Java Reference
In-Depth Information
Figure C.2. A
MachineComposite
object contains either
Machine
objects or other
composites. The
Customer
class depends on the
LikeMyStuff
class without
instantiating it.
•
Show a class name or a method name in italics to indicate that the class or method is
abstract.
•
Use a closed, hollow arrowhead to point to a class's superclass.
•
Use a line between classes to indicate that instances of the classes are connected. Most
commonly, a line on a class diagram means that one class has an instance variable that
refers to the other class. The classes
MachineComposite
class, for example, uses a
List
variable that contains references to other machine components.
•
Use a diamond to show that instances of a class contain a collection of instances of
another class.
•
An open arrowhead indicates navigability. Use it to emphasize that one class has a
reference to another and that the pointed-to class does not have a back reference.
•
A multiplicity indicator, such as
0..1
, indicates how many connections may appear
between objects. Use an asterisk (
*
) to indicate that zero or more instances of an
object of a class may be connected to objects of an associated class.
•
To show that a method may throw an exception, use a dashed arrow pointing from the
method to the exception class. Label the arrow with a
«throws»
stereotype.
