Answer / vishal singh

In an interface class, all methods are abstract - there is
no implementation. In an abstract class some methods can
be concrete - there can be implementation. In an interface
class, no accessibility modifiers are allowed - are public
by default. In an abstract class accessibility modifiers
are allowed.

Answer / anand

Abstract Class:

1. Abstract Class Can contain Abstract Methods and Non-
Abstract Methods.

2. When a Non-Abstract Class is Inherited from an Abstract
Class, the Non-Abstract Class should provide all the
implementations for the inherited Abstract Method.

Interface:

1. Interface is nothing but Pure Abstract Class ie
Interface can contain only the function declaration.

2. All the members of the interface are Public by Default
and you cannot provide any access modifiers.

3. When a class is inherited from the interface, the
inherited class should provide actual implementations for
the inherited members.

Answer / nasir munda

In abstract class public,private and protected method can used.

In Interface only public method can used.

Answer / nasir munda

Abstract Class may contain constructor but interface does
not contain constructor.

Answer / nitin kumar tomar

In interface All methods are abstract but in Abstract Class
some methods could be concrete.
There is no Methods Implimentation is allowed inside
interface and also No accessibility modifiers are not
allowed in interface.

Answer / jitendra yadav

Abstract Class may contain constructor but interface does
not contain constructor.

Answer / vanam santhosh

1.All the methods declared in interface are abstact whare
as Abstract must have atleast one abstact and others may
Concrete methods.
2.In abstact class Keyword is abstract must be used for the
methods.In Interface need not use the Keywords.
3.Abstact class must have subclass. where ads in Interfcs
need not have subclass.
4.In Abstarct class can extend only one class.where as in
Interface we can extend more than One Interface

Answer / munwar

Interface and abstract class are just same,but both have
their own usability and advantages..

Difference b/w both.
1). Interface is highlevel abstract(means there is no
single implementation), but in abstract class there can be
implementation.
2)Interface does not allow accessfiers like
public,private.. but abstract class allow these accessifiers

3) Interface does not supports contant values but abstract
calss supports constatnt values..

4) Interface supports multiple inheritance but class does
not support multiple inheritance..

5).interface can not implement abstract class but abstract
calss can impelment interface...

Answer / sanjay

In the abstract class we can define the member function
but in interface we can not define only declare the
function.

Answer / saurabh

you can define variables in abstract class but this is not
allowed in interfaces.

Why do we need constructor?

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