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Ah I'm glad to see you revised your post haha! :)

I don't think you can just print guessedLetters like you have.

Try this:

import java.util.Arrays;
.
.
.

If I were you I'd start with some pseudo code and then start programming it and if you run into any errors it would be a lot easier to help.

Something like:
While loop to keep the user entering...