Can abstract classes be protected in Java?
Yes, you can declare an abstract method protected. If you do so you can access it from the classes in the same package or from its subclasses. (Any you must to override an abstract method from the subclass and invoke it.)
What is protected abstract Java?
Abstract is a programming concept to create a pattern for other classes. protected is an access modifier like public and private. protected variables can be accessed from all classes in your package.
Should abstract classes be protected?
An abstract class by definition cannot be instantiated directly. It can only be instantiated by an instance of a derived type. Therefore the only types that should have access to a constructor are its derived types and hence protected makes much more sense than public.
How can we call protected method from abstract class in Java?
2 Answers
- Create a new class that extends that abstract class SingleBrowserLocator (you will have to implement the abstract methods in it);
- Search for a non abstract subclass of SingleBrowserLocator that makes that method public or has other public methods that calls the protected one;
Can we define protected class in Java?
No, we cannot declare a top-level class as private or protected. It can be either public or default (no modifier).
Can abstract class have private variables in Java?
Abstract classes can have private methods. Interfaces can’t. Abstract classes can have instance variables (these are inherited by child classes).
What is a protected method in Java?
Definition and Usage. The protected keyword is an access modifier used for attributes, methods and constructors, making them accessible in the same package and subclasses.
What is a Java abstract class?
An abstract class, in the context of Java, is a superclass that cannot be instantiated and is used to state or define general characteristics. An object cannot be formed from a Java abstract class; trying to instantiate an abstract class only produces a compiler error.
Can abstract classes have private methods?
Abstract classes can have private methods. Interfaces can’t. Abstract classes can have instance variables (these are inherited by child classes). Interfaces can’t.
How do you create a protected class in Java?
No, we cannot declare a top-level class as private or protected. It can be either public or default (no modifier). If it does not have a modifier, it is supposed to have a default access.
Why we use protected method 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.
Why protected is used 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.