A class that have no name is known as anonymous inner class in java. It should be used if you have to override method of class or interface. Java Anonymous inner class can be created by two ways: Class (may be abstract or concrete). Anonyme Klassen sind namenlose Klassen, die gleichzeitig definiert und initialisiert werden. Sie werden mit dem new -Operator an der Stelle im Quelltext initialisiert, an der sie Verwendung finden. Somit stehen sie für gewöhnlich selbst an Stellen, an denen sonst ein Referenzwert erwartet würde. An anonymous class has access to the members of its enclosing class. An anonymous class cannot access local variables in its enclosing scope that are not declared as final or effectively final. Like a nested class, a declaration of a type (such as a variable) in an anonymous class shadows any other declarations in the enclosing scope that have the same name. See Shadowing for more information. class Aggregate implements A, B { void foo() {} void bar() {} } I then use Aggregate where ever I would have used the anonymous class. I was wondering if it is even legal for an anonymous class to implement two interfaces. Anonymous Class Declaration Anonymous classes are inner classes with no name. Since they have no name, we can't use them in order to create instances of anonymous classes. As a result, we have to declare and instantiate anonymous classes in a single expression at the point of use. Anonymous class is an inner class without a name, which means that we can declare and instantiate class at the same time. A lambda expression is a short form for writing an anonymous class. By using a lambda expression, we can declare methods without any name. Anonymous class vs Lambda Expression Here we present an example and a short tutorial on anonymous classes in Java. Anonymous classes in Java are more accurately known as anonymous inner classes – there’s no such thing as anonymous classes without the “inner”. That distinction is important, because the fact that they are anonymous inner classes means that they are defined inside another class. What’s meant by anonymous class in Java? An anonymous class in Java is a class not given a name and is both declared and instantiated in a single statement. An anonymous class is commonly used in the Java platform where a function language would use a lambda expression. It 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. Anonymous Class in Java What is Anonymous Class in Java? It is defining a class with no identity i.e. a class without a name. They are used whenever you need to override the methods of a class, abstract class or interface.
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