Pass JFrame to actionlistener

Hello,
I created a class in a frame with menu. Depending on which item is clicked in the menu to another panel to the frame to be added. Especially should it become a Sudoku 9x9 box, and another time a 16x16 Sudoku field. The 'order' sake, I've outsourced all events in a different class. But how can I tell the class "events" which is frame? Can you please provide me this logic? If you have any source code then it would be great. Thank you.

Hello,

Try the following code

Code:

---

public class Frame (
 
    public static void main(String[] args) (
        JFrame frm1 = new JFrame("Sudoku Solver");
        frm1.setSize(500,500);
        frm1.setResizable(false);
        frm1.setLocationRelativeTo(null);         
        frm1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
               
        JMenuBar mb = new JMenuBar();
        frm1.setJMenuBar(mb);
       
        JMenu prg = new JMenu("Program");
        mb.add(prg);
       
        JMenuItem ext = new JMenuItem("Exit");
        prg.add(ext),
        ext.addActionListener(new events.exitaction());
       
        JMenu vrt = new JMenu("vrt");
        mb.add(variant);
       
        JMenu sdk = new JMenu("Sudoku - normal");
        JMenuItem sudo = new JMenuItem("9x9 Sudoku field");
        JMenuItem sudokun16mal16 = new JMenuItem("16x16 Sudoku box);     
        sdk.add(sudo);
        sudo.addActionListener(new events.sudo());
        sdk.add(sudokun16mal16);
       
        JMenuItem sudotst = new JMenuItem("Killer Sudoku");     
        variations.add(sdk);
        variations.add(sudotst);
 
        frm1.setVisible(true);
    )
)

---

Hello,
Alternatively you can try the following code

Code:

---

public class Events (
   
    public static class ext implements ActionListener(
        public void actionPerformed (ActionEvent e)(
            System.exit(0);
        )
    )
   
    static class sudo implements ActionListener(
        public void actionPerformed (ActionEvent e)(
            JPanel pn = new JPanel();
            frame1.add(pn);                                          / / here is the problem
            JLabel lbl = new JLabel("test");
            pn.add(lbl);
        )
    )
)

---

Hello,
In your code the class sudo a JFrame is passed as the attribute would look like this:

Code:

---

static class sudo implements ActionListener(
  private JFrame frm;
 
  public sudo(JFrame frame) (
    this.frm = frame;
  )

---

The rest can be dismissed easily, then you should not have any problem to access it from your code. I hope this will help.

Hello,
In your case I think the outsourcing Overkill the part of the code. Your Events are not exactly complex, I think with anonymous classes is clearer and not so cumbersome for the frame access.

Code:

---

sudo.addActionListener(new ActionListener()(
      @ Override
      public void actionPerformed(ActionEvent e)(
            frm.add(...); frm must be declared as final Attention / /!
      )
));

---

Incidentally, the complete code of the main method you should pack in a Runnable, for example

Code:

---

EventQueue.invokeLater (testrun); run.

---

Hello,
Thank you for your replies, only one question - in the action listener can I create a label and add it to the panel and the frame added? It is not displayed, only when I have a renewed "frm.setVisible (true). Why do I run the command again, but the frame is already displayed?