What is the concept of overriding?
to prevail or have dominance over; have final authority or say over; overrule: to override one’s advisers. to disregard, set aside, or nullify; countermand: to override the board’s veto. to take precedence over; preempt or supersede: to override any other considerations. to extend beyond or spread over; overlap.
What is overriding annotation in Java?
@Override @Override annotation informs the compiler that the element is meant to override an element declared in a superclass. … If a method marked with @Override fails to correctly override a method in one of its superclasses, the compiler generates an error.
Why do we use overriding?
Method Overriding is a feature that allows us to redefine the method in the subclass or derived class which is already defined in its parent class or superclass. In any object-oriented programming language, we can implement Method Overriding only when two classes have ‘Is-a’ relationship of inheritance between them.
What is overriding and overloading?
Overloading occurs when two or more methods in one class have the same method name but different parameters. Overriding occurs when two methods have the same method name and parameters.
What is polymorphism Java?
Polymorphism in Java is the ability of an object to take many forms. To simply put, polymorphism in java allows us to perform the same action in many different ways. … In the technical world, polymorphism in java allows one to do multiple implementations by defining one interface.
What is difference between method overriding and overloading?
In the method overloading, methods or functions must have the same name and different signatures. Whereas in the method overriding, methods or functions must have the same name and same signatures. … Whereas method overriding is done between parent class and child class methods.
What is super () in Java?
The super keyword in Java is a reference variable which is used to refer immediate parent class object. Whenever you create the instance of subclass, an instance of parent class is created implicitly which is referred by super reference variable. … super() can be used to invoke immediate parent class constructor.
Is @override needed?
The @Override annotation informs the compiler that the element is meant to override an element declared in a superclass. It is not required, but it will generate a compile error if that method actually does not correctly override a method in a superclass.
What is use of @transactional?
The @Transactional annotation makes use of the attributes rollbackFor or rollbackForClassName to rollback the transactions, and the attributes noRollbackFor or noRollbackForClassName to avoid rollback on listed exceptions. The default rollback behavior in the declarative approach will rollback on runtime exceptions.