Interfaces

An interface provides the input and output of a component. It is created independent of the internal implementation of the component.

In the diagram that follows, interfaces, indicated by an I, link the components in a module. The inputs and outputs of each component, specified by the interface, determine which data can be passed from one component to another. An interface is created independent of the implementation of the component. An interface may also be created for a component that has no implementation; that is, the implementation will be done later.