What do you mean by anonymous inner class in Java?

It can extend exactly one class and implement exactly one interface . It can implement multiple interfaces regardless of whether it also extends a class. It can extend exactly one class or implement exactly one interface.

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.

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.

1 Answer. A local inner class consists of a class declared within a method, whereas an anonymous class is declared when an instance is created . So the anonymous class is created on the fly or during program execution.