Which overload will get selected for null in Java?

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The most specific method will be called – in this case

showInputDialog(Component parent, Object message)

This generally comes under the “Determine Method Signature” step of overload resolution in the spec (15.12.2), and in particular “Choosing the Most Specific Method”.

Without getting into the details (which you can read just as well in the spec as here), the introduction gives a good summary:

If more than one member method is both
accessible and applicable to a method
invocation, it is necessary to choose
one to provide the descriptor for the
run-time method dispatch. The Java
programming language uses the rule
that the most specific method is
chosen.

The informal intuition is that one
method is more specific than another
if any invocation handled by the first
method could be passed on to the other
one without a compile-time type error.

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