The protected access modifier is accessible within the package. However, it can also accessible outside the package but through inheritance only. We can’t assign protected to outer class and interface. If you make any constructor protected, you cannot create the instance of that class from outside the package.
Can a protected field of a class be inherited to subclass outside the package?
We cannot access the protected members of a class in a class (non-subclass) that is present in a different package.
Can protected members of a class be inherited?
With protected , all public members of the base class are inherited as protected in the derived class. Conversely, if the most restricting access level is specified ( private ), all the base class members are inherited as private .
Can protected members be inherited in Java?
Methods declared protected in a superclass must either be protected or public in subclasses; they cannot be private. Methods declared private are not inherited at all, so there is no rule for them.
Can we inherit protected method?
Yes, the protected method of a superclass can be overridden by a subclass.
Can a protected field of a class be inherited to subclass outside the package Mcq?
10) Can a protected field of a class be inherited to subclass outside the package? Answer : Yes, protected members of a class are inherited to sub classes outside the package.
Can protected members be accessed by objects?
Protected members in a class are similar to private members as they cannot be accessed from outside the class. But they can be accessed by derived classes or child classes while private members cannot.
What happens when a protected member is inherited as public?
public inheritance makes public members of the base class public in the derived class, and the protected members of the base class remain protected in the derived class. protected inheritance makes the public and protected members of the base class protected in the derived class.
What happens when a protected member is inherited in private and public mode?
When a base class is inherited with public visibility mode , the protected members of the base class will be inherited as protected members of the derived class and the public members of the base class will be inherited as public members of the derived class.
Is protected package private?
The private modifier specifies that the member can only be accessed in its own class. The protected modifier specifies that the member can only be accessed within its own package (as with package-private) and, in addition, by a subclass of its class in another package.
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.
How are protected members of a base class?
If a class is derived privately from a base class, all protected base class members become private members of the derived class. Class A contains one protected data member, an integer i . Because B derives from A , the members of B have access to the protected member of A .
What is difference between private public and protected?
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.
How do you access protected methods outside a class?
The protected access modifier is accessible within the package. However, it can also accessible outside the package but through inheritance only. We can’t assign protected to outer class and interface. If you make any constructor protected, you cannot create the instance of that class from outside the package.
Which public member of a base class Cannot be inherited?
Q) Which public member of a base class cannot be inherited? In C++ constructor and destructor both cannot be inherited to child class.
What is the difference between public/private and protected derivation?
1) Public Inheritance:
Private members of Base class are not accessible in Derived class. b. Protected members of Base class remain protected in Derived class. c.
When a class is inherited publicly?
Public Inheritance − When deriving a class from a public base class, public members of the base class become public members of the derived class and protected members of the base class become protected members of the derived class.
When inheritance is private the private members are?
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.
When a protected member of the base class is inherited what will be the access modifier of that member in the derived class?
That is, our derived class publicly inherits the base class. In this lesson, we’ll take a closer look at public inheritance, as well as the two other kinds of inheritance (private and protected).
17.5 — Inheritance and access specifiers.
| Access specifier in base class | Access specifier when inherited protectedly |
|---|---|
| Protected | Protected |
| Private | Inaccessible |
Can we override constructor?
Constructor looks like method but it is not. It does not have a return type and its name is same as the class name. But, a constructor cannot be overridden. If you try to write a super class’s constructor in the sub class compiler treats it as a method and expects a return type and generates a compile time error.
What is the difference between private public and protected members accessors and modifiers?
Explanations. A private member ( i ) is only accessible within the same class as it is declared. A member with no access modifier ( j ) is only accessible within classes in the same package. A protected member ( k ) is accessible within all classes in the same package and within subclasses in other packages.
What’s the difference between a protected method and a private method?
Protected methods are a balance between public and private methods. They are similar to private methods in that they cannot be accessed in the public scope. Neither the client nor the program can invoke them. However, objects of the same class can access each other’s protected methods.
Can a private method be overridden?
No, we cannot override private or static methods in Java. Private methods in Java are not visible to any other class which limits their scope to the class in which they are declared.
Can we declare abstract method as private?
If a method of a class is private, you cannot access it outside the current class, not even from the child classes of it. But, incase of an abstract method, you cannot use it from the same class, you need to override it from subclass and use. Therefore, the abstract method cannot be private.
Why constructors are always public?
You make a constructor public if you want the class to be instantiated from any where. You make a constructor protected if you want the class to be inherited and its inherited classes be instantiated.
How do I override a protected constructor in Java?
Protecting a constructor prevents the users from creating the instance of the class, outside the package. During overriding, when a variable or method is protected, it can be overridden to other subclass using either a public or protected modifier only. Outer class and interface cannot be protected.
Can an abstract class be a subclass?
Abstract classes cannot be instantiated, but they can be subclassed. When an abstract class is subclassed, the subclass usually provides implementations for all of the abstract methods in its parent class. However, if it does not, then the subclass must also be declared abstract .
Are static members inherited to subclasses?
In essence, static members are not inherited, they are just class-level (i.e. universal) methods that are accessible from anywhere.
Why is base constructor called first?
A technical reason for this construction order is that compilers typically initialize the data needed for polymorphism (vtable pointers) in constructors. So first a base class constructor initializes this for its class, then the derived class constructor overwrites this data for the derived class.
What can be inherited from base class?
Inheritance enables you to create new classes that reuse, extend, and modify the behavior defined in other classes. The class whose members are inherited is called the base class, and the class that inherits those members is called the derived class. A derived class can have only one direct base class.
What is the difference between a private member and a protected member?
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. You will learn more about Inheritance later.
Can inherited class access private members?
Private members of the base class cannot be used by the derived class unless friend declarations within the base class explicitly grant access to them. In the following example, class D is derived publicly from class B . Class B is declared a public base class by this declaration.
Can virtual function be inherited?
Base classes can’t inherit what the child has (such as a new function or variable). Virtual functions are simply functions that can be overridden by the child class if the that child class changes the implementation of the virtual function so that the base virtual function isn’t called. A is the base class for B,C,D.
What is not inherited by a child class?
Constructors, static initializers, and instance initializers are not members and therefore are not inherited.
Can protected methods be inherited in Java?
Yes, the protected method of a superclass can be overridden by a subclass.
Do child classes inherit protected members?
Therefore, by using protected, you can create class members that are private to their class, but that can still be inherited and accessed by a derived class.
Can you inherit multiple interfaces?
No you cannot inherit multiple interfaces, because interfaces cannot be inherited. Interfaces are IMPLEMENTED, not inherited.
Can final method be inherited?
Ans) Yes, final method is inherited but you cannot override it. For Example: class Bike{ final void run(){System.
Which of the following is false about protected class members?
13. Which of the following is false about protected class members? Explanation: Protected class members can’t be accessed by name mangling.
Is protected better than private?
Only the member functions or the friend functions are allowed to access the private data members of a 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. Private member are not inherited in class.
Which public member of a base class Cannot be inherited?
Q) Which public member of a base class cannot be inherited? In C++ constructor and destructor both cannot be inherited to child class.
How are protected members of a base class?
If a class is derived privately from a base class, all protected base class members become private members of the derived class. Class A contains one protected data member, an integer i . Because B derives from A , the members of B have access to the protected member of A .
When inheritance is private the private members are?
Explanation: When the inheritance is private, the private methods in base class are inaccessible in the derived class (in C++). 2.
Why do we use protected specifier for base class data members in inheritance?
When dealing with inherited classes, things get a bit more complex. C++ has a third access specifier that we have yet to talk about because it’s only useful in an inheritance context. The protected access specifier allows the class the member belongs to, friends, and derived classes to access the member.
When inheritance is protected private members of base class are in the Derivedclass?
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. However, they can be used inside the member functions of the derived class.