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Explanation

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

Code:

final int x = 10;

Explanation

A final variable cannot be reassigned once it is initialized.

Code:

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

Explanation

A final method cannot be overridden by a subclass.

Code:

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:

final class Animal {
}

// class Dog extends Animal {} // Error