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Displaying Source Code(s)
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Is it possible to stop an object from being created during
construction?
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Yes, have the constructor throw an exception. Formally, an
object _will_ be created (since the constructor is a method
invoked after the actual method creation), but nothing useful
will be returned to the program, and the dead object will be
later reclaimed by Garbage Collector.
But the clean way is that you leave calls to the constructor to
a static factory method which can check the parameters and
return null when needed.
Note that a constructor - or any method in general - throwing an
exception will not "return null", but will leave the "assign
target" as it was.
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