How to avoid non-static method?

[linksterman]

Sorry for making another thread ( I actually solved my other one).

but this section of code I really need help on:

    public void shutDown()
    {
        out.println("close"); 
        out.flush();
        System.exit(0);
    }
    public static void main(String[] args) 
    {
        ClientGUI mainWindow = new ClientGUI();
        mainWindow.pack();
        mainWindow.addWindowListener(new WindowAdapter() 
        {public void windowClosing(WindowEvent e) 
            {shutDown();}
        });
        mainWindow.setResizable(false);
        mainWindow.setVisible(true);
    }

how do I get rid of the non-static method error? I searched but came up empty handed. It is really important I do those steps on shut down.

[Laharl]

You could just put the code in the addWindowListen er instead of calling shutDown(). Alternatively, you could (probably) make shutDown() static.

[linksterman]

You could just put the code in the addWindowListen er instead of calling shutDown(). Alternatively, you could (probably) make shutDown() static.

It i do that then it says "non-static variable out cannot be referenced from a static context"

in both ways that you mentioned.

[BigDaddyLH]

It i do that then it says "non-static variable out cannot be referenced from a static context"

in both ways that you mentioned.

You get get around that be defining a proper WindowAdapter subclass and make out a field in it.

Also, you may be interesting in shutdown hooks:

http://java.sun.com/javase/6/docs/api/java/lang/Runtime.html#addShutdownHook(java.lang.Thread)