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Javadoc

Javadoc. Prasad Perera COMP 249. Comments in Java. // Can be single line comments. /* More than one line. Useful to "erase" a block of code from compilation */. /** * A Javadoc comment * To generate nice HTML documentation */. What is Javadoc?.

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Javadoc

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  1. Javadoc Prasad Perera COMP 249

  2. Comments in Java // Can be single line comments /* More than one line. Useful to "erase" a block of code from compilation */ /** * A Javadoc comment * To generate nice HTML documentation */

  3. What is Javadoc? • A standard for documenting Java programs . • Allows you to attach descriptions to classes, constructors, fields, interfaces and methods in the generated html documentation by placing Javadoc comments directly before their declaration statements. • Ex: /** * * The Student class implements methods to calculate student grades. */ publicclass Student {

  4. Javadoc Compilation • javadoc.exe • Generates documentation of your Java classes in a standard format • Comes with the JDK. • For each X.java, it will create an X.html plus a couple of additional pages (index, ..)

  5. Javadoc Compilation Cont’d. • Basic command line compilation: • Javadoc [options] [files] • some basic Javadoc options -author -classpath [path]  / [path];[path]; -sourcepath [path] / -sourcepathlist  [path];[path]; -version • Ex: • c:\> Javadoc -version 1.1 -sourcepath C:\Mysources –classpath C:\Mylibs

  6. Javadoc Compilation Cont’d. • Generate javadoc using eclipse

  7. Generate javadoc using eclipse Cont’d.

  8. Javadoc files

  9. General form of a Javadoc comment /** * One sentence ending with a period describing the purpose. * Additional lines giving * more details (html tags can be included) * * javadoc tags to specify more specific information, * such as parameters and return values for a method * * @Tag Description ... * @Tag Description ... * */

  10. Tags • Allow you to specify specific information used in the HTML file • most common tags: • For files, classes and interfaces: @author Name @version Version number • For methods: @param name description @return description @exception exceptionClass description @deprecated description • For everything: @see relatedReference (ex. other class name)

  11. Documenting Java Files, Classes and Interfaces /** * The Student class implements methods to calculate student grades. * @authorprasad * @version 1.1 * @see String */ publicclass Student {

  12. Documenting Java Files, Classes and Interfaces Cont’d.

  13. Documenting Methods • Javadoccomments go immediately before the method definition • Common tags : • @param <name of parameter> <description> • @return <description> • ex: /** * Calculates the overall score for all the marks according to their weights * @parammidExamMark mid exam mark * @paramfinalExamMark final exam mark * @return The final score calculated */ publicdoublecalculateOverallScore(intmidExamMark, intfinalExamMark){

  14. Documenting Methods Cont’d.

  15. Javadoc Extra • Can add Html tags to the comments to add nicer formatting to the resulting document. • Advantages: • looks very nice… • provides a consistent look and feel to API documents • when source code is changed: • the Javadoc comments can be changed in the source, at the same time. • the external documentation is then easily re-generated.

  16. Javadoc Extra Cont’d. /** * <p style="font-family:algerian;color:blue;font-size:20px;">The Student class implements methods to calculate student grades. :)</p> * @authorprasad * @version 1.1 * @see String */ publicclass Student {

  17. References • Previous Javadoc tutorials (COMP 248) • http://students.cs.byu.edu/~cs240ta/fall2012/tutorials/javadoctutorial.html • http://www.oracle.com/technetwork/java/javase/documentation/index-jsp-135444.html

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