Dan acts as scribe, capturing the domain objects as a UML diagram using his patterns and Together. Behind the scenes there is Java code but we don't need to show that, so we don't. We then start to ...

An object in UML maps directly to an object in Java. However, when developers create Java applications, they're creating Java classes, not Java objects.

Package Packages (Figure B) are general-purpose grouping mechanisms. A package in UML translates directly into a package in Java. In Java, a package can contain other packages, classes, or both.