What is the difference between intermediate and final methods in programming?

An intermediate method is usually used within a class or module to perform auxiliary operations and is not intended for direct external invocation. A final method is a method that cannot be overridden in derived classes, ensuring its behavior remains unchanged.

For example, in Java:

class Base {
    final void finalMethod() {
        System.out.println("This is a final method");
    }
    void intermediateMethod() {
        System.out.println("This is an intermediate method");
    }
}

class Derived extends Base {
    // Error: cannot override finalMethod
    // void finalMethod() {}

    @Override
    void intermediateMethod() {
        System.out.println("Overridden intermediate method");
    }
}

Thus, intermediate methods are flexible and can be changed, while final methods are fixed.