abstract interface, why to specify abstract (an interface is abstract !!)?

"All methods of an interface are implicitly abstract, even if the abstract modifier is omitted." Java in a Nutshell

So, it is not necessary, and does not mean anything to an interface.

Hi Webski

U can create an instance for an Interface that is quite possible. But for a abstract interface u cann't. That is why some interface cann't have instance that is why to avoid them there use abstract before it.


Cheers
Shyam

Hi Shyam,
How can you create an instance of an interface, when you only have the signatures of the methods in it?
It is not possible... Is it?

You're right, webaski, you cannot create an instance of an interface in the same way you create an instance of a class. For example, the following will not work:

    Serializable x = new Serializable();

Being _inherently_ abstract, you cannot directly create instances of an interface, just as you cannot construct instances of an abstract class. But you might, through an anonymous inner class, declare a class that implements the interface, define that class's implementation, and construct an object of the new class.

    Serializable x = new Serializable() { };

This _looks_ a lot like creating an instance of an interface but is _completely_ different.

Best regards,
Jim Cakalic

Well, it works because there is no method in the Serializable interface... Try with WindowListener for example, it won't compile.

WindowListener x = new WindowListener() { };

webaski:
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Recommendation: points to jim_cakalic

No comment has been added lately, so it's time to clean up this TA.
I will leave a recommendation in the Cleanup topic area that this question is:


[points to jim_cakalic]


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