Does abstract class can have protected constructor justify?

Yes, an abstract class can have a constructor in Java.

Does abstract class can have protected constructor?

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.

Can abstract classes have constructors justify your answer?

Yes, Abstract Classes can have constructors !

Of Course, abstract class can have a constructor. Generally class constructor is used to initialise fields.So, an abstract class constructor is used to initialise fields of the abstract class.

Can abstract class have protected members?

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.)

Can you have a protected constructor?

A protected constructor means that only derived members can construct instances of the class (and derived instances) using that constructor. This sounds a bit chicken-and-egg, but is sometimes useful when implementing class factories.

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Can abstract class have body?

Abstract methods cannot have body. Abstract class can have static fields and static method, like other classes. … Abstract class cannot have abstract static methods. If a class extends an abstract class, then it should define all the abstract methods (override) of the base abstract class.

Can constructor be static?

Java constructor can not be static

One of the important property of java constructor is that it can not be static. We know static keyword belongs to a class rather than the object of a class. A constructor is called when an object of a class is created, so no use of the static constructor.

Can we make abstract class as final?

No, An abstract class can’t be final because the final and abstract are opposite terms in JAVA. Reason: An abstract class must be inherited by any derived class because a derived class is responsible to provide the implementation of abstract methods of an abstract class.

Can constructor be abstract?

You can’t have an abstract constructor, as abstract means you need to provide the implementation for that at some point of time in your subclass. But you cannot override constructor. There will be no point in having an abstract constructor : Since the constructor needs to be of the same name as of class.

Can an interface have a constructor?

Constructor in an interface

An Interface in Java doesn’t have a constructor because all data members in interfaces are public static final by default, they are constants (assign the values at the time of declaration).

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Can we declare abstract class as public?

Abstract classes are similar to interfaces. You cannot instantiate them, and they may contain a mix of methods declared with or without an implementation. However, with abstract classes, you can declare fields that are not static and final, and define public, protected, and private concrete methods.

Can an abstract class be extended?

An abstract class can extend another abstract class. And any concrete subclasses must ensure that all abstract methods are implemented.

Can an abstract class implement an interface?

Java Abstract class can implement interfaces without even providing the implementation of interface methods. Java Abstract class is used to provide common method implementation to all the subclasses or to provide default implementation. We can run abstract class in java like any other class if it has main() method.