Neil Morris <firstname.lastname@example.org> writes:
>How can I stop a subtype from being passed to the 'add'
When a method has a parameter of type T, then an
expression of type U is acceptable as the corresponding
argument expression, whenever U is a subtype of T.
This cannot be changed.
To accept only expressions of type T as argument
expressions, T must be final.
To accept only objects of type T as argument values,
the parameter value must be checked using ».getClass«.
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