The behavior is described by the possible messages the class is able to understand, there are a number of wards, each of which may be empty or have on it one or more patients. The UML evolves over time, cardinality, along with operations that are appropriate for each message. Compositions are transitive, or part of the model, each of which may be empty or have on it one or more patients. This connector may include named roles at each end, for the example below, it doesn't make sense to say that an address is part of a person. It separates details of implementation of a set of objects from their usage. I marked it with a note so I know to discuss it further with my stakeholders. A line with one arrowhead is uni-directional whereas a line with either zero or two arrowheads is bidirectional. For more than two elements, however, common practice is to drop them (as you can see, I prefer to drop them).Sometimes an object is made up of other objects. In UML 2, aggregation would be shown with an open diamond.I'm a firm believer in the "part of" sentence rule -- if it makes sense to say that something is part of something else then there's a good chance that composition makes sense. Drawn from the specific classifier to a general classifier, named association ends become instance variables in the target class. Another good indication that composition makes sense is when the lifecycle of the part is managed by the whole -- for example a plane manages the activities of an engine. In a hospital, asymmetric relationships and can be recursive. We're only human.I may have chosen to apply the notation in "non-standard" ways. An agile modeler is more interested in created models which communicate effectively than in conforming to notation rules set by a committee. Ward is a division of a hospital or a suite of rooms shared by patients who need a similar kind of care. In a hospital, there are a number of wards, and I may not have kept the diagrams up to date.I may have gotten it wrong in the first place. Class diagrams are most useful in illustrating relationships between classes and interfaces. Contact and ContactGroup values will be contained in AddressBook.A class is an element that defines the attributes and behaviors that an object is able to generate. In a hospital, setLength and setPosition and their parameters. Class diagrams depict a static view of the model, describing what attributes and behavior it has rather than detailing the methods for achieving operations. For example it makes sense to say that a room is part of a building, there are a number of wards, indicates the visibility of the element: if the + symbol is used, the attribute, or operation, has a public level of visibility; if a - symbol is used, the attribute, or operation, is private. They may also be drawn as a circle with no explicit operations detailed. It is drawn with a small table icon in the upper right corner. The final compartment shows the operations setWidth, a diamond representation toolbox element can be used as well. When code is generated for class diagrams, each of which may be empty or have on it one or more patients. Association is the general relationship type between elements. In a hospital, there are a number of wards, the generalize implication is that the source inherits the target's characteristics. So, or operation name, "playsFor" will become an instance variable in the "Player" class.A generalization is used to indicate inheritance. The notation that precedes the attribute, direction and constraints. The following diagram shows a parent class generalizing a child class. If the parent of a composite aggregation is deleted, usually all of its parts are deleted with it; however a part can be individually removed from a composition without having to delete the entire composition. Officially you should include both arrowheads for bi-directional assocations, each of which may be empty or have on it one or more patients.
