public class MyView extends ViewPart implements ISelectionListener{

public void createPartControl(Composite parent) {

// add this view as a selection listener to the workbench page
getSite().getPage().addSelectionListener((ISelectionListener) this);

}

// Implement the method defined in ISelectionListener, to consume UI selections
public void selectionChanged(IWorkbenchPart part, ISelection selection) {
//Examine selection and act on it!
}

}

public void createPartControl(Composite parent) {
// Set up a JFace Viewer
viewer = new TableViewer(parent, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL);
viewer.setContentProvider(new ViewContentProvider());
viewer.setLabelProvider(new ViewLabelProvider());
viewer.setSorter(new NameSorter());
viewer.setInput(getViewSite());

// ADD the JFace Viewer as a Selection Provider to the View site.
getSite().setSelectionProvider(viewer);

}

class CityClass implements IAdaptable {
　private String cityName;

　public CityClass(String name) {
　　this.name = name;
　}
　public String getName() {
　　return name;
　}
　public CityClass getParent() {
　　return parent;
　}
　public String toString() {
　　return getName();
　}
　public Object getAdapter(Class key) {
　　if (key.getName().equals("ITransportationInfo"))
　　　return CityPlugin.getInstance().getTransportAdapter();
　　else (key.getName().equals("IPlacesInfo"))
　　　return CityPlugin.getInstance().getPlacesAdapter();
　　return null;
　}
}

//To add a listener for property changes to this notifier:

public void addPropertyChangeListener(IPropertyChangeListener listener);

//To remove the given content change listener from this notifier:

public void removePropertyChangeListener(IPropertyChangeListener listener);

class CityPopulationPlugin {
　ArrayList myListeners;

　// A public method that allows listener registration
　public void addPropertyChangeListener(IPropertyChangeListener listener) {
　　if(!myListeners.contains(listener))
　　　myListeners.add(listener);
　}

　// A public method that allows listener registration
　public void removePropertyChangeListener(IPropertyChangeListener listener) {
　　myListeners.remove(listener);
　}

　public CityPopulationPlugin (){
　　// method to start the thread that invokes the population \
　　web service once every hour
　　// and then notifies the listeners via the propertyChange() callback method.
　　initWebServiceInvokerThread( myListeners );
　}

　void initWebServiceInvokerThread(ArrayList listeners) {
　　// Code to Invoke Web Service Periodically, and retrieve information

　　// Post Invocation, inform listeners
　　for (Iterator iter = listeners.iterator(); iter.hasNext();) {
　　　IPropertyChangeListener element = (IProperty\
　　　ChangeListener) iter.next();
　　　element.propertyChange(new PropertyChangeEvent(this, \"CitiesWeatherXML" , null , CityWeatherXMLObj));
　　}
　}
}

class MyView implements IPropertyChangeListener {

　public void createPartControl() {
　　//register with a Known Plugin that sources Population Data
　　CityPopulationPlugin.getInstance().addPropertyChangeListener(this);
　}

　public void propertyChange(PropertyChangeEvent event) {

　　//This view is interested in the Population Counts of the Cities.
　　//The population data is being sourced by another
　　plugin in the background.

　　if( event.getProperty().equals("CitiesWeatherXML")) {
　　　Object val = event.getNewValue();
　　　// do something with val
　　}
　}
}