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******************** Class & Object:
→ Blue print - We can relate with our school exam blue print
→ group of similar entities
→ Logical component and not the physical entity
→ Example: Phone is a class, objects are Samsung Galaxy, Vivo V9, iPhone, and etc
→ Class properties can be price, screen size, battery capacity, OS type, and etc.
→ Each object has its own properties
→ iPhone 8 properties are Price=60,000, Battery Capacity=1,821mAh, OS=ios 11
→ Vivo V9 Price= 17,000, Battery capacity=3260 OS=Android 8.1

Inheritance:
→ Inheriting the properties from something
→ OOPS concept in which one object acquires the properties and
→ behaviors of the parent object
→ parent-child relationship between two classes

Inheritance Advantages:
→ Reusability - can reduce duplication of the same code
→ Extensibility - extend the base class logic as per business logic of the derived class
→ Data hiding - base class can decide which properties need to be inherited

Inheritance Real-time Examples:
→ Humans inherit properties from our parents directly and from our grandparents indirectly.

Abstraction:
→ Exposing only the required things to the outside world while hiding the inner details
→ Hiding irrelevant details from the user

Abstraction Advantages:
→ Abstraction makes the code as readable and more simpler. Because the complexity of code will be hidden.
→ It reduces the code because it hides the unnecessary things


Abstraction Real-life Examples:
→ We use Air-conditioner by switching on and off using remote but we don't care about the → → inner working mechanism of Air-Conditioner. We are only concerned about the final output.

Encapsulation:
→ Wrapping up of data and methods into a single unit.
→ To avoid the access of private data members from outside the class.

Encapsulation Advantages:
→ Data Hiding - Restricts the access of some data from outside World directly.
→ Flexibility - Allows whether the data should be read-only or write-read.

Encapsulation Real-life Examples:
→ Consider a Coco-Cola vending machine. Here, both data (coca-cola bottles) and operations → (buyCocoCola()) are wrapped in a vending machine. We can treat that vending machine as a class.

→ You can get a coco cola which is inside the machine only by inserting the coin in the vending machine. Here, Coco-Cola is the private data of that vending machine. You can access that using the operations provided by that Vending machine class.

Polymorphism:
→ Function to take on multiple forms

Polymorphism Types:
→ Method overloading (Compile time polymorphism) - same method name but with different operations.
→ Example: add(int a, int b) add two numbers,
→ add(int a, int b, int c) add three numbers.

→ Method overriding (Run time polymorphism) - If there are 2 classes called Parents and Children.
→ Parents class is a base class and Children is a child class. Children class inherits the Parents class.
→ Both the classes have getPropertyVal method.

Polymorphism Advantages:
→ Single name can be used for the same type of methods


For more details & source code check out: https://programmingline.com/2019/02/c...

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