Inner classes are non-static member classes, local classes, or anonymous classes. In this tutorial you’ll learn how to work with static member classes and the three types of inner classes in ...

For example, in Java, you can define simple interfaces that never truly have a formal implementing class ... The Groovy language does not formally support the creation of anonymous inner classes.

A closure in Groovy is an anonymous chunk of code surrounded by braces that takes zero, one or more arguments, returns a value, and can reference and use variables declared in its surrounding lexical ...