Now it's possible to run your Java applications on the .NET framework without recompiling (on your part, at least. The system will recompile it though).
For more information, go to the blog for the development of a Java VM for .NET. For downloads, source snapshot, binaries.
In 2017, with the release of Delphi 10.2 Tokyo, Embarcadero introduced a specialized implementation of the Observer pattern into the System.Classes unit. While it has been in the wild for 9 years, it remains a "hidden" architecture for many, primarily because it serves as the invisible engine behind LiveBindings. Other than live bindings, you can also use the Observer pattern as a way to update component settings to the Windows registry, an .ini file, or persist it elsewhere.
System.Classes