CAN interface have return type in C#?
5 Answers. Yes, you can return an interface.
Is interface return type?
Yes an interface is a very valid return value. Remember, you’re not returning the definition of the interface, but rather an instance of that interface. now you could return a number of different ICar instances that have their own respective values.
What is interface data type in C#?
Interfaces define properties, methods, and events, which are the members of the interface. Interfaces contain only the declaration of the members. Some of the interface types in C# include. IList − A generic interface implemented by the arrays and the list type.
Which of the following is the correct way of implementing an interface addition by class maths?
Discussion Forum
| Que. | Which of the following is the correct way of implementing an interface addition by class maths? |
|---|---|
| b. | class maths implements addition {} |
| c. | class maths imports addition {} |
| d. | none of the mentioned |
| Answer:class maths : addition {} |
Can interface methods have return type in Java?
3 Answers. If the return type must be the type of the class that implements the interface, then what you want is called an F-bounded type: public interface A>{ public T b(); } public class C implements A{ public C b() { } } public class D implements A{ public D b() { } }
Can I return an interface in Java?
Returning an interface is no different than returning an object because an interface is an object. If a method returns an interface, it means the returning method is deciding what implementation to give you and the interface tells you how to interact with that implementation in a common way.
What is implicit interface in C#?
With implicit interface implementations, the members of the interface are public in the class. With explicit implementations, in the class the interface members are not declared as public members and cannot be directly accessed using an instance of the class, but a cast to the interface allows accessing the members.
What is the difference between interface vs type statements?
The key distinction is that a type cannot be re-opened to add new properties vs an interface which is always extendable. Show activity on this post. One difference is that interfaces create a new name that is used everywhere. Type aliases don’t create a new name — for instance, error messages won’t use the alias name.
Why interface is used in C#?
By using interfaces, you can, for example, include behavior from multiple sources in a class. That capability is important in C# because the language doesn’t support multiple inheritance of classes. A class or struct can implement multiple interfaces, but a class can only inherit from a single class.
How can use interface method in C#?
To declare an interface, use interface keyword. It is used to provide total abstraction. That means all the members in the interface are declared with the empty body and are public and abstract by default. A class that implements interface must implement all the methods declared in the interface.
Which keyword is used for correct implementation of an interface in C#?
Discussion Forum
| Que. | Which keyword is used for correct implementation of an interface in C#.NET? |
|---|---|
| b. | Interface |
| c. | intf |
| d. | Intf |
| Answer:interface |
Which of the following is the correct about interfaces in C#?
Which of the following statements is correct about an interface used in C#.NET? One class can implement only one interface. In a program if one class implements an interface then no other class in the same program can implement this interface. From two base interfaces a new interface cannot be inherited.