What is the is a and has a relation ship in oops concept in
java?
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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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