Design Patterns Java™ Workbook

Interfaces

Figure C.3 shows the basic features for illustrating interfaces. Following are notes on interfaces.

Figure C.3. You can indicate an inter-face with either an «interface» stereotype or a lollipop.

• You can draw an interface by placing the text «interface» and the name of the interface in a rectangle, as Figure C.3 shows. You can use a dashed line and a closed, hollow arrowhead to show that a class implements the interface.

• You can also show that a class implements an interface by showing a line and circle, or “lollipop,” and the name of the interface.

• Interfaces and their methods are always abstract in Java. Oddly enough, interfaces and ...