Require links connect classifiers and interfaces. A require link can connect a class, a component, or a port on the outside of one of these classifiers to an interface.
A require link can be created in the following diagrams:
Require Links in a Class Diagram
In the example below, require links connect the class TitleImpl with the interfaces java.math.stat and java.sql.connection. Note how the require link can proceed from a port or directly from the class