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Getting Started
When you build a house, you start with a vocabulary that includes basic building blocks, such as walls, floors, windows, doors, ceilings, and joists. These things are largely structural (walls have height, width, and thickness), but they re also somewhat behavioral (different kinds of walls can support different loads, doors open and close, there are constraints on the span of a unsupported floor). In fact, you can't consider these structural and behavioral features independently. Rather, when you build your house, you must consider how they interact. The process of architecting your house thus involves assembling these things in a unique and pleasing manner intended to satisfy all your functional and nonfunctional requirements. The blueprints you create to visualize your house and to specify its details to your contractors for construction are, in effect, graphical presentations of these things and their relationships.Building software has much the same characteristics except that, given the fluidity of software, you have the ability to define your own basic building blocks from scratch. With the UML, you use class diagrams to visualize the static aspects of these building blocks and their relationships and to specify their details for construction, as you can see in Figure 8-1.
Figure 8-1. A Class Diagram
