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 we use protected in interface in Java?

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 and protected access modifier inside a 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.

Which modifier is not allowed in interface?

No other modifiers (private and protected) are allowed within an interface neither with fields nor with any methods. Obviously among modifiers, private has no meaning to use within an interface but protected should be allowed within an interface because it can be incorporated by it’s implementing class.

Why interface methods Cannot have access modifiers?

Interface members are always public because the purpose of an interface is to enable other types to access a class or struct. No access modifiers can be applied to interface members. All the interface methods are Public. You can’t create an access modifier in interface.

Which modifiers are allowed for methods in an interface?

Answer: Only public and abstract modifiers are allowed for methods in an interfaces.

Can I use protected in 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 we declare protected abstract methods in an interface?

Yes, you can declare an abstract method protected.

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 interface have access modifier in Java?

Just like with classes, a Java interface can be declared public or package scope (no access modifier).

Which of the modifiers are allowed for interface in Java?

As of Java7 you can have only public, abstract as modifiers for the methods of an interface. Using any other modifier with the methods of an interface would lead to a compile time error.

Can we use access specifier with interface in Java?

The public access specifier indicates that the interface can be used by any class in any package. An interface can extend other interfaces, just as a class subclass or extend another class. However, whereas a class can extend only one other class, an interface can extend any number of interfaces.