Do I need to use <> empty angle brackets for generics?

Asked Apr 25 '19 at 10:17

Active Apr 25 '19 at 10:17

Viewed 28 times

I've seen the following code, used for pagination of SQL results:

Page<EmployeeEvent> employeeEventPage = new PageImpl<>(employeeEvents, null, 10);

Why do we need to use the "<>" in this context, giving we're talking Java 8? Is that not the same as

Page<EmployeeEvent> employeeEventPage = new PageImpl(employeeEvents, null, 10);

Page is defined as follows:

public interface Page<T> extends Slice<T>

asked Apr 25 '19 at 10:17

Nestor Milyaev

*" Is that not the same as..."* Correct, it is *not* the same. – T.J. Crowder Apr 25 '19 at 10:19
Do you *need* to? No. It's just convenient not to repeat yourself by writing `Page employeeEventPage = new PageImpl(employeeEvents, null, 10);` – Andy Turner Apr 25 '19 at 10:19
@T.J.Crowder I'd add why it's not the same: omitting the `<>` (with or without anything between them) means the expression is a [*raw type*](https://stackoverflow.com/q/2770321/3788176). – Andy Turner Apr 25 '19 at 10:19
@AndyTurner - Well, it's covered by the dupetarget, so... :-) – T.J. Crowder Apr 25 '19 at 10:25

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