What is protected and friendly in Java?
Protected variables – Visible only to these classes which they belong, and any subclasses. Friendly variables, the default – Â No modifiers are needed, Visible to the package. Private variables – Visible only to the class to which they belong.
What is friendly access explain with an example?
Friendly access allows you to group related classes together in a package so that they can easily interact with each other. When you put classes together in a package (thus granting mutual access to their friendly members; e.g. making them “friends”) you “own” the code in that package.
What is difference between protected and default?
The protected specifier allows access by all subclasses of the class in question, whatever package they reside in, as well as to other code in the same package. The default specifier allows access by other code in the same package, but not by code that is in subclasses residing in different packages.
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 .
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.
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 we change access modifier overloading method in Java?
you are right brother ,change in access modifier and return type won’t make methods overloaded . The point is that methods that have same name and different signatures(arguments) are said to be overloaded . This is the sufficient condition for making methods overloaded .
What is not type of inheritance?
What is not type of inheritance? Explanation: Inheritance is way of acquiring attributes and methods of parent class. Java supports hierarchical inheritance directly. 2.
What is a constructor and what does it do?
A constructor is a special method of a class or structure in object-oriented programming that initializes a newly created object of that type. Whenever an object is created, the constructor is called automatically.
Is default a protected?
The default modifier is accessible only within package. It cannot be accessed from outside the package. It provides more accessibility than private. But, it is more restrictive than protected, and public.
Can you inherit a final class?
The main purpose of using a class being declared as final is to prevent the class from being subclassed. If a class is marked as final then no class can inherit any feature from the final class. You cannot extend a final 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.