Java Anonymous inner class

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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.

In simple words, a class that has no name is known as an anonymous inner class in Java. It should be used if you have to override a method of class or interface. Java Anonymous inner class can be created in two ways:

  1. Class (may be abstract or concrete).
  2. Interface

参考：https://www.javatpoint.com/anonymous-inner-class