core classes still need to be declared final?
nradov at axolotl.com
Mon Jan 7 13:31:58 PST 2008
Is it still necessary for the core Java classes such as java.lang.Integer
to be declared final? I understand that may have been necessary in the
early days for performance reasons, but modern JVMs no longer provide much
of a performance benefit for final classes. For certain applications it
would really be helpful to be able to subclass some of those core classes.
For example, one application I'm working on deals with integer values that
must be between 0 and 9999 inclusive. I would like to be able to create a
custom Integer subclass which enforces that limit in the constructor, but
currently that isn't possible. While I could create a new class that acts
as a wrapper around Integer, the syntax would be much more awkward and
that would also make it much more difficult to interface with other
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