haziramazlan
commented
3 years ago Abstraction:
- A concept aiming to overcome large codebase where objects communicate with each other a lot.
- Each object should only expose a high-level mechanism for using it, in which this mechanism should hide internal implementation details and only reveal operations that are relevant for the other objects.
- It is like a small set of public methods where other class can call without “knowing” how they work.
Inheritance:
- To reuse common variables and extract unique variable into a separate class.
- Form hierarchy by creating parent class and child class.
- Child class can access all private variables and methods from parent class, and can also have their own variables and methods.
Polymorphism:
- Provides a way to use a class exactly like its parent class so there will be no confusion with mixing types.
- A parent class outlines a bunch of common methods, then each child class implements its own version of these methods.
Encapsulation:
- A binding between private state and public methods.
- When each object inside a class keeps its state private, other objects don’t have direct access to this state. Instead, they can only call a list of public methods.
- Other classes cannot use the private objects. They can use the methods provided, but cannot change the state.
References:
Describe each of the below
Abstraction, Inheritance, Polymorphism and Encapsulation.