How do you declare an inner class anonymously in Java?

Java anonymous inner class example using interface

In Java, a class can contain another class known as nested class. It’s possible to create a nested class without giving any name. A nested class that doesn’t have any name is known as an anonymous class. An anonymous class must be defined inside another class. Hence, it is also known as an anonymous inner class.

An anonymous inner class can be useful when making an instance of an object with certain “extras” such as overriding methods of a class or interface, without having to actually subclass a class . Tip: Anonymous inner classes are useful in writing implementation classes for listener interfaces in graphics programming.15 Ara 2021

Anonymous classes enable you to make your code more concise . They enable you to declare and instantiate a class at the same time. They are like local classes except that they do not have a name. Use them if you need to use a local class only once.