In which cases is it advisable to use the final modifier in programming?

The final modifier in Java is used to restrict inheritance and overriding:

• final class cannot be inherited. It is used when you want to prevent class extension (for example, for security or to maintain immutable behavior).
• final method cannot be overridden in subclasses. This guarantees that the method's implementation remains unchanged.
• final variable — its value cannot be changed after initialization, which is useful for constants and ensuring immutability.

Example:

final class Constants {
    public static final double PI = 3.1415;
}

class Base {
    public final void show() {
        System.out.println("Base show");
    }
}

class Derived extends Base {
    // Error: cannot override final method
    // public void show() { }
}

Using final helps improve code safety and prevents unintended modifications.