![]() We can then create an object of this anonymous class and call its makeSound() method to print "Woof" to the console.Ĭreating an anonymous class from an abstract class allows us to provide a concrete implementation for its abstract methods without having to define a new class explicitly. We then create an anonymous class from Animal and provide an implementation for its makeSound() method. This class has an abstract method makeSound(). In the above code, we have declared an abstract class named “Animal”. Here is an example of creating an anonymous class from an abstract class in Java. Since an abstract class cannot be instantiated directly, we can create an anonymous class from an abstract class to provide an implementation for its abstract methods. It is typically used to implement an interface or extend a class and override its methods. Anonymous Class in JavaĪn anonymous class in Java is a local class that does not have a name and is created on the fly. ![]() This will print “Drawing Circle” on the output screen. We are then calling the draw() method on the Shape object, which actually invokes the implementation of the draw() method in the Circle class. We have assigned this instance to a variable of the abstract class Shape. In the above code’s main class, we have created an instance of the Circle class, which is a subclass of the Shape abstract class. The following code will show you what happens if we try to create an object of an Abstract Class in Java. The reason is that the abstract class is not fully defined and, hence, cannot be instantiated. If we try to instantiate an object of the abstract class, we will get the compilation error on the output screen. Since an abstract class is incomplete, i.e., it contains abstract methods that do not have an implementation, it cannot be instantiated. An abstract class is used as a blueprint for other classes to extend and implement abstract methods. Whereas normal methods have an implementation. The abstract method in Java is the one that is only declared but does not have any implementation. It can have abstract methods, concrete methods, and instance variables. The class which is defined with the abstract keyword is the Abstract Class in Java. However, you can create an instance of a subclass that extends the abstract class. This means that you cannot create an object of an abstract class directly. In Java, an abstract class is a class that is declared with the abstract keyword which cannot be instantiated.
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