What is an anonymous inner class?

What is an anonymous inner 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.

Can an anonymous class implement an interface?

No, anonymous types cannot implement an interface. Anonymous types are class types that consist of one or more public read-only properties. No other kinds of class members such as methods or events are allowed. An anonymous type cannot be cast to any interface or type except for object.

Which is true about an anonymous inner class?

Which is true about an anonymous inner class? It can extend exactly one class and implement exactly one interface. It can extend exactly one class and can implement multiple interfaces. It can implement multiple interfaces regardless of whether it also extends a class.

CAN interfaces contain inner classes?

Yes, you can define a class inside an interface. In general, if the methods of the interface use this class and if we are not using it anywhere else we will declare a class within an interface.

Can an anonymous inner class be declared private?

Restriction on Anonymous Inner class Anonymous inner class cannot be declared as public, private, protected, or static. It cannot access local variables of its enclosing scope that are not declared as final or effectively final.

Can anonymous inner class have constructor?

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

How many objects can an anonymous inner class make?

We cannot create more than one object of the anonymous inner class in Java. Since an anonymous inner class has no name. Therefore, we cannot declare a constructor for it within the class body.

Will an anonymous class be declared as implementing an interface and extending a class?

An anonymous class may implement an interface or extend a superclass, but may not bedeclared to do both.

Can an anonymous class be declared as implementing an interface and extending a class?

What is inner class interface?

An interface which is declared inside another interface or class is called nested interface. They are also known as inner interface. Since nested interface cannot be accessed directly, the main purpose of using them is to resolve the namespace by grouping related interfaces (or related interface and class) together.

Can an anonymous inner class have a constructor Why?

A constructor should have the name same as the class. Since anonymous inner class has no name, an anonymous inner class cannot have an explicit constructor in Java.

What are anonymous classes how are they declared CAN anonymous classes declare variables and methods of its own?

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.