Can we access super class version of overridden method in the sub class?
The access specifier for an overriding method can allow more, but not less, access than the overridden method. For example, a protected instance method in the superclass can be made public, but not private, in the subclass.
When one method is overridden in sub class the access specifier of the method in sub class should be equal as method in super class?
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. Method overriding is one of the ways by which java achieve Run Time Polymorphism.
Can I access the subclass method using a superclass object?
Yes its possible to call sub class methods using super class by type casting to sub class object . By type casting super class object to sub class object we can access all corresponding sub class and all super class methods on that reference.
Which method overrides a method in the superclass?
Overriding and Hiding Methods
| Superclass Instance Method | Superclass Static Method | |
|---|---|---|
| Instance Method | Overrides (must also have the same return type) | Generates a compile-time error |
| Static Method | Generates a compile-time error | Hides |
How do I access overridden method?
Invoking overridden method from sub-class : We can call parent class method in overriding method using super keyword. Overriding and constructor : We can not override constructor as parent and child class can never have constructor with same name(Constructor name must always be same as Class name).
Why overridden methods are used in Java?
The purpose of Method Overriding is that if the derived class wants to give its own implementation it can give by overriding the method of the parent class. When we call this overridden method, it will execute the method of the child class, not the parent class.
How can we access an overridden method?
Yes, an overridden method can have a different access modifier but it cannot lower the access scope. Methods declared public in a superclass also must be public in all subclasses. Methods declared protected in a superclass must either be protected or public in subclasses; they cannot be private.
Which of the following methods Cannot be overridden for an object of object class?
Object declares three versions of the wait method, as well as the methods notify , notifyAll and getClass . These methods all are final and cannot be overridden.
Can a superclass access subclass member?
1. Does a superclass have access to the members of a subclass? No, a superclass has no knowledge of its subclasses. Yes, a subclass has access to all nonprivate members of its superclass.
Is a superclass object a subclass object?
A superclass object is a subclass object. The class following the extends keyword in a class declaration is the direct superclass of the class being declared. d. Java uses interfaces to provide the benefits of multiple inheritance.
Which method Cannot be overridden for an object of object class?
What happens when a super class is overridden by a subclass?
If there are methods present in super class, but overridden by subclass, and if object of subclass is created, then whatever reference we use(either subclass or superclass), it will always be the overridden method in subclass that will be executed.
How to access the overridden function of the base class?
To access the overridden function of the base class, we use the scope resolution operator ::. We can also access the overridden function by using a pointer of the base class to point to an object of the derived class and then calling the function from that pointer. Example 2: C++ Access Overridden Function to the Base Class
What is the use of Super() method in function overriding?
super () Method in Function Overridng. super () method in function overriding can be used to call the overridden function in the follwing manner, Notice the changes made to the function bar (). We have added a line that uses super () to call the function foo () defined in its base class. The output is as follows:
How do you refer to a subclass of a superclass?
First approach (Referencing using Superclass reference): A reference variable of a superclass can be used to a refer any subclass object derived from that superclass. If the methods are present in SuperClass, but overridden by SubClass, it will be the overridden method that will be executed.