Is the note for 'Method Overriding in Java' free to read?

Yes, NotesMedia provides free access to 'Method Overriding in Java' notes for BCA / B.Tech preparation online.

Does this cover the syllabus for Java Notes in English?

Yes, this chapter covers key concepts of 'Method Overriding in Java' under the Java Notes in English syllabus for BCA / B.Tech.

How long does it take to read 'Method Overriding in Java'?

This note is approximately a 10-minute read.

Method Overriding in Java - (BCA / B.Tech)

What is Method Overriding in Java?

Method overriding occurs when a subclass (child class) has a method with the same name, parameters, and return type as a method in its superclass (parent class). By overriding, the subclass provides its own specific implementation of that method, replacing the behavior inherited from the parent. This is a fundamental concept for achieving run-time polymorphism (or dynamic binding).

Rules for Method Overriding:

The method name, parameter list, and return type must be exactly the same (or a covariant return type for objects).
The method must be inherited. Therefore, there must be an IS-A (inheritance) relationship between the classes.
The access modifier of the overriding method in the subclass cannot be more restrictive than the overridden method in the superclass (e.g., you cannot override a `public` method with a `private` one).
You cannot override `final` or `static` methods.

Example of Method Overriding:

The @Override annotation is not mandatory, but it is highly recommended. It tells the compiler you intend to override a method, and the compiler will produce an error if you fail to do so correctly (e.g., due to a typo in the method name).


// Superclass
class Vehicle {
    void run() {
        System.out.println("Vehicle is moving");
    }
}

// Subclass
class Bicycle extends Vehicle {
    // Overriding the run method of the Vehicle class
    @Override
    void run() {
        System.out.println("Bicycle is moving safely on two wheels");
    }
}

public class Main {
    public static void main(String[] args) {
        Vehicle myVehicle = new Bicycle(); // A Vehicle reference pointing to a Bicycle object
        myVehicle.run(); // At runtime, Java calls the overridden method from the Bicycle class.
    }
}

Output:

Bicycle is moving safely on two wheels

Method Overriding in Java

What is Method Overriding in Java?

In this Chapter