Such classes are known as local classes because (as with local variables ... passing anonymous class-based functionality can lead to verbose syntax. Starting with Java 8, you can use lambdas ...

In Java Futures ... accessible through the variable v because it is not a member of Runnable. But with an inferred type, we are able to infer the sharper type of the anonymous class creation ...

Before Java SE 8, anonymous classes were typically used to pass ... You’ll also learn how lambdas interact with scopes, local variables, the this and super keywords, and Java exceptions.

And because lambda expressions can be assigned to a variable, they provide an opportunity for reuse that simply isn’t possible with anonymous inner classes. It took a long time for lambda expression ...