Purpose of interface

The Difference between C#,VB.nET,Java and C++ is that C++ can do multiple inheritance , but java and the .net languages i mentioned here cant do do that. Instead, you need to implement the interfaces.

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Ray.chayan, if this helps please login to Mark As Answer. | Alert Moderator

Yes . But in interface there is only the signature of the method . So why should we implement it?

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Well for small applications there is not need to use them , for more info on your question look at this. Remember the same interfaces in java still applies to .net languages.

Why use interfaces ?

http://www.codestyle.org/java/faq-Interface.shtml#interfacedesign

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Thanks Vuyiswamb, But I am facing some problem to understand the point in the line given bellow.
"To start with, you may only have one implementation of a given interface, but if you find you need slightly different behaviour in special circumstances, you only need write a class that conforms to one of the existing interfaces and it will drop in place without major modifications."
Could you please explain it .........

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Hi,
Check the following Link
http://ondotnet.com/pub/a/dotnet/2003/06/30/interfaces.html

Syed Shakeer Hussain

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Interface defines the contract. If you wish to use it, follow its rules.
There is much debate going on between choosing Interfaces to Abstract classes. where abstract classes are much more flexi than interfaces.

BottomLine, If the requirement never changes in terms of the system design go with Interfaces. If you feel the requirment may change in the future better go with abstract classes.

That was just a very higher level explanation.

Hope that helps!

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Interfaces are used to pass objects that are completely different but who all have some methods that are defined in the interface.

Consider a class Rock and a class House. Completely different, and nothing in common, almost. For instance, they both can drop down and crash, say in case of an earthquake :P. Now, you have a class Earthquake with a SmashObjects method. Instead of having to create a parent class for everything on earth that can drop, and have every class, like Rock and House inherit that class, you can make an interface IDroppable and have Rock and House implement that interface. In the interface you define Drop(); and now SmashObject can smash every object that implements IDroppable because it knows, no matter how different, they all have a Drop method.

interface IDroppable
{
Drop();
}

class House : IDroppable
{
Drop()
{
// do house dropping stuff
}
}
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