This program demonstrates the use of an XML encoder and decoder to save and restore a frame
/* This program is a part of the companion code for Core Java 8th ed. (http://horstmann.com/corejava) This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . */ import java.awt.*; import java.awt.event.*; import java.beans.*; import java.io.*; import javax.swing.*; /** * This program demonstrates the use of an XML encoder and decoder to save and restore a frame. * @version 1.01 2007-10-03 * @author Cay Horstmann */ public class PersistentFrameTest { public static void main(String[] args) { chooser = new JFileChooser(); chooser.setCurrentDirectory(new File(".")); PersistentFrameTest test = new PersistentFrameTest(); test.init(); } public void init() { frame = new JFrame(); frame.setLayout(new FlowLayout()); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setTitle("PersistentFrameTest"); frame.setSize(400, 200); JButton loadButton = new JButton("Load"); frame.add(loadButton); loadButton.addActionListener(EventHandler.create(ActionListener.class, this, "load")); JButton saveButton = new JButton("Save"); frame.add(saveButton); saveButton.addActionListener(EventHandler.create(ActionListener.class, this, "save"));
frame.setVisible(true); } public void load() { // show file chooser dialog int r = chooser.showOpenDialog(null); // if file selected, open if(r == JFileChooser.APPROVE_OPTION) { try { File file = chooser.getSelectedFile(); XMLDecoder decoder = new XMLDecoder(new FileInputStream(file)); decoder.readObject(); decoder.close(); } catch (IOException e) { JOptionPane.showMessageDialog(null, e); } } } public void save() { if (chooser.showSaveDialog(null) == JFileChooser.APPROVE_OPTION) { try { File file = chooser.getSelectedFile(); XMLEncoder encoder = new XMLEncoder(new FileOutputStream(file)); encoder.writeObject(frame); encoder.close(); } catch (IOException e) { JOptionPane.showMessageDialog(null, e); } } } private static JFileChooser chooser; private JFrame frame; }