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Talk:Interface (Java)

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This is an old revision of this page, as edited by Doug Bell (talk | contribs) at 06:41, 10 November 2006 (→Interfaces and Abstract Classes: should proofread my post...). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

it is possible to interface implements interface

Interfaces and Abstract Classes

Is it possible for an Interface to implement other interface or extend an abstract class?

No. An interface can extend other interfaces (similar to a class implementing interfaces), but it can't implement other interfaces. Semantically this is because interfaces don't contain an implementation, although syntactically, an interface extending other interfaces is the same as a class implementing interfaces, in that each allows the class/interface to inherit from and assume the types of one or more interfaces. An interface can not extend an abstract class because although the class is declared as abstract, the class can contain an implemention (or partial implementation), and by definition, an interface is not allowed to contain any implementation.
Hope that helps. —Doug Bell talk•contrib 06:38, 10 November 2006 (UTC)[reply]
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