Developing interfaces

In VB, interfaces work similarly to other OOP languages. An interface in VB defines a contract that specifies a set of method signatures that classes must implement. By implementing an interface, a class agrees to provide concrete implementations for all the methods declared in the interface.

Next, we will see how to define and use interfaces in VB.

Interface declaration

To create an interface in VB, you can use the Interface keyword, followed by the interface’s name:

Public Interface IShape
    Sub Draw()
    Function GetArea() As Double
End Interface

In this example, we defined an IShape interface with two methods: Draw and GetArea. These methods are declared but not implemented in the interface; their implementation will be provided by the classes that implement this interface.

Implementing an interface

To implement an interface, a class must use the Implements keyword, followed by the interface...