What is the difference between and in java

问题:

This question already has answers here:

What's the difference between <?> and <? extends Object> in Java Generics? (3 answers)

Closed 5 years ago.

In Java generics, What is the advantage of using class GenericStack<T extends Object> {} over class GenericStack<T>{}.

I have implemented a generic stack using both of the above approaches but unable to trace out the difference. Help me to understand this.

回答1:

There's no difference. <T> and <T extends Object> are equivalent.