Why do some APIs provide mostly interfaces, not classes?

Posted by Lord Torgamus on Stack Overflow See other posts from Stack Overflow or by Lord Torgamus
Published on 2010-04-30T19:12:51Z Indexed on 2010/04/30 19:27 UTC
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Some Java APIs provide a large number of interfaces and few classes. For example, the Stellent/Oracle UCM API is composed of roughly 80% interfaces/20% classes, and many of the classes are just exceptions.

What is the technical reason for preferring interfaces to classes? Is it just an effort to minimize coupling? To improve encapsulation/information hiding? Something else?

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