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oop - What is the definition of interface in object oriented . . . An interface promises nothing about an action! The source of the confusion is that in most languages, if you have an interface type that defines a set of methods, the class that implements it "repeats" the same methods (but provides definition), so the interface looks like a skeleton or an outline of the class
Whats the difference between interface and @interface in java? 42 The interface keyword indicates that you are declaring a traditional interface class in Java The @interface keyword is used to declare a new annotation type See docs oracle tutorial on annotations for a description of the syntax See the JLS if you really want to get into the details of what @interface means
What is the difference between an interface and abstract class? An interface is a good example of loose coupling (dynamic polymorphism dynamic binding) An interface implements polymorphism and abstraction It tells what to do but how to do is defined by the implementing class
Not implementing all of the methods of interface in Java, is it . . . The point of an interface is to guarantee that an object will outwardly behave as the interface specifies that it will If you don't implement all methods of your interface, than you destroy the entire purpose of an interface
Implementing two interfaces in a class with same method. Which . . . If both interfaces have a method of exactly the same name and signature, the implementing class can implement both interface methods with a single concrete method However, if the semantic contracts of the two interface method are contradicting, you've pretty much lost; you cannot implement both interfaces in a single class then
How can I define an interface for an array of objects? Yes, your example of defining an interface only for the particular items would be a more useful way to do it It would be quite rare to have an array of items, but not want to conveniently reference a single item Using a real array also exposes length on the interface, which will probably be used quite often
c# - Class vs. Interface - Stack Overflow But Interface is a contract which tells its implantations to provide if it is not an abstract class And the One important difference between a class and interface is that class inheritance will give relation between two common subclasses Where as Interface implementation gives a relation between two uncommon classes
c# - Interfaces — Whats the point? - Stack Overflow An interface is somewhat like an abstract base class, but with a key difference: an object which inherits a base class cannot inherit any other class By contrast, an object may implement an interface without affecting its ability to inherit any desired class or implement any other interfaces