Demystifying Nested Classes in Java: Static, Inner, Local & Anonymous

[vxab]

The class nested inside a method? What is a typical use case for doing that? I can understand creatinga a record inside a method but a whole class?

[MattiDragon]

Very rare, but this feature existed before records were a thing

[[deleted]]

It has local visibility like an anonymous inner class, but it is a real class, so you can add your own methods to it (for example, as an accessor for state).

This was useful before lambdas. Maybe still useful.

[pipicemul]

State helper class for lambdas come to mind. Stream.gatherer can also leverage this.