An anonymous class in Java is a class without a name that is both defined and instantiated in a single expression. Developers commonly use anonymous classes to create instances of classes or implement interfaces without writing a separate named class. This helps in writing cleaner and more concise code, especially for short-term or one-time use cases in Java programming. Characteristics of Anonymous classes Anonymous class is Example: Example without Anonymous class 1. Greeting.java (Interface) 2. GreetingImpl.java (Interface Implementation) 3. DemoTest.java Example: Example with Anonymous class 1. Greeting.java (Greeting Interface) 2. DemoTest.java