Implement interface

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Tony Johansson - 29 May 2005 20:22 GMT

Hello!

When a class implaments an Interface must the class implement all methods?
Whan happen if the class don't implament all methods in the interface. Will
it cause compile error then.

//Tony

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Murray - 30 May 2005 10:55 GMT

> Hello!
>
[quoted text clipped - 3 lines]
>
> //Tony

Why don't you try it and find out yourself?

A class must implement all methods of the interface, unless the class is
declared as abstract.

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James McIninch - 09 Jun 2005 11:56 GMT

> Hello!
>
> When a class implaments an Interface must the class implement all methods?

Yes, that's the idea.

> Whan happen if the class don't implament all methods in the interface.
> Will it cause compile error then.

It doesn't compile.

> //Tony

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Gordon Beaton - 09 Jun 2005 15:30 GMT

> When a class implaments an Interface must the class implement all
> methods? Whan happen if the class don't implament all methods in the
> interface.

You have two choices:

- implement every method required by the interface

or

- declare the missing methods abstract in your class. This forces you
to declare your class abstract and, as a result, forces you to
subclass the class (and implement the missing methods) before you
can create any objects.

> Will it cause compile error then.

Otherwise, yes.

/gordon

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Implement interface

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