import java.beans.*;
import java.io.*;

public class TestBeanPropertyChangeDemo implements PropertyChangeListener {

protected TestBean ourBean;

//-------------------------------------------------------------------
// main() entry point
//-------------------------------------------------------------------
public static void main (String[] args) {
	new TestBeanPropertyChangeDemo();
}
//-------------------------------------------------------------------
// TestBeanPropertyChangeDemo Constructor
//-------------------------------------------------------------------
public TestBeanPropertyChangeDemo() {

	ourBean = (TestBean) newBean("TestBean");
	if ( ourBean == null ) {
		System.out.println("Could not instantiate TestBean.");
		System.exit(10);
	}

	// register us as interested in button property changes
	ourBean.addPropertyChangeListener(this);

	// modify one of our bean's properties
	ourBean.setGlitzyProperty(1234);

	// quit
	System.exit(0);
}
//-------------------------------------------------------------------
// propertyChange() is the method we have to implement from interface
// PropertyChangeListener. Here we hear of OurButton properties changing.
//-------------------------------------------------------------------
public void propertyChange(PropertyChangeEvent pcEvent) {
String changedProperty;
Object oldPropertyValue, newPropertyValue;

	changedProperty		= pcEvent.getPropertyName();
	oldPropertyValue	= pcEvent.getOldValue();
	newPropertyValue	= pcEvent.getNewValue();

	System.out.println("TestBean property '"+ changedProperty  +"'");
	System.out.println(".. changed from   '"+ oldPropertyValue +"'");
	System.out.println(".. to             '"+ newPropertyValue +"'");
}
//-------------------------------------------------------------------
// Utility method to instantiate a bean.
//-------------------------------------------------------------------
public static Object newBean(String beanName) {
Object aBean;

	try {
		aBean = Beans.instantiate(null, beanName);

	} catch (ClassNotFoundException noSuchBean) {
		System.out.println("newBean() failed: "+ noSuchBean);
		return null;
	} catch (IOException beanIOerror) {
		System.out.println("newBean() I/O error while loading bean: " + beanIOerror);
		return null;
	}
	return aBean;
}
} // End of Class TestBeanPropertyChangeDemo