My New Game JButton is not working?

Question

Hi I am currently working on an assignment which I have 98% finished. I have made gui program where it has a jtextfield set to 0 but as you play the game it changes.

Now I have created a j button called "NEW GAME" and "QUIT". My Quit button works fine when clicked. but my new game button is my problem.

I want it so that when I click the button it sets the score to 0

 public ShinyButtonsGUIProgramToShare(String tit, int x, int y) {
        //The button GUI
        ShinyButtonsGUIToShare sbg = new ShinyButtonsGUIToShare("NYI", 552, 552, new ShinyButtons());
        sbg.setLocation(10, 10);
        getContentPane().add(sbg);
        //The score text and text box
        JLabel jlb = new JLabel("Score: ");
        jlb.setLocation(12, (y - 75));
        jlb.setSize(45, 40);
        getContentPane().add(jlb);

        JTextField jtf = new JTextField("0");
        jtf.setLocation(60, (y - 70));
        jtf.setSize(150, 30);
        jtf.setHorizontalAlignment(JTextField.RIGHT);
        getContentPane().add(jtf);


        JButton NewGame, Quit;
        NewGame = new JButton("New Game");
        Quit = new JButton("Quit");

        Quit.addActionListener(new ActionListener(){
          public void actionPerformed(ActionEvent e) { 
            System.exit(0); 
          }});

        NewGame.addActionListener(new ActionListener(){
          public void actionPerformed(ActionEvent e) { 
          JTextField jtf.setText("0");
          }});


        NewGame.setLocation((x - 220), (y - 70));
        NewGame.setSize(100, 30);
        getContentPane().add(NewGame);

        Quit.setLocation((x - 110), (y - 70));
        Quit.setSize(100, 30);
        getContentPane().add(Quit);
        setDefaultCloseOperation(EXIT_ON_CLOSE); // allow window to close 
        setSize(x, y);
        setLayout(null);
        setResizable(false);
    }

    public static void main(String[] args) {
        ShinyButtonsGUIProgramToShare sbgp = new ShinyButtonsGUIProgramToShare("Shiny   Buttons", 578, 634);
        sbgp.setVisible(true);
    }
}

Answer 1

You have a context issue...

The instance of jtf can not be referenced from within the context of the NewGame's ActionListener

You need to make jtf and instance variable so it can be accessed from anywhere within an instance of ShinyButtonsGUIProgramToShare object.

Take a look at Understanding Class Members and Code Conventions for the Java Programming Language