Hackforge Academy

Category: React • Beginner

Published on 18 Feb 2026

Explanation

final is a keyword in Java used to restrict modification. It can be applied to variables, methods, and classes.

Code Example

final int x = 10;

Explanation

A final variable cannot be reassigned once it is initialized.

Code Example

final int number = 100;
// number = 200; // Compilation Error

Explanation

A final method cannot be overridden by a subclass.

Code Example

class Parent {
    final void display() {
        System.out.println("Final Method");
    }
}

class Child extends Parent {
    // void display() {} // Error
}

Explanation

A final class cannot be extended by another class.

Code Example

final class Animal {
}

// class Dog extends Animal {} // Error