Re: Method chaining with generics


Chris Uppal wrote:
> Raymond DeCampo wrote:
>
> > Is there any case
> > when casting a List to List<Object> would cause a problem?
>
> I haven't been following the thread, so this may be irrelevant. But if you
> start with a List that is intended to hold Strings (whether it's declared as a
> List or a List<String> doesn't matter provided it reaches your code as a List)
> and cast that to a List<Object>, then you'll be able to add a Rectangle to it,
> which would not be correct.

Very true. There are two different cases depending on how the List
started. If it was intended to hold Strings but created as a List, not
a List<String> then the error is at the point of creation. This issue
exists in all java until 5.0. If it was created as a List<String> then
the error is where it was converted to List.

But given a List, which by definition is a list of Objects, is there a
case where casting it to List<Object> is dangerous?

.

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