Flutter in Urdu 2024 | Flutter OOP Concepts |
Key OOP Concepts in Flutter
Classes and Objects
Classes are blueprints for creating objects, defining the properties (attributes) and behaviors (methods) of the object.
Objects are instances of classes that represent specific entities, holding the data and functionality defined in the class.
Encapsulation
Encapsulation involves bundling data (variables) and methods (functions) that operate on the data into a single unit (class). It also restricts direct access to some of the object’s components, typically using access modifiers (private, public) to control access. In Dart, prefixing an identifier with an underscore (_) makes it private to its library.
Inheritance
Inheritance allows one class (subclass or child class) to inherit the properties and methods of another class (superclass or parent class). It promotes code reuse and helps with extending functionality. A subclass can override methods of the superclass to provide its own implementation.
Polymorphism
Polymorphism enables one function, method, or object to take multiple forms. In Flutter, this is commonly seen when using method overriding, where a subclass provides a specific implementation for a method defined in its superclass, allowing different behaviors while using the same method name.
Abstraction
Abstraction involves hiding the complexity of the system and exposing only the necessary parts. Abstract classes and methods define behavior without implementing the full functionality, leaving it to subclasses to provide specific details. In Flutter/Dart, abstract classes can be used to enforce a certain structure for subclasses.
Interfaces
Dart doesn’t have a special keyword for interfaces like some other languages. Instead, any class can serve as an interface by implementing its methods. This allows multiple classes to define and use similar behavior without being related through inheritance.