Use of PropertyChangeListeners in realtime scenario apps

Question

Dear experts,
I always reach at this topic and i feel to ignore this topic.I have used ResourceBundle class also for getting and retreving properties and i feel Bean is useful in JSP as well.But how this code can help me in my applications that are standalone.I mean how can i take benefit ?.I am not looking to make eclipse workbench
where i have to handle so many user interactions for properties.
import java.io.Serializable;
public class Bean implements Serializable
private String name = new String();
private String address = new String();
public void setName(String name)
this.name = name;
public String getName()
return(name);
public void setAddress(String address) {
this.address = address;
public String getAddress(String address) {
return(address);
import java.beans.*;
import java.util.*;
public class ValueChanger implements PropertyChangeListener
private PropertyChangeSupport changeSupport;
Bean b;
ValueChanger()
b = new Bean();
changeSupport = new PropertyChangeSupport(b);
changeSupport.addPropertyChangeListener(this);
changeSupport.firePropertyChange("name", "", "Aditya Sharma" );
changeSupport.firePropertyChange("address", "", "Ghaziabad" );
public void propertyChange(PropertyChangeEvent evt)
String pname = evt.getPropertyName();
System.out.println("Property of "+ pname+ " has changed");
public static void main(String args[])
new ValueChanger();
}

Answer 1

So what if you find,you haven't climbed Pisa tower.This is the revised code.I wonder so bulky codings for most trivial tasks.
import java.beans.*;
import java.util.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class ValueChanger extends JFrame implements PropertyChangeListener,ActionListener,MouseListener
private PropertyChangeSupport changeSupport;
JLabel l_1;
JLabel l_2;
JTextField t1;
JTextField t2;
JButton b1;
Bean b;
String old_t1,old_t2;
ValueChanger()
old_t1 = new String();
old_t2 = new String();
setSize(650,150);
setLayout(new FlowLayout());
l_1 = new JLabel("Name");
l_2 = new JLabel("Address");
t1 = new JTextField(20);
t1.addMouseListener(this);
t2 = new JTextField(25);
t2.addMouseListener(this);
b1 = new JButton("Detect");
b1.addActionListener(this);
add(l_1);
add( t1);
add(l_2);
add(t2);
add(b1);
setVisible(true);
public void propertyChange(PropertyChangeEvent evt)
String pname = evt.getPropertyName();
System.out.println("Property of "+ pname+ " has changed");
System.out.println("Old value = "+evt.getOldValue());
System.out.println("New value = "+evt.getNewValue()+"\n"+"\n");
public void actionPerformed(ActionEvent ev)
Object ob = ev.getSource();
if (ob == b1) {
b = new Bean();
changeSupport = new PropertyChangeSupport(b);
changeSupport.addPropertyChangeListener(this);
changeSupport.firePropertyChange("name", old_t1, t1.getText() );
changeSupport.firePropertyChange("address", old_t2, t2.getText() );
public static void main(String args[])
new ValueChanger();
public void mousePressed(MouseEvent e) {
    public void mouseReleased(MouseEvent e) {
    public void mouseEntered(MouseEvent e) {
     Object ob = e.getSource();
     if (ob == t1)  {
     old_t1 = t1.getText();
     if ((ob == t2) ) {
     old_t2 = t2.getText();
    public void mouseExited(MouseEvent e) {
    public void mouseClicked(MouseEvent e) {
}