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 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 declare protected abstract method in interface?
Yes, you can declare an abstract method 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.
Is final method allowed in interface?
If you make a method final you cannot override it and, if you make a variable final you cannot modify it. … If you make an interface final, you cannot implement its methods which defies the very purpose of the interfaces. Therefore, you cannot make an interface final in Java.
Can we declare interface as static?
Similar to Default Method in Interface, the static method in an interface can be defined in the interface, but cannot be overridden in Implementation Classes. To use a static method, Interface name should be instantiated with it, as it is a part of the Interface only.
Which method Cannot be overridden?
A method declared final cannot be overridden. A method declared static cannot be overridden but can be re-declared. If a method cannot be inherited, then it cannot be overridden. A subclass within the same package as the instance’s superclass can override any superclass method that is not declared private or final.
Can interface method have body?
Interfaces are declared using the interface keyword, and may only contain method signature and constant declarations (variable declarations that are declared to be both static and final ). All methods of an Interface do not contain implementation (method bodies) as of all versions below Java 8.
Can abstract class have method body?
Abstract methods cannot have body. Abstract class can have static fields and static method, like other classes.
Can an interface have private variables?
3 Answers. as you have declare variable in test interface with private and protected it will give error. if you do not specify the modifier the compiler will add public static final automatically. Having private or protected members in an interface doesn‘t make sense conceptually.
Can I declare variable in interface?
In Java , interface doesn’t allow you to declare any instance variables. Using a variable declared in an interface as an instance variable will return a compile time error. You can declare a constant variable, using static final which is different from an instance variable.
What is difference between access specifier and access modifier?
There is no difference between access specifier and access modifier in Java. They both mean the same. Access modifier is the new and official term used instead of access specifier. Java provides four access modifiers to set access levels for classes, variables, methods and constructors.