is a subclass an instance of a superclass

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Putting common code in a superclass, then having subclasses inherit from it - they get all of its instance variables and methods.

Is a subclass an instance of its superclass?
A subclass inherits the methods and instance data of its superclasses, and is related to its superclasses by an is-a relationship. For example, if subclass P inherits from superclass Q, and subclass Q inherits from superclass S, then an instance of P is an instance of Q and also (by transitivity) an instance of S.
Is a subclass an object of superclass?
ANS: b. A superclass object is a subclass object.
Can subclasses access superclass instance variables?
Subclasses inherit public methods from the superclass that they extend, but they cannot access the private instance variables of the superclass directly and must use the public accessor and mutator methods.
Definition: A subclass is a class that derives from another class. A subclass inherits state and behavior from all of its ancestors. The term superclass refers to a class's direct ancestor as well as all of its ascendant classes.

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