Use of Final Keyword in Java | Final Variable, Method, Class | Example | Object Oriented Programming

In Java, the `final` keyword is a modifier that can be applied to classes, methods, and variables (fields). It serves various purposes, indicating that an entity is not allowed to be further modified or extended:

1. Final Classes:
A class declared as `final` cannot be subclassed or extended. It is considered a complete and immutable class.

Example:

final class MyFinalClass {
// Class members and methods
}


2. Final Methods:
When a method is marked as `final` in a class, it cannot be overridden or modified by any subclass.

Example:

class MyBaseClass {
final void myFinalMethod() {
// Method implementation
}
}


3. Final Variables (Constants):
A `final` variable, often referred to as a constant, cannot be reassigned once it's given a value. It must be initialized when declared or in the constructor.

Example:

final int MY_CONSTANT = 42;


4. Method Parameters:
When a method parameter is marked as `final`, it ensures that the parameter's value cannot be changed within the method.

Example:

void process(final int value) {
// The 'value' parameter cannot be modified within this method.
}


The `final` keyword is used for various purposes in Java, including ensuring immutability, method security, and creating constants. It helps improve code reliability and maintainability by preventing unintended modifications and extensions of classes, methods, and variables.


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