Can we declare interface as private or protected?

In general, the protected members can be accessed in the same class or, the class inheriting it. But, we do not inherit an interface we will implement it. Therefore, the members of an interface cannot be protected.

Can interface be declared as private?

An interface only can be private if it is a nested interface. A toplevel class or interface either can be public or package-private.

Can we declare interface as protected 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.

Can we use private or protected member variables in an interface?

No, it is not possible to define private and protected modifiers for the members in interfaces in Java. As we know that, the members defined in interfaces are implicitly public or in other words, we can say the member defined in an interface is by default public.

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Can we have protected interface?

Anything that’s protected is an internal detail which does not belong in an interface. You can use abstract classes with protected abstract methods, but interfaces are restricted to public methods and public static final fields.

Can interface be declared as public?

The Interface Body

All abstract, default, and static methods in an interface are implicitly public , so you can omit the public modifier. In addition, an interface can contain constant declarations. All constant values defined in an interface are implicitly public , static , and final .

Why protected is not allowed in interface?

2 Answers. Protected methods are intended for sharing implementation with subclasses. Interfaces have nothing to offer as far as implementation sharing goes, because they have no implementation at all. Therefore all methods on interfaces must be public.

CAN interfaces have protected fields?

Protected fields of an interface

In general, the protected fields can be accessed in the same class or, the class inheriting it. … Therefore, cannot declare the fields of an interface protected. If you try to do so, a compile time error is generated saying “modifier protected not allowed here”.

Can we declare abstract methods as private?

If a method of a class is private, you cannot access it outside the current class, not even from the child classes of it. But, incase of an abstract method, you cannot use it from the same class, you need to override it from subclass and use. Therefore, the abstract method cannot be private.

CAN interface have variables?

An interface can have methods and variables just like the class but the methods declared in interface are by default abstract (only method signature, no body, see: Java abstract method). Also, the variables declared in an interface are public, static & final by default.

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Which member is not allowed in interface?

Private members don’t make sense in interface. Interface is a way to access a class with defined methods where you don’t need to see the inners of that class. Private members disagree to that. Members of a class that are declared private are not inherited by subclasses of that class.

Can we use private and protected access modifier inside an interface?

Interface Access Modifiers

Java interfaces are meant to specify fields and methods that are publicly available in classes that implement the interfaces. Therefore you cannot use the private and protected access modifiers in interfaces.

Can we declare private method in interface C#?

You can’t have private methods in an interface, and you’re not even allowed to specify public as that is implicit for all members of an interface.

Do you declare private and protected modifiers for variables in interfaces?

We cannot declare class/interface with private or protected access specifiers.