Question: What Is Private Protected?

What is the difference between private and protected inheritance?

protected inheritance makes the public and protected members of the base class protected in the derived class.

private inheritance makes the public and protected members of the base class private in the derived class..

What is the main difference between a public method and a private method?

So what’s the difference between a public and private function? A private function can only be used inside of it’s parent function or module. A public function can be used inside or outside of it. Public functions can call private functions inside them, however, since they typically share the same scope.

How do I access a protected method outside the package?

A protected member or constructor of an object may be accessed from outside the package in which it is declared only by code that is responsible for the implementation of that object. new Base(). display(); It creates a Base object, and then trys to call the display() on it.

What is private inheritance?

Private Inheritance is one of the ways of implementing the has-a relationship. With private inheritance, public and protected member of the base class become private members of the derived class. That means the methods of the base class do not become the public interface of the derived object.

Are private functions inherited?

As the private methods are not inherited, a superclass reference calls its own private method. Private methods are only for the owner. … At this point, obj is both things, a Subclass , and a Superclass object. The fact that you use Superclass in the declaration of the variable is just a matter of casting it.

What is the difference between public and private protected areas?

If the class member declared as public then it can be accessed everywhere. If the class members declared as protected then it can be accessed only within the class itself and by inheriting and parent classes. If the class members declared as private then it may only be accessed by the class that defines the member.

Can we declare class as private?

No, we cannot declare a top-level class as private or protected. It can be either public or default (no modifier). If it does not have a modifier, it is supposed to have a default access.

What is difference between private and protected?

The class members declared as private can be accessed only by the functions inside the class. … The class member declared as Protected are inaccessible outside the class but they can be accessed by any subclass(derived class) of that class.

What is public protected and private?

Broadly speaking, public means everyone is allowed to access, private means that only members of the same class are allowed to access, and protected means that members of subclasses are also allowed. However, each language adds its own things to this. For example, C++ allows you to inherit non-publicly.

Is protected package private?

protected : accessible by the classes of the same package and the subclasses residing in any package. default (no modifier specified): accessible by the classes of the same package. private : accessible within the same class only.

What is a protected method?

Protected keyword in Java refers to one of its access modifiers. The methods or data members declared as protected can be accessed from: Within the same class. Subclasses of same packages.

What is public/private protected called?

You must have seen public, private and protected keywords while practising java programs, these are called access modifiers. An access modifier restricts the access of a class, constructor, data member and method in another class.

Why we use public private and protected?

A public member is accessible from anywhere outside the class but within a program. … A protected member variable or function is very similar to a private member but it provided one additional benefit that they can be accessed in child classes which are called derived classes.

Is A or inheritance?

In object-oriented programming, the concept of IS-A is a totally based on Inheritance, which can be of two types Class Inheritance or Interface Inheritance. It is just like saying “A is a B type of thing”. For example, Apple is a Fruit, Car is a Vehicle etc. Inheritance is uni-directional.

How do I access protected members?

Protected members that are also declared as static are accessible to any friend or member function of a derived class. Protected members that are not declared as static are accessible to friends and member functions in a derived class only through a pointer to, reference to, or object of the derived class.