Big Java, 4th Edition

Appendix K. UML Summary

In this book, we use a very restricted subset of the UML notation. This appendix lists the components of the subset.

For a complete discussion of the UML notation, see The Unified Modeling Language User Guide, Grady Booch, James Rumbaugh, and Ivar Jacobson (Addison-Wesley, 2005, 1999).

CRC Cards

CRC cards are used to describe in an informal fashion the responsibilities and collaborators for a class. Figure 1 shows a typical CRC card.

Figure K.1. Typical CRC Card

UML Diagrams

Figure 2 shows the UML notation for classes and interfaces. You can optionally supply attributes and methods in a class diagram, as in Figure 3.

Figure K.2. UML Symbols for Classes and Interfaces

Figure K.3. Attributes and Methods in a Class Diagram

Figure K.4. An Aggregation Relationship with Multiplicities

Table 1 shows the arrows used to indicate relationships between classes. Multiplicity can be indicated in a diagram, as in Figure 4.

Table K.1. UML Relationship Symbols

Relationship	Symbol	Line Style	Arrow Tip
Inheritance	Solid	Triangle
Interface Implementation	Dotted	Triangle
Aggregation	Solid	Diamond
Dependency ...