A.1 Classes

Building Parsers with Java
By Steven  John  Metsker

Table of Contents
Appendix  A.   UML Twice Distilled


Figure A.1 applies some of the UML features for illustrating classes.

Figure A.1. Classes. Note that there is no guarantee that a UML diagram portrays every element of a package or class. The amount of detail in a diagram depends on the objective of the illustrator.


In Figure A.1, note the following.

  • A package appears as the name of the package in a rectangle left-aligned with a larger box that may show classes and interfaces. Figure A.1 shows a portion of the sjm.parse package.

  • A class appears as the name of a class centered in a rectangle. Figure A.1 shows three classes: Assembler , Assembly , and Repetition .

  • A diagram may show a class's instance variables and methods in rectangles beneath the class name. Class Repetition has an instance variable subparser , of type Parser . This class also has (at least) one constructor and (at least) one method, match() .

  • Instance variable declarations appear as the name of the variable followed by a colon and the type of the variable, as in subparser:Parser .

  • Variables in method signatures also appear as the name of the variable followed by a colon and the type of the variable.

  • A diagram that shows a method such as match() may also show the method's signature in the parentheses after the name. A colon and the return type of the method may follow this.

  • A class diagram 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 method is public.

  • A diagram may indicate that an instance variable is static (and thus has class scope) by underlining it. (Figure A.1 does not show this feature.)


Building Parsers with Java
Building Parsers With Javaв„ў
ISBN: 0201719622
EAN: 2147483647
Year: 2000
Pages: 169

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