Eclipse RCP : Execute a command programatically

using the folowing code we can execute a command in eclipse rcp:

IHandlerService handlerService = (IHandlerService) PlatformUI.getWorkbench().getService(IHandlerService.class);
try {
handlerService.executeCommand("org.eclipse.ui.ToggleCoolbarAction", null);
} catch (NotDefinedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NotEnabledException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NotHandledException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}