Contents
Which is an abstract class having no implementation?
An abstract method has no implementation. It just has a method signature. Just like methods in a Java interface. If a class has an abstract method, the whole class must be declared abstract.
Can we have abstract class without having any abstract method in it?
yes, we can declare an abstract class without any abstract method. the purpose of declaring a class as abstract is not to instantiate the class.
Why abstract class has no abstract method?
Abstract class without abstract method means you can create object of that abstract class. See my Example. If you write one abstract method inside abstract class then it will not compile. Which means if you create abstract class without abstract method then you can create Object of that Abstract Class.
How is an abstract method implemented in a non abstract class?
Abstract Method: A method which is declared abstract, has no “body” and declared inside the abstract class only. An abstract method must be implemented in all non-abstract classes using the override keyword. After overriding the abstract method is in the non-Abstract class.
How is an abstract class declared in Java?
Abstract class in Java. A class which is declared as abstract is known as an abstract class. It can have abstract and non-abstract methods. It needs to be extended and its method implemented. It cannot be instantiated. An abstract class must be declared with an abstract keyword.
How to create an abstract class in C #?
public abstract void geek (); // the method ‘geek ()’ is abstract Abstract Class: This is the way to achieve the abstraction in C#. An Abstract class is never intended to be instantiated directly. This class must contain at least one abstract method, which is marked by the keyword or modifier abstract in the class definition.
How are abstract classes similar to an interface?
Abstract classes are similar to interfaces. You cannot instantiate them, and they may contain a mix of methods declared with or without an implementation. However, with abstract classes, you can declare fields that are not static and final, and define public, protected, and private concrete methods.