Exploring the Super Keyword and Casting Techniques

Mastering Super keyword, Upcasting and Downcasting 

Everything You Need to Know ☝

Super keyword

The super keyword is used to call the constructor of a superclass from a subclass.  That is, it allows access to the members (methods, fields, constructors) of the parent class from within the subclass. Variables and methods can be called at any time via the super keyword. Unless one explicitly invokes the variables or methods of the super class using the super keyword, then nothing happens.

Uses of super keyword

Casting

The term "casting" is commonly used to describe both implicit and explicit type conversions. Whether it's implicit casting or explicit casting, it's generally referred to as casting.

The term “Type casting” specifically used when referring to casting objects from one class type to another, typically in the context of inheritance and polymorphism. There are two types of objects, parent object and child object.

“Type casting” and “casting” refer to the same fundamental concept of converting values from one data type to another. Upcasting and Downcasting is the type of object typecasting.

Upcasting

The process of assigning an object from the sub class to a variable in the super class reference is called upcasting. The class that creates the object always runs with the object.


Downcasting

Dawncasting means turning the sub class object (subclass constructor) assigned to the variable from the super class reference into a sub class variable again. Dawncasting can only be done by upcasting.

 

Difference between Upcasting and Downcasting💁



Why we need Upcasting and Downcasting ❔

Upcasting📌

👉Upcasting allows for polymorphic behavior , where objects of different subclasses can be treated uniformly through their common superclass interface.

👉 Upcasting enables programmers to focus on the common behavior and attributes of objects, rather than their specific implementations.

 👉By upcasting objects to their superclass types, you can write methods and functions that operate on the superclass, making your code more flexible and adaptable to changes in requirements.

Downcasting📌

👉Accessing Subclass-Specific Behaviour

👉Downcasting is useful when you need to perform operations or manipulations that are specific to a subclass but not applicable to the superclass.

 👉Avoiding Type Errors

Reference-:

https://www.geeksforgeeks.org

Tutorials List - Javatpoint

W3Schools Online Web Tutorials

 

Article by-: Rasanjali Herath
E-Mail-:rasanjaliherath899@gmail.com



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