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.
Should I use protected Java?
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.
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 modifiers in Java?
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. In this example, we have created the two packages pack and mypack.
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 we override private method in Java?
1) In Java, inner Class is allowed to access private data members of outer class. … 2) In Java, methods declared as private can never be overridden, they are in-fact bounded during compile time.
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.
Can we access protected member outside the package?
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.
Should you use protected variables?
Protected variables should be avoided because: … Protected variables generally have some intrinsic invariance associated with them (or else they’d be public). Inheritors then need to maintain those properties, which people can screw up or willfully violate.
Who can access protected in 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 is modifier in Java?
Access modifiers are object-oriented programming that is used to set the accessibility of classes, constructors, methods, and other members of Java. Using the access modifiers we can set the scope or accessibility of these classes, methods, constructors, and other members.
Can a class be private or protected in Java?
No, we cannot declare a top-level class as private or protected. It can be either public or default (no modifier).