Example of Method Overriding in Java
Below is the implementation of the Java Method Overriding:
Java
// Java program to demonstrate// method overriding in java// Base Classclass Parent { void show() { System.out.println("Parent's show()"); }}// Inherited classclass Child extends Parent { // This method overrides show() of Parent @Override void show() { System.out.println("Child's show()"); }}// Driver classclass Main { public static void main(String[] args) { // If a Parent type reference refers // to a Parent object, then Parent's // show is called Parent obj1 = new Parent(); obj1.show(); // If a Parent type reference refers // to a Child object Child's show() // is called. This is called RUN TIME // POLYMORPHISM. Parent obj2 = new Child(); obj2.show(); }} |
Parent's show() Child's show()
Overriding in Java
In Java, Overriding is a feature that allows a subclass or child class to provide a specific implementation of a method that is already provided by one of its super-classes or parent classes. When a method in a subclass has the same name, the same parameters or signature, and the same return type(or sub-type) as a method in its super-class, then the method in the subclass is said to override the method in the super-class.
Method overriding is one of the ways by which Java achieves Run Time Polymorphism. The version of a method that is executed will be determined by the object that is used to invoke it. If an object of a parent class is used to invoke the method, then the version in the parent class will be executed, but if an object of the subclass is used to invoke the method, then the version in the child class will be executed. In other words, it is the type of the object being referred to (not the type of the reference variable) that determines which version of an overridden method will be executed.