How do you override super class?
The ability of a subclass to override a method allows a class to inherit from a superclass whose behavior is “close enough” and then to modify behavior as needed. The overriding method has the same name, number and type of parameters, and return type as the method that it overrides.
Is override required?
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.
Do you need @override to override?
Without it, you can change a method signature and forget to alter its overrides, with @Override, the compiler will catch it for you.
What are the rules of overriding?
Overriding Method must have the same return type (or subtype) From Java 5.0 onwards, it is possible to have a different return type for an overridden method in the child class provided that the return type of child class be the same as a subtype of the overridden method’s return type of the base class.
What are the basic principles to override a method?
12 Rules of Overriding in Java You Should Know
- Rule #1:Only inherited methods can be overridden.
- Rule #2:Final and static methods cannot be overridden.
- Rule #3: The overriding method must have same argument list.
- Rule #4: The overriding method must have same return type (or subtype).
Does @override do anything?
The @Override annotation is one of a default Java annotation and it can be introduced in Java 1.5 Version. It extracts a warning from the compiler if the annotated method doesn’t actually override anything. It can improve the readability of the source code.
Why is overriding necessary?
The benefit of overriding is: ability to define a behavior that’s specific to the subclass type, which means a subclass can implement a parent class method based on its requirement. In object-oriented terms, overriding means to override the functionality of an existing method.
When should you override?
You should always use @Override annotation whenever application, suggested by Google’s Java best practice guide as well. @Override is legal in the following cases : When a class method is overriding a super-class method. When a class method is implementing an interface method.
What is super keyword 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 method.
Can we overload the super class method in sub class?
Yes it is overloading , This overloading is happening in case of the class ‘ C ‘ which is extending P and hence having two methods with the same nam e but different parameters leading to overloading of method hello() in Class C .
What are the mandatory conditions for overriding a method?
With respect to the method it overrides, the overriding method must follow following mandatory rules:
- It must have the same method name.
- It must have the same arguments.
- It must have the same return type.
- It must not have a more restrictive access modifier (if parent –> protected then child –> private is not allowed).
