Can I define an abstract class without adding an abstract method?
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Of course.
Declaring a class abstract only means that you don’t allow it to be instantiated on its own.
Declaring a method abstract means that subclasses have to provide an implementation for that method.
The two are separate concepts, though obviously you can’t have an abstract method in a non-abstract class. You can even have abstract classes with
finalmethods but never the other way around.