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Documenting with
Javadoc
How to Write Doc Comments for the
JavadocTM Tool available from java.sun.com.
1
Overview



Need for Javadoc
Writing Javadoc comments
Running the javadoc tool
2
Need for Javadoc

Why document programs?


To make it easy to understand, e.g., for
reuse and maintenance
What to document?


Interface: syntactic vs. semantic (or
behavioral) interfaces
Internal working
3
(Cont.)

Why Javadoc?



To combine source code with documentation
and other reference materials
To make it easier to keep the documentation
and code in sync
To generate API specifications (or interface
specifications) from source code
4
Approach

Javadoc comments


Attach special comments, called
documentation comment (or doc comment)
to classes, fields, and methods.
/** … */
Javadoc tool

Use a tool, called javadoc, to automatically
generate HTML pages from source code.
5
Javadoc Example
/** An abstract class representing various kinds of shapes. */
public abstract class Shape {
/** The x-coordinate of this shape. */
private int x;
// …
/** Returns the x-coordinate of this shape. */
public int getX() { … }
/** Sets the x-coordinate of this shape to the argument
* <code>x</code>.
*/
public void setX(int x) { … }
// …
}
6
Javadoc Tags

Javadoc Tags



Special keyword recognized by javadoc tool.
Will be specially formatted
Common Tags







@author
@version
@since
@param
@return
@throws
@see
Author of the feature
Current version number
Since when
Meaning of parameter
Meaning of return value
Meaning of exception
Link to other features
7
Example
/** An abstract class representing various kinds of
* shapes. This class represents common features
* of all shapes such as …
*
* @author Yoonsik Cheon
* @version 1.0 (01/22/04)
* @since version 0.5
*/
public abstract class Shape {
// …
}
8
Specifying Parameters and Return
Value

Syntax




@param name description
@return description
@throws exception description
Example
/** Returns the definition of a given word in this dictionary.
*
* @param word a word whose definition is being looked up.
* @return the definition of the word; null if no definition is
*
found.
* @throws NullPointerException if the word is null.
*/
public String lookup(String word) { /* … */ }
9
Linking to Other Features

Syntax


@see featureName
where featureName is class, field, or method.
Example
@see Dictionary
@see #elems
@see #lookup(String)
@see SpanishDictionary#lookup(String)
@see cs3331.Score#lookup(String)
10
Exercise

Write Javadoc comments for the following class.
public class ArrayStack {
public ArrayStack(int size) { … }
public Object push(Object elem) { … }
public Object pop() throws StackEmptyException { … }
private Object[] elems;
private int idx;
}
11
Running javadoc Tool

Similar to running javac, e.g.,
javadoc A.java
javadoc A.java B.java
javadoc *.java
javadoc –d javadocs *.java
12
Running javadoc (Cont.)

Linking to existing API specifications
javadoc –link file:c:/Software/jdk1.6.0/docs/api *.java
javadoc –link http://java.sun.com/j2se/1.6.0/docs/api *.java

Including non-public features
Javadoc –private *.java
13