Java Method overriding | Java Tutorial For Beginners

Java Method 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, same parameters or signature and same return type(or sub-type) as a method in its super-class, then the method in the subclass is said to Java Method overriding the method in the super-class.

Method overriding is one of the way by which java achieve 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.

// Base Class
class Parent
{
}

// Inherited class
class Child extends Parent
{
// This method overrides show() of Parent
@Override
}

// Driver class
class 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();

// 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();
}
}

Output:
Parent's show()
Child's show()

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