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Java Java Objects Creating the MVP Remaining Tries

Posted by Ewerton Luna
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Ewerton Luna
Full Stack JavaScript Techdegree Graduate 24,031 Points

"Resource Leak Scanner is Never closed"

Hey, everyone. I'm working on this Hangman game in my local computer and in this function

public boolean promptForGuess() {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter a letter: ");
        String guessInput = scanner.nextLine();
        char guess = guessInput.charAt(0);

        // asks to do scanner.close()

        return game.applyGuess(guess);
    }

VS code highlights scanner and displays this message "Resource leak: 'scanner' is never close".

The thing is that, when I use scanner.close() at the end of the method, when I enter my second guess, it always raises an error: java.util.NoSuchElementException: No line found

The code only works when it's done like Craig did, not closing the scanner.

I would really appreciate if someone could help me on this. Thank you!

1 Answer

Steven Parker
Steven Parker
229,732 Points
Steven Parker
Steven Parker
229,732 Points

It sounds like VSCode may be more stringent about resource management than the workspace. But I had an idea:

What if you made your "scanner" object global, created the new instance at the start of the "main" module, and then closed it right before that module ends?