What is the difference between <T> and <T extends Object> in java? [duplicate]

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.

来源：https://stackoverflow.com/questions/30206340/what-is-the-difference-between-t-and-t-extends-object-in-java