A.1 Classes


 
Building Parsers with Java
By Steven  John  Metsker

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Appendix  A.   UML Twice Distilled

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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.

graphics/afig01.gif

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.)


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

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