Swing i shutdownhook

Dokumentation siger:

Shutdown hooks run at a delicate time in the life cycle of a virtual machine and should therefore be coded defensively. They should, in particular, be written to be thread-safe and to avoid deadlocks insofar as possible. They should also not rely blindly upon services that may have registered their own shutdown hooks and therefore may themselves in the process of shutting down. Attempts to use other thread-based services such as the AWT event-dispatch thread, for example, may lead to deadlocks.

jeg ville ikke være vildt overrasket, hvis der også var problemer med Swing !

Jeg tror at du skal satse på en WindowListener - den bliver også kaldt hvis man klikker
på krydset.

lyder som en god ide. vil prøve det når jeg får tid i morgen

Til inspiration:

import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;

import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.SwingUtilities;

public class ExitHandling extends JFrame implements WindowListener {
    public ExitHandling() {
        setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
        setTitle("Exit handling demo");
        setSize(300, 300);
        addWindowListener(this);
    }
    @Override
    public void windowActivated(WindowEvent e) {
    }
    @Override
    public void windowClosed(WindowEvent e) {
    }
    @Override
    public void windowClosing(WindowEvent e) {
        switch(JOptionPane.showConfirmDialog(null, "Save?")) {
            case JOptionPane.YES_OPTION:
                // save file
                dispose();
                break;
            case JOptionPane.NO_OPTION:
                dispose();
                break;
            case JOptionPane.CANCEL_OPTION:
                // nothing
                break;
        }
    }
    @Override
    public void windowDeactivated(WindowEvent e) {
    }
    @Override
    public void windowDeiconified(WindowEvent e) {
    }
    @Override
    public void windowIconified(WindowEvent e) {
    }
    @Override
    public void windowOpened(WindowEvent e) {
    }
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                JFrame f = new ExitHandling();
                f.setVisible(true);
            }
        });
    }
}

Det er sku i orden
Hvis du sender et svar så.

kommer her

Tak for hjælpen

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