Best Answer · By JanBask Salesforce Expert
Answered on Aug 1, 2020
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 superclasses or parent classes. When a method in a subclass has the same name, same parameters or signature and the same return type(or sub-type) as a method in its super-class, then the method in the sub-class is said to override the method in the super-class. Method overriding is one way to achieve polymorphism.
Example :-
/ Base Class
class testclass {
void show()
{
System.out.println("Testclass show()");
}
}
// Inherited class
class Child extends testclass {
// 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
testclass obj1 = new testclass();
obj1.show();
// If a Parent type reference refers
// to a Child object Child's show()
// is called. This is called RUN TIME
// POLYMORPHISM.
testclass obj2 = new Child();
obj2.show();
}
}
