abstract classes can contain methods that don’t need to be overridden and methods that need to be overridden because they can contain methods that need to be overridden and they need to be extended to be constructed. useful when you want to share code between several closely related classes that implement a common interface.
What is abstraction in Salesforce?
Data abstraction is a mechanism for retrieving essential details without delving into background details. They are physical plane abstractions. …They are physical level abstraction, conceptual level/view level abstraction and view level abstraction.
What is the difference between virtual class and abstract class?
Virtual methods have an implementation and provide derived classes with the ability to override them. Abstract methods provide no implementation and require derived classes to override the method. Therefore, abstract methods contain no actual code, and subclasses MUST override the method.
What is an abstract class in OOPs with example?
Abstract class is a class type in OOPs that declares one or more abstract methods. These classes can have both abstract and concrete methods. A normal class cannot have abstract methods. An abstract class is a class that contains at least one abstract method.