What is an abstract class?

An abstract class is a class that is partially implemented. It provides design convenience. An abstract class is made up of one or more abstract methods that are declared but left unimplemented. An abstract class may also contain non-abstract methods. Abstract classes cannot be instantiated, but they can be subclassed. When an abstract class is subclassed, the subclass usually provides implementations for all of the abstract methods in its parent class. However, if it does not, the subclass must also be declared abstract.

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