How do you switch between multiple JPanles in an application window?

Asked Nov 23 '17 at 13:55

Active Nov 23 '17 at 14:51

Viewed 36 times

I have tried to setVisible(null); but it produces an java.lang.NullPointerException. the JPanel setLayout(null); which I think is the issue, I don't know how to resolve it. I,m using a card layout to reduce windows in the application. Any help would be appreciated.

final JPanel Signin = new JPanel();
contentPane.add(Signin, "name_12988058891368");
Signin.setLayout(null);

JButton btnNewButton = new JButton("New button");
btnNewButton.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent arg0) {
        Signin.setVisible(false);
        Home.setVisible(true);
    }
}

edited Nov 23 '17 at 14:20

Hovercraft Full Of Eels

283,665
25
256
373

asked Nov 23 '17 at 13:55

Paolok59717

[So many similar questions](https://www.google.com/search?q=site%3Astackoverflow.com+java+swap+jpanels). In the future, please search first. – Hovercraft Full Of Eels Nov 23 '17 at 13:57
And no, setting the layout to null isn't the issue. To debug a NPE, see the [canonical question on the subject](http://stackoverflow.com/questions/218384/what-is-a-nullpointerexception-and-how-do-i-fix-it) – Hovercraft Full Of Eels Nov 23 '17 at 13:58
Question closed as a duplicate. If you feel it was closed incorrectly, then please create and post your valid [mcve] and we'll see. – Hovercraft Full Of Eels Nov 23 '17 at 13:58

How do you switch between multiple JPanles in an application window?

0 Answers0