Use it when you need to do some internal stuff that is not exposed in public API but still needs to be overriden by subclasses. You need to use the protected access modifier, when you want the descendant class to see the fields / methods of the super class, BUT you do not want other classes to see these.
Why do we need to use protected access modifier instead of private?
Access modifiers do not prevent inheritance. Instead, access modifiers affect what you can and cannot see in the subclass. Those private members and attributes are still in your subclasses. … Protected access hides the class’s methods and attributes from classes that exist outside of the class’s package.
What is the use of protected access?
The protected keyword specifies access to class members in the member-list up to the next access specifier ( public or private ) or the end of the class definition. Class members declared as protected can be used only by the following: Member functions of the class that originally declared these members.
Why do we use protected?
So if we want data members to be accessible to only derived classes and not privately or publicly accessible, then we can use protected. – Protected is similar to private. – It makes class member inaccessible outside the class, but the members can be accessed by any subclass of that class.
Why we use protected private and public access specifiers?
Access specifiers define how the members (attributes and methods) of a class can be accessed. … private – members cannot be accessed (or viewed) from outside the class. protected – members cannot be accessed from outside the class, however, they can be accessed in inherited classes.
What is the difference between protected and private?
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 the difference between private members and protected members?
Private members are accessible within the same class in which they are declared. Protected members are accessible within the same class and within the derived/sub/child class. Private members can also be accessed through the friend function. Protected members cannot be accessed through the friend function.
What is access specifier What is its role?
Access modifiers (or access specifiers) are keywords in object-oriented languages that set the accessibility of classes, methods, and other members. … When the class is declared as public, it is accessible to other classes defined in the same package as well as those defined in other packages.
How can we access protected and private members of a class?
Protected members can only be accessed by descendants of the class, and by code in the same module. Private members can only be accessed by the class they’re declared in, and by code in the same module.
Can constructor be inherited?
Constructors are not members, so they are not inherited by subclasses, but the constructor of the superclass can be invoked from the subclass.
Should you use protected?
Should you ever use protected member variables? Depends on how picky you are about hiding state. If you don’t want any leaking of internal state, then declaring all your member variables private is the way to go. If you don’t really care that subclasses can access internal state, then protected is good enough.
Can we override protected method as public?
Yes, the protected method of a superclass can be overridden by a subclass. If the superclass method is protected, the subclass overridden method can have protected or public (but not default or private) which means the subclass overridden method can not have a weaker access specifier.
Should you use protected variables?
Protected variables should be avoided because: They tend to lead to YAGNI issues. Unless you have a descendant class that actually does stuff with the protected member, make it private. They tend to lead to LSP issues.