Figure A.3 shows the basic features for illustrating interfaces.
In Figure A.3, note the following.
A diagram can show that a class implements an interface by showing a line and circle (a “lollipop”) and the name of the interface. The Assembly class, for example, implements the Enumeration and PubliclyCloneable interfaces.
A diagram can also show an interface by placing the text <<interface>> and the name of the interface in a rectangle, as Figure A.3 ...