Java Keylistener JTextare

Question

public String letterTry() {
        String letterToTry;
        letterToTry=tryLetterJTextField.getText();
        return letterToTry;
    }

现在，我希望此方法等待用户按下Enter键，然后返回letterToTry并清除tryLetterJTextField。我正在尝试addKeyListener，但不幸的是我不理解它们，并且我已经尝试研究答案几个小时了。帮助将不胜感激 那是我的gui课

public class Demo extends KeyAdapter {

    private JFrame frame=new JFrame("Hangman");
    private JLabel firstLine=new JLabel("Guess title of this movie!");
    private JLabel encryptedMovieLabel=new JLabel();
    private Container container=new Container();
    private JTextField tryLetter=new JTextField();



    public void createGUI(String encryptedMovieTitle){

        firstLine.setBounds(20,10,200,20);

        encryptedMovieLabel.setBounds(20,30,200,20);
        encryptedMovieLabel.setText(encryptedMovieTitle);


        tryLetter.setBounds(20,60,200,20);
        container.setPreferredSize(new Dimension(300,300));
        container.setLayout(null);
        container.add(firstLine);
        container.add(encryptedMovieLabel);
        container.add(tryLetter);
        frame.add(container);
        frame.pack();
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);


    }
    public String letterTry() {
        String letterToTry;
        letterToTry=tryLetter.getText();
        return letterToTry;
    }

    }