What is a superclass?

Answer 1

Super class (parent class, base class) is one class that another class(es) has extended it to add properties/functionalities to it. Concrete classes (drived class, child class) inherit from the superclass.

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Answer 2

Inheritance is a relationship between two classes such that one is a subclass of the other — this other one is called a superclass of the first one.

For example, you may have an Animal class, which contains all the information and behavior that an Animal object should have. Then you can create a Dog class. Of course, a Dog is a subtype of Animal, so the Dog class should be a subclass of Animal. Then you say that the Animal class is a superclass of Dog.

Answer 3

class A {}
class B extends A {}

A is the superclass of B in this example.