Java Reference
In-Depth Information
•
Indicate a package by placing the name of the package in a rectangle left-aligned with
a larger box that may show classes and interfaces. Figure C.1 shows a portion of the
com.oozinoz.fireworks
package.
•
UML does not require that a diagram show everything about a portrayed element, such
as the complete contents of a package or all the methods of a class.
•
Draw a class by placing the name of a class centered in a rectangle. Figure C.1 shows
two classes:
Classification
and
Firework
.
•
You can show a class's instance variables in a rectangle beneath the class name. The
Firework
class has instance variables
name
,
price
, and
classification
.
Follow the variable's name by a colon and the variable's type.
•
You can show a class's methods in a second rectangle beneath the class name. The
Firework
class has a constructor, a method with the same name as the class. The
class also has at least three other methods:
flies()
,
getName()
, and
setClassification()
.
•
When a method accepts parameters, you should usually show them, as the
setClassification()
method does.
•
Variables in method signatures usually appear as the name of the variable, a colon,
and the type of the variable. You may omit or abbreviate the variable name if its type
implies the variable's role.
•
You may indicate that an instance variable or a method is protected by preceding it
with a pound sign (
#
). A plus sign (
+
) indicates that a variable or a method is public,
and a minus sign (
-
) indicates that a variable or a method is private.
•
Indicate that an instance variable is static—and thus has class scope—by underlining
it, as the
flies()
method shows.
•
Make notes by drawing a dog-eared rectangle. The text in notes may contain
comments, constraints, or code. Use a dashed line to attach notes to other diagram
elements. Notes can appear in any UML diagram, although this topic uses notes only
in class diagrams.
Class Relationships
Figure C.2 shows a few of UML's features for modeling class relationships. Following are
notes on class relationship notation.
