What is an anonymous inner class?

Since anonymous inner class has no name, an anonymous inner class cannot have an explicit constructor in Java .

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.

Explanation: Anonymous inner classes are the same as the local classes except that they don’t have any name . The main use of it is to override methods of classes or interfaces.

You can’t declare a constructor for an anonymous class , because the name for a constructor must be the same as the name of the class. And since the class in question has no name, you can’t declare a constructor for the class.

Java anonymous inner class is an inner class without a name and for which only a single object is created . An anonymous inner class can be useful when making an instance of an object with certain “extras” such as overloading methods of a class or interface, without having to actually subclass a class.