[pjmlp]

Initially seen in languages like Eiffel and Delphi.

[Gibbon1]

I have basically no experience with Java. But in C# I think the above is whats behind stuff like

fooobj.events += my_eventhandler;

[pjmlp]

It is, but those languages did it about 6 years before C# came into existence.

Which isn't surprising, given that Delphi took the idea from Eiffel, which share the same Pascal influence, and was designed by Anders.

[Gibbon1]

Not to mention Anders and C#.