Proper polymorphic syntax...

[Janeice DelVecchio]

I would like to call the overridden toString() method in the subclasses of Student instead of the Student.toString(). I have an ArrayList of <? extends Student>.

for (<? extends Student> s : studentList) {
			System.out.println(s.toString);
		}    

I haven't been able to try it because right now I'm fighting with the database that the application ties into.... My gut says it will work, but it looks funny.

I guess really the ultimate question is..... can I use that <? extends whatever> ANYWHERE I would declare what goes into or out of something??

[John de Michele]

Janeice:

Actually, you shouldn't need to call toString() directly at all. The println() method already calls toString() for arbitrary classes.

John.

[Janeice DelVecchio]

Thanks, John.

So I don't need to specify the toString()....

But the <? extends Student> will make sure the subclasses' toString() method is accessed?

[Henry Wong]

Janeice DelVecchio wrote:
I guess really the ultimate question is..... can I use that <? extends whatever> ANYWHERE I would declare what goes into or out of something??

No. Wildcards, bounded or otherwise, are only used for generics. You can't actually declare such a variable.

Henry

[Janeice DelVecchio]

Thanks Henry!