Why duplicate interface implements
[199 byte] By [SeaRinga] at [2007-11-27 6:41:56] 
In the Java API source code, for example, java.util.HashMap extends AbstractMap and implements Map while the former already implements the latter. What could be the reason for this redundancy?
It's a style thing basically. It doesn't make any difference and you can argue it makes it easier to look at the code.
YoGeea at 2007-7-12 18:11:52 >
that's probably the reason, documentation.
It's also more futureproof, as it allows the definition of AbstractMap to at some point change to one that doesn't implement Map without if affecting the interface of HashMap (potentially of course, method signatures would have to be preserved).
jwentinga at 2007-7-12 18:11:52 >
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