Classes
Apex Inheritance
Class Inheritance
Apex inheritance uses extends or virtual for polymorphism.
Introduction to Apex Inheritance
Inheritance in Apex allows developers to create a class hierarchy, enabling code reuse and polymorphism. It is a fundamental concept that lets a class derive from another class, inheriting its properties and methods. This is achieved using the extends keyword or by making methods virtual and override.
Using the Extends Keyword
The extends keyword in Apex is used to create a subclass from a parent class. The subclass inherits all accessible methods and properties of the parent class, allowing for method overriding and additional functionality.
Understanding Virtual and Override Keywords
In Apex, methods can be declared as virtual to allow them to be overridden in a subclass. This enables polymorphic behavior, where the method implementation can differ based on the runtime type of the object.
Polymorphism in Action
Polymorphism allows objects to be treated as instances of their parent class, enabling a single interface to represent different underlying forms (data types). This is powerful for designing flexible and scalable code.
Conclusion
Apex inheritance using extends, virtual, and override provides a robust framework for creating reusable and polymorphic code. Understanding these concepts will greatly enhance your ability to design efficient and maintainable programs.
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