generics - difference b/w <? extends A> and <T extends A>??

[Aakash Goel]

What is the difference between saying

1) <? extends A> and
2) <T extends A>? (where A is some class)

1 means 'anything' that extends A

2 means 'T' where 'T' extends A

Both sound the same! What is the difference?

[Henry Wong]

Both sound the same! What is the difference?

We need some context. Show us some compilable code.

Henry

[Aakash Goel]

Henry Wong wrote:

Both sound the same! What is the difference?

We need some context. Show us some compilable code.

Henry

I dont know. I am confused. I was just referring to the general meaning of these statements.

[Henry Wong]

Aakash Goel wrote:I dont know. I am confused. I was just referring to the general meaning of these statements.

Both cases have different uses... so it is difficult to compare the "general meaning". The second case is use to bound a Type when you declare a type T (as either a class type or a method type). The first case is a bounded wildcard, which can be used when declaring a generic typed class. Of course, this can get complicated, which is why we need context...

Henry