Re: subclassing and generics

Hendrik Maryns wrote:

I am very surprised nobody gave the advise to not use inheritance at
all.

+1. Including the surprise ;-)

It /might/ be that the OP's uses of FooClass should also "know" that the
objects are Maps (or even TreeMaps), but -- like you -- I doubt it.


Delegation is
the better option, and it also makes the generics issue easier.

Sometimes having a difficulty with generics can indicate a flawed design.
Essentially the Java compiler is telling you "your design sucks" (of course,
/I/ would never be that rude ;-).

Unfortunately, it can be difficult to tell whether a generics problem is
actually caused by iffy design, or whether it's just another flaw in generics
themselves. But they can help diagnose an unclean design, or promote a clean
one.

(There now, I've gone and said something positive about generics! I promise
it won't soon happen again ;-)

-- chris




.

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