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Feb 1, 2019 · You cannot create an object of abstract class or interface since they are incomplete class (interface is not even considered as a class.) What you can do is to implement a subclass of abstract class which, of course, must not be abstract.
The IA class instantiates an object of the I abstract class and implements the next method that was missing from the I class. You are actually creating an object of an anonymous that implements the implied abstract method.
Oct 10, 2024 · Abstract Class: An abstract class is a type of class in Java that is declared by the abstract keyword. An abstract class cannot be instantiated directly, i.e. the object of such class cannot be created directly using the new keyword.
Aug 29, 2021 · The main purpose of the constructor is to initialize the newly created object. In abstract class, we have an instance variable, abstract methods, and non-abstract methods. We need to initialize the non-abstract methods and instance variables, therefore abstract classes have a constructor.
Aug 27, 2024 · Interface vs. Abstract Class. An abstract class is nothing but a class that is declared using the abstract keyword. It also allows us to declare method signatures using the abstract keyword (abstract method) and forces its subclasses to implement all the declared methods.
The abstract keyword is a non-access modifier, used for classes and methods: Abstract class: is a restricted class that cannot be used to create objects (to access it, it must be inherited from another class). Abstract method: can only be used in an abstract class, and it does not have a body.
If your abstract class don’t contain any abstract method, you can not create instance of it. By making a class abstract, you told compiler that, it’s incomplete and should not be instantiated. Java compiler will throw error, when a code tries to instantiate abstract class.
