Need help with a wheel of fortune game

So, its sort of like hangman, All my code is able to do is to produce a random word, i have no idea how to change the letters in the string to this: "*", and how to change it back to the normal letters when the user guesses the write letter, please help.

Code :

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String dictionaryWord= " "; 
        String[] words =
            {
            "hospital", "house", "car", "banana", "petres", "fly", "money", "computer"
            }
            ;
 
        String prompt = "enter a letter: ";
        char letter;
        letter = prompt.charAt(0); 
 
 
        Random r = new Random ();
        dictionaryWord = words[r.nextInt(words.length)]; 
        String [] inviwords = new String [dictionaryWord.length()]; 
        for (int i = 0 ; i < dictionaryWord.length() ; i++)
        {
            c.setCursor (10, 10);
            inviwords [i] = "*";
            prompt += inviwords [i] + " ";
            c.println (words [i]);
 
        }

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Quote:

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how to change the letters in the string to this: "*",

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Quote:

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how to change it back to the normal letters

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Use the StringBuilder class to hold the letters of the word. You can index into the word and set the letters values.
Then create a String from the contents of the StringBuilder object.

Thanks, but could you give me an example or maybe help me out a little more on how to turn all the characters in the string to this "*" i dont really understand

Quote:

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how to turn all the characters in the string to this "*"

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You'd do it the other way. Start with a String of all *s and change them to the letters as they were guessed.
Several ways to get a Sting of *s. Take the length of the word and use it to substring from a long String like: "*****************************"
or use a loop to concatenate *s.