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Why we use interface and how we can implement it?
Like a class, an interface can have methods and variables, but the methods declared in an interface are by default abstract (only method signature, no body). Interfaces specify what a class must do and not how. If a class implements this interface, then it can be used to sort a collection. …
Why do you need to implement all the methods of an interface in class which implements an interface?
Yes, it is mandatory to implement all the methods in a class that implements an interface until and unless that class is declared as an abstract class. Declare the class as an abstract class, as a result, forces you to subclass the class (and implement the missing methods) before you can create any objects.
Why do we implement interface?
The implements keyword is used to implement an interface . The interface keyword is used to declare a special type of class that only contains abstract methods. To access the interface methods, the interface must be “implemented” (kinda like inherited) by another class with the implements keyword (instead of extends ).
Why Interface is used instead of class?
Having interfaces separate from classes allows for clear separation between, well, the interface of an object and its implementation. Without them you would have no standard way to indicate that some class should not contain implementation details at all.
How do you implement an Interface?
To declare a class that implements an interface, you include an implements clause in the class declaration. Your class can implement more than one interface, so the implements keyword is followed by a comma-separated list of the interfaces implemented by the class.
Can a class implement an interface in another class?
The classes that implement a interface need not be descendant from the same parent class but other classes that want to ensure a contract exists, can call the same methods on objects of all classes that implement the interface. Interface ensures that this contract is available.
Why do you want to use an interface?
The key point is that interfaces provide a layer of abstraction so that you can write code that is ignorant of unnecessary details. The canonical example used in most textbooks is that of sorting routines. You can sort any class of objects so long as you have a way of comparing any two of the objects.
How are base and derived classes defined in C #?
Above we’ve defined two classes: an abstract base Vehicle class which has a virtual and non-virtual method which both do the same thing, and a Motorcycle class which implements the Vehicle class while overriding the virtual method and shadowing the normal method. Now we will call the methods with different Type signatures to see the differences:
Why do you use interfaces in parallel development?
Parallel development, and fewer bugs. The key point is that interfaces provide a layer of abstraction so that you can write code that is ignorant of unnecessary details. The canonical example used in most textbooks is that of sorting routines. You can sort any class of objects so long as you have a way of comparing any two of the objects.