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Why can not define private and protected modifiers for variables in interface?
Wiki User
∙ 11y ago
No. Interface variables are supposed to be public static final. Interfaces, like abstract classes, cannot be instantiated, so all variables in an interface must be static final ones. They are public because usually interfaces are used throughout an application, and this will ensure versatility.
Wiki User
∙ 11y ago
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Why you are mark a class protected for inheritance?
Public, Private and Protected "keywards/ access modifiers" are used similarly as they are with variables. Protected variables, methods or class CAN ONLY be used by an inherited class.
Difference between class and interface in java?
A class is a data type. An interface consists of the private, protected and public members of a class, allowing consumers of the class to interact with the class representation in a controlled manner. The private interface is only accessible to the class itself and to friends of the class. The protected interface is similar to the private interface but is also accessible to derivatives of the class. The public interface is fully accessible. The private and protected interfaces are intended purely for use by the class implementers while the public interface is intended for use by both consumers and implementers.
How can access an interface from another interface and how to access from a class?
Interfaces are designed to do exactly that: to interface or to interact. In object-oriented programming languages such as C++, you can incorporate up to three different interfaces per class. The private interface is accessible only to the class itself and to friends of the class. The protected interface is the same as the private interface but is also accessible to derivatives of the class. The public interface is accessible to any code. For one interface to interact with another interface, the first must have access to the second. If the first is a friend of the second or both are members of the same class, the first has unrestricted access to the private, protected and public interfaces of the second. If the first is derived from the second but is not a friend, the first only has access to the protected and public interfaces of the second. If the first is completely separate from the second, the first only has access to the public interfaces of the second.
What modifiers may be used with top-level class?
A top-level class in Java may be declared with one or more modifiers:Access modifiers: public or package-private (no explicit modifier).Modifier requiring override: abstractModifier prohibiting value modification: finalModifier forcing strict floating point behavior: strictfpAnnotationsTop-level classes cannot be static and not all combinations of modifiers are allowed; e.g. class cannot be declared both abstract and final.Access level modifiers at the member level-public, private, protected, or package-private (no explicit modifier).
In java by default all class variables are public protected or private?
The default (no qualifiers) is different from any of those three.
Why you are mark a class protected for inheritance?
Public, Private and Protected "keywards/ access modifiers" are used similarly as they are with variables. Protected variables, methods or class CAN ONLY be used by an inherited class.
What is an access specifier do?
There is no such thing as an access specifier in Java. There are access modifiers. They specify the access level of the item they modify: public, private, protected.
Difference between class and interface in java?
A class is a data type. An interface consists of the private, protected and public members of a class, allowing consumers of the class to interact with the class representation in a controlled manner. The private interface is only accessible to the class itself and to friends of the class. The protected interface is similar to the private interface but is also accessible to derivatives of the class. The public interface is fully accessible. The private and protected interfaces are intended purely for use by the class implementers while the public interface is intended for use by both consumers and implementers.
What modifiers may be used with top-level class?
A top-level class in Java may be declared with one or more modifiers:Access modifiers: public or package-private (no explicit modifier).Modifier requiring override: abstractModifier prohibiting value modification: finalModifier forcing strict floating point behavior: strictfpAnnotationsTop-level classes cannot be static and not all combinations of modifiers are allowed; e.g. class cannot be declared both abstract and final.Access level modifiers at the member level-public, private, protected, or package-private (no explicit modifier).
How can access an interface from another interface and how to access from a class?
Interfaces are designed to do exactly that: to interface or to interact. In object-oriented programming languages such as C++, you can incorporate up to three different interfaces per class. The private interface is accessible only to the class itself and to friends of the class. The protected interface is the same as the private interface but is also accessible to derivatives of the class. The public interface is accessible to any code. For one interface to interact with another interface, the first must have access to the second. If the first is a friend of the second or both are members of the same class, the first has unrestricted access to the private, protected and public interfaces of the second. If the first is derived from the second but is not a friend, the first only has access to the protected and public interfaces of the second. If the first is completely separate from the second, the first only has access to the public interfaces of the second.
In java by default all class variables are public protected or private?
The default (no qualifiers) is different from any of those three.
When you implement an interface method it should be declared as public in java?
This is not necessarily true. The only rules for this are that interface methods may not be private. They may be public, protected, or have the default (blank) access modifier.
What is the explanation for the different access modifiers in Java?
An Access Modifier is a key word in java that determines what level of access or visibility a particular java variable/method or class has. There are 4 basic access modifiers in java. They are:PublicProtectedUnspecified (package-private)PrivateClasses can only be declared public or left unspecified (the "package-private" default level). Methods can be declared any of the above.See the Link on the Java Tutorial for a very good explanation of the various levels of access each modifier provides.
What is the application of public protected and private keywords?
The public, protected, and private keywords are access modifiers that specify if the item they modify can be accessed inside or outside the class or a derived class.A public item is fully accessible, inside or outside the class, including inside a derived class.A protected item is accessible only inside the class or inside a derived class.A private item is accessible only inside the class.
What is class modifiers in java?
Class Modifiers are access modifiers that specify the accessibility levels of a class. There are 4 basic access modifiers in java. They are: 1. Public 2. Protected 3. Default and 4. Private Java programming does not run by just a single piece of class that has the whole functionality. You have hundreds of classes that interact with one another, passing data between them and returning output to the user of the system. So it is very important for members of one class to access members of another. Here members may refer to variables, methods and even classes. So, this is where the access modifiers come into picture. The modifier associated with every member of the class determines what level of visibility that member has.
What are the two parts of class specification in c plus plus programming?
There are more than two, but the class name and interface would be the minimum specification for any class. The interface can be further divided into public, protected and private access, each of which may contain member methods and/or member variables, which may themselves be static and/or non-static. The last part of the specification are the friend declarations, if required.
What is the difference between protected and friend in c plus plus?
The private, protected and public keywords are used to modify the access specifiers of class or struct members. Unless otherwise specified, class members are private by default, while struct members are public by default. Private members of a class are only accessible to members and to friends of that class. Protected members are the same as private members, but are also accessible to derived classes. Public members have unrestricted access. The private, protected and public access specifiers can also be used to modify the type of inheritance that applies to a derived class. Private inheritance means all public and protected members of the base class become private members of the derived class. Protected inheritance means all public members of the base class become protected members of the derived class. Public inheritance means all public and protected members of the base class remain public and protected members of the derived class. Private members of the base class are never inherited by derived classes. A derived class or one or more of its member functions may be declared a friend of the base class, thus permitting private access, but you would never do this unless the hierarchy were a closed, static hierarchy where all derivatives can be determined at compile time. Dynamically bound derivatives of unknown origin cannot be declared friends.
