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Serialization on JFrame -

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  Serialization on JFrame - "yancheng.cheok" <yancheng.cheok@THRWHITE.remove-dii-this> - 2011-04-27 15:32 +0000
    Re: Serialization on JFra "Andrew Thompson via JavaK" <andrew.thompson.via.javak@THRWHITE.remove-dii-this> - 2011-04-27 15:32 +0000
    Re: Serialization on JFra "Bart Cremers" <bart.cremers@THRWHITE.remove-dii-this> - 2011-04-27 15:32 +0000
    Re: Serialization on JFra "Tom Hawtin" <tom.hawtin@THRWHITE.remove-dii-this> - 2011-04-27 15:32 +0000

#1368 — Serialization on JFrame -

  To: comp.lang.java.gui
hello all,

i try to save my whole application, by performing serialization on my
JFrame, hoping the the GUI display, internal data can be restore back
to previous user setting.

however, i found that, after restoring, the main frame still can be
seen. however, all the action listener not longer work (i.e., i key in
a value in a text field and press enter, nothing happen).

my action listner is installed in the JMainFrame constructor.

i was wondering is it because during serialization loading, the
JMainFrame constructor is not being called? isn't the actione listener
itself should also being serialization loaded?

here is the snippet of my code. my serialization saving is done during
window closing, the my serialization loading (restoring) is done at
the start of the main function.

thanks

    private void formWindowClosing(java.awt.event.WindowEvent evt)
{
// TODO add your handling code here:
        saveApplication();
.......

    private boolean saveApplication() {
        try {
            FileOutputStream fos = new
FileOutputStream("application.ser");
            ObjectOutputStream out = new ObjectOutputStream(fos);
            out.writeObject(this.mainFrame);
            out.close();
        }
        catch(IOException exp) {
            exp.printStackTrace();
            return false;
        }

        return true;
    }

    private boolean saveApplication() {
        try {
            FileOutputStream fos = new
FileOutputStream("application.ser");
            ObjectOutputStream out = new ObjectOutputStream(fos);
            out.writeObject(this.mainFrame);
            out.close();
        }
        catch(IOException exp) {
            exp.printStackTrace();
            return false;
        }

        return true;
    }

    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                if((mainFrame = MainFrame.loadApplication()) != null)
{
                    mainFrame.setVisible(true);
                    System.out.println("success serialization
loading");
                }
                else {
                    mainFrame = new MainFrame();
                    mainFrame.setExtendedState(Frame.MAXIMIZED_BOTH);
 
mainFrame.setVisible(true);
                }
            }
        });
    }

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#1369 — Re: Serialization on JFra

  To: comp.lang.java.gui
yancheng.cheok@gmail.com wrote:
..
>i try to save my whole application, by performing serialization on my
>JFrame, hoping the the GUI display, internal data can be restore back
>to previous user setting.
..
>    private void formWindowClosing(java.awt.event.WindowEvent evt)
>{

2 Notes:
1) Compilable code will get more attention than code 
snippets.  I suggest you post SSCCE's.
<http://www.physci.org/codes/sscce.html>
2) Another thing that encourages people to help is to 
make your text easy to read.  Using a single UpperCase 
letter at the start of each sentence, and for *every* use 
of the word 'I', makes it easy for the reader to scan posts, 
looking for key phrases.

-- 
Andrew Thompson
http://www.athompson.info/andrew/

Message posted via http://www.javakb.com

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#1370 — Re: Serialization on JFra

  To: comp.lang.java.gui
On Apr 2, 4:53 am, yancheng.ch...@gmail.com wrote:
> hello all,
>
> i try to save my whole application, by performing serialization on my
> JFrame, hoping the the GUI display, internal data can be restore back
> to previous user setting.
>
> however, i found that, after restoring, the main frame still can be
> seen. however, all the action listener not longer work (i.e., i key in
> a value in a text field and press enter, nothing happen).
>
> my action listner is installed in the JMainFrame constructor.
>
> i was wondering is it because during serialization loading, the
> JMainFrame constructor is not being called? isn't the actione listener
> itself should also being serialization loaded?
>
> here is the snippet of my code. my serialization saving is done during
> window closing, the my serialization loading (restoring) is done at
> the start of the main function.
>
> thanks
>
>     private void formWindowClosing(java.awt.event.WindowEvent evt)
> {
> // TODO add your handling code here:
>         saveApplication();
> .......
>
>     private boolean saveApplication() {
>         try {
>             FileOutputStream fos = new
> FileOutputStream("application.ser");
>             ObjectOutputStream out = new ObjectOutputStream(fos);
>             out.writeObject(this.mainFrame);
>             out.close();
>         }
>         catch(IOException exp) {
>             exp.printStackTrace();
>             return false;
>         }
>
>         return true;
>     }
>
>     private boolean saveApplication() {
>         try {
>             FileOutputStream fos = new
> FileOutputStream("application.ser");
>             ObjectOutputStream out = new ObjectOutputStream(fos);
>             out.writeObject(this.mainFrame);
>             out.close();
>         }
>         catch(IOException exp) {
>             exp.printStackTrace();
>             return false;
>         }
>
>         return true;
>     }
>
>     public static void main(String args[]) {
>         java.awt.EventQueue.invokeLater(new Runnable() {
>             public void run() {
>                 if((mainFrame = MainFrame.loadApplication()) != null)
> {
>                     mainFrame.setVisible(true);
>                     System.out.println("success serialization
> loading");
>                 }
>                 else {
>                     mainFrame = new MainFrame();
>                     mainFrame.setExtendedState(Frame.MAXIMIZED_BOTH);
>
> mainFrame.setVisible(true);
>                 }
>             }
>         });
>     }

As far as I remember Listeners are transient by default, but some
special handling on Component level ensures that listeners can be
serialized if and only if they are Serializable themselves.

Regards,

Bart

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#1371 — Re: Serialization on JFra

  To: comp.lang.java.gui
yancheng.cheok@gmail.com wrote:
> 
> i try to save my whole application, by performing serialization on my
> JFrame, hoping the the GUI display, internal data can be restore back
> to previous user setting.

Have you read this?

"Warning:  Serialized objects of this class will not be compatible with 
future Swing releases. The current serialization support is appropriate 
for short term storage or RMI between applications running the same 
version of Swing. ..."

The root problems are that Swing has some eccentric design decisions 
and, like all public interfaces, serialised forms should have some 
thought applied to them if you don't want them to be a mess.

Tom Hawtin

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