The left-hand side of the diagram shows the definition of a local interface I1 and the declaration and implementation parts of a local class C1 that implements the interface I1 in its public section. The interface method I1~M1 is implemented in the class. You cannot implement interfaces in the other visibility sections.

The right-hand side illustrates the structure of the class with the components in their respective visibility areas, and the implementation of the methods. The interface components extend the public scope of the class. All users can access the public components specific to the class and those of the interface.