Answer / naveen

Interface is a specification it tells a class has what to do.
It is purely abstract class it contains abstract methods and final static variables.
Generally begining of the project PM or TL are providing the Interfaces, developers are implementing the Interfaces.

Abstract class

Abstract class is a mediator between Interface and Class , any common code is their that code written in Abstract class and then extend the Abstract class. Abstract class containing abstract and concreate methods.
Abstract class are used in Designing level.If take java predifined class we understand easily.

Answer / surender kannuri

interface is a specification of method prototype.

all methods in interface are abstract and final.

interface methods are public since they should be available
to third party vendor to provide implementation.they are
abstract because their implementation is left for third
party vendors.


interface contains 0 or more abstract methods.

all methods of interface should implemented in implemented
class.if any method is not implemented then implementation
class should be declared as abstract.

we can't create object to interface.but we can create
reference to interface type.

an interface contains variables ,such as public.static and
final variables.this means all variables of interface are
constant.

an interface cannot implements another interface.
an interface can extend another interface.

it is possible to write a class within an interface.
a class can implements(not extend) multiple interfaces.


abstract class contains 0 or more abstract methods.
all methods of abstract class should be implemented in
subclasses only.
all methods of abstract class should be declared by using
abstract keyword.
we can't create an object to abstract class.

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