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> Using ADT to mean “abstract data type” does not mean anything more than what most people mean when they say “type”.

Abstract data type is a type where you don't get direct access to the information contained in it. The encapsulation is what makes it "abstract".

We should call it an opaque data type then.

That thing was named much before the other ADT became popular. The name is spread over a lot of past texts, and not in wide use anymore.

There's no point in changing anything.

Is a Java ArrayList considered an ADT like stack, queue, set, etc?