For views you use methods on the current workbench page IWorkbenchPage
. You can find the page with:
IWorkbenchPage page = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage();
(this must be called from a plugin with the workbench running).
You can find an existing view with:
page.findView(id);
and create and show a view with:
page.showView(id);