does an interface have a constructor

Can We have a private constructor?

Yes, we can declare a constructor as private. If we declare a constructor as private we are not able to create an object of a class. We can use this private constructor in the Singleton Design Pattern. Conditions for Private Constructor. A private constructor does not allow a class to be subclassed.

Can an interface have a property?

Properties can be declared on an interface. The following example declares an interface property accessor: Interface properties typically don't have a body. The accessors indicate whether the property is read-write, read-only, or write-only.

Can interface inherit from a class?

The class that implements interface must implement all the methods of that interface. To implement the above interface, we can have: Also, it is possible for a java interface to inherit from another java interface, just like classes can inherit from other classes. You specify inheritance using the extends keyword.

Do all class need Constructors?

Yes all the classes which we create in java comes up with default constructor with no parameters. That means after that you can only create objects of that class with parameterized constructor and to use the non parametrized constructor you have to created that one.

Which is better: a factory interface or a delegate?

Either have a factory interface, or pass a Func<DataRow, T> into your constructor. (They're mostly equivalent, really. The interface is probably better for Dependency Injection whereas the delegate is less fussy.)

Can abstract classes implement interfaces?

you can also have your abstract class implement an interface if you want...

Can'thave constructorin interfacein Java?

1. You can'thave constructorin Interfacein java.

Can Java use constructors?

Unlike say C#, Java's interfaces cannot prescribe a constructor.

Can abstract classes be used instead of interface?

The accepted solution for this particular stack overflow question had been a suggestion of using an abstract class instead of an interface; since abstract classes allow the definition of a constructor. This is a perfectly acceptable solution but we can actually do better than this.

Can you define a constructor in C#?

The technical answer is that you can't; defining a constructor on an Interface is not allowed in any programming language that I know of, definitely not in C#. However there is a sneaky way to get the same desired behavior. First though, the main reason why you can't have a constructor defined on an Interface is because it would create quite ...