Answer Posted / kishor patil

Inheritance defines the relationship is-a(also called the
superclass-subclass relationship) between a superclass and
it's subclasses. This means that an object of a subclass
is-a superclass object,and can be used wherever an object
the of superclass can be used.

For EX-Suppose person is a superclass of Teacher
class,Driver class,Engineer class.

Here we can say every Teacher is person,Every Driver is
a person,And Every Engineer is a person ,but vice -versa
not true i.e Every person can not be teacher or driver or
Engineer.


Aggregation Defines the relationship has-a(also called
whole-part relatioship)between an instance of class and
it's constituents(also called parts).Aggregation comprises
the usage of objects.

We can say that a composite object built from the
constituent objects that are its parts .


For EX- Vehical is class.

vehical has a wheel,
vehical has a engine,
vehical has a stearing ,
vehical has a gear.


means vehical has a parts like
wheel,engine ,stearing ,gear.

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