When should I use protected in Java?
Use the protected modifier when you need to only allow access to the code within the package or when its subclassed.
How do you call a protected method in Java?
If a class is not final, you can use an anonymous class to call its protected method: new ClassWithProtectedMethod() { @Override protected void method() { super. method(); } }. method();
Can we use protected for method in Java?
Variables, methods, and constructors, which are declared protected in a superclass can be accessed only by the subclasses in other package or any class within the package of the protected members’ class. The protected access modifier cannot be applied to class and interfaces.
Why use protected methods 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.
Why use protected methods?
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.
What’s the difference between a protected method and a private method?
Both protected and private methods cannot be called from the outside of the defining class. Protected methods are accessible from the subclass and private methods are not. Private methods of the defining class can be invoked by any instance of that class. Public access is the default one.
What is a protected method?
A protected method is like a private method in that it can only be invoked from within the implementation of a class or its subclasses. It differs from a private method in that it may be explicitly invoked on any instance of the class, and it is not restricted to implicit invocation on self .
What is a protected variable in Java?
In Java, protected means that the member can be accessed by any class in the same package and by subclasses even if they are in another packages. Note A protected variable is not visible outside the package. for example B extends A and A has a protected int x; it can be use within the class B.
Who can access protected in Java?
The protected access modifier is accessible within package and outside the package but through inheritance only. The protected access modifier can be applied on the data member, method and constructor. It can’t be applied on the class. It provides more accessibility than the default modifer.
Can protected methods be overridden?
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.
Is it bad to use protected in Java?
The main reason however that protected variables are not recommended is because they tend to break encapsulation. Variables and methods should have as limited visibility as possible; for further reference see Joshua Bloch’s Effective Java, Item 13 – “Minimize the accessibility of classes and members”.
Who can access protected method Java?
2. The protected Keyword. While elements declared as private can be accessed only by the class in which they’re declared, the protected keyword allows access from sub-classes and members of the same package.
What are protected functions?
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.
What is protected vs private?
private: The type or member can be accessed only by code in the same class or struct . protected: The type or member can be accessed only by code in the same class , or in a class that is derived from that class .
What is the difference between private and protected in Java?
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 you overload an protected method in Java?
Yes, the protected method of a superclass can be overridden by a subclass.
Are protected methods Final?
1) Private methods are final. 2) Protected members are accessible within a package and inherited classes outside the package. 3) Protected methods are final.
Why is protected bad?
Public and/or protected fields are bad because they can be manipulated from outside the declaring class without validation; thus they can be said to break the encapsulation principle of object oriented programming.
When should you 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.
What is protected type in Java?
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. The following table shows the access to members permitted by each modifier.