >= 0) {
                out += "+";
            }
            else {
                out += "*";
            }
        }
        
        return out; 
    }
}