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- /*
- Copyright (c) Xerox Corporation 1998-2002. All rights reserved.
-
- Use and copying of this software and preparation of derivative works based
- upon this software are permitted. Any distribution of this software or
- derivative works must comply with all applicable United States export control
- laws.
- */
-
- package bean;
-
- import java.beans.*;
- import java.io.*;
-
- public class Demo implements PropertyChangeListener {
-
- static final String fileName = "test.tmp";
-
- /**
- * when Demo is playing the listener role,
- * this method reports that a propery has changed
- */
- public void propertyChange(PropertyChangeEvent e){
- System.out.println("Property " + e.getPropertyName() + " changed from " +
- e.getOldValue() + " to " + e.getNewValue() );
- }
-
- /**
- * main: test the program
- */
- public static void main(String[] args){
- Point p1 = new Point();
- p1.addPropertyChangeListener(new Demo());
- System.out.println("p1 =" + p1);
- p1.setRectangular(5,2);
- System.out.println("p1 =" + p1);
- p1.setX( 6 );
- p1.setY( 3 );
- System.out.println("p1 =" + p1);
- p1.offset(6,4);
- System.out.println("p1 =" + p1);
- save(p1, fileName);
- Point p2 = (Point) restore(fileName);
- System.out.println("Had: " + p1);
- System.out.println("Got: " + p2);
- }
-
- /**
- * Save a serializable object to a file
- */
- static void save(Serializable p, String fn){
- try {
- System.out.println("Writing to file: " + p);
- FileOutputStream fo = new FileOutputStream(fn);
- ObjectOutputStream so = new ObjectOutputStream(fo);
- so.writeObject(p);
- so.flush();
- } catch (Exception e) {
- System.out.println(e);
- System.exit(1);
- }
- }
-
- /**
- * Restore a serializable object from the file
- */
- static Object restore(String fn){
- try {
- Object result;
- System.out.println("Reading from file: " + fn);
- FileInputStream fi = new FileInputStream(fn);
- ObjectInputStream si = new ObjectInputStream(fi);
- return si.readObject();
- } catch (Exception e) {
- System.out.println(e);
- System.exit(1);
- }
- return null;
- }
- }
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