Answer / matt s

An interface definition specifies the 'intent' of a public
interface without forcing a base implementation. It's more
used (in favour of base or abstract classes) in cases where
the interface defines some common 'high level'
characteristics or concepts for completely different
implementations - e.g:

A 'dog' interface may be specified with common methods such
as 'scratch' and 'bark', but each type of dog's
implementation of those would be completely different.
It's still a useful design feature however as it recognises
there are similarities at the higher 'behaviour' level.

Answer / guest

when classes follow same signature, then use interface.
Interfaces describes peripheral activities of objects.

Answer / arvind nagar

Interface is mainly use to apply restrictions in accesing
the members.
For eg.-
using System;
Interface Sales
{
Void prediction();
}
Interface Hr
{
Void SalayInfo();
}
Class Abc:Sales,Hr
{
Public void Pediction()
{
x.WriteLine("Sales for 2008 will 2000 laptops");
}
Public void SalryInfo()
{
x.WriteLine("Salary is going to increment by 30%");
}
Public void Hello()
{
x.WriteLine("Hello frnds");
}
}
class test
{
public static void main()
{
Hr a= new Abc();
a.SalaryInfo();
}
}

O/p-- Salary is going to increment by 30%.
Suppose we wish to access the Hello() function, then we
can't access the a.Hello();--it gives error.
b'coz Hr doesn't contain a
definition of Hello.

Answer / ashwani kumar

Interfaces are used to decouple the application means our
implementation and defination are diffrent so any change in
one layer dn't affect other
and
if we want to follow some designing pattern then we use
interface.

Answer / kinge amol

if any future implimentation required so not implimentation
on class but is impliments in interface and inherites
interface form class

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