Answer Posted / rakesh kumar jha

Abstract class:-
1. if we declare ny class as a abstract, then we can't
create an object/instace of that class explicitly.
2.afbstracts class may or may not contain abstract method.
3. if on declare any method as an abstract, then the class
should be declared as abstract.
4.if a method is declared as abstract in abstract class,
then child bound to define the abstract method of parent.
5.abstract class may contain constructor.
6.abstract class may hold the child object.
Interface class:-
1.by default all method be abstract.
2.class can implements more than one interface class.
3.child should give the body of all method of interface
class, but if a child class with abstract keyword, then nod
need to give the body of interface classes method.
4.interface can't create objects but can hold the object of
child.
5. variable in interface class are by default public,
static and final.
6.we can't use the final, static, native,synchronous
keyword with the methods define in interface.
7. we can't declare interface as final.


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