Overriding 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-classess or parent classess.

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 override the method in the super-class.

// Base Class
class Parent
{
    void show() { System.out.println("Parent's show()"); }
}

// Inherited class
class Child extends Parent
{
    // This method overrides show() of Parent
    @Override
    void show() { System.out.println("Child's show()"); }
}

// 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();
        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();
    }
}