8.17 Abstract Class in Java Tutorial Theory

An abstract class is an incomplete class. An abstract class is defined with the
keyword abstract . We cannot create an object of the abstract class because it is
not complete.
These classes cannot be instantiated and are either partially implemented or not at
all implemented.
This class contains one or more abstract methods which are simply method
declarations without a body.
This class is used when common features are shared by all object.

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