practice final solutions question 6a

[Tina Wang]

Why was {a} added?

[Eric Wohlstadter]

"a" is assigned to the return value of "foo".

Method Summary computes that "foo" may sometimes return null.

Also, using Method Summary it is not possible to distinguish which calls to "foo" are the ones that may return null.

So Method Summary must assume that the first call to "foo" might return null.

Eric

On Wed, Dec 14, 2011 at 3:56 PM, Tina Wang <twan...@gmail.com> wrote:

Why was {a} added?

[stephanie pan]

so if "foo" returns not null, it will force it to return null?
Also, what if the first call to "foo" returns null but the second call
to "foo" doesn't return null, will the result also be forced to be
null?

Thank you