Question

I would like class B to inherit the Javadoc from an interface that it implements, interface A. I have included the source for interface A in my Javadoc command, and class B correctly inherits the documentation.

Now I’m wondering if I can make the links it generates point to interface A‘s documentation on the web, rather than duplicating it on my site, i.e. the “Specified by:” links will link to an external page.

Is this possible?

Answer 1

It is possible, yes.
For being able to include inherited documentation, the source of interface A has to be findable in the sourcepath of javadoc, but should not be in the list of packages passed to javadoc for documentation creation.
For linking, use the -link parameter. I just tried this (with the ant javadoc task):

<javadoc destdir="docs">
  <sourcepath>
    <!-- source of your class B -->
    <pathelement location="src" /> 
    <!-- source of external interface A -->
    <pathelement location="../example-src/src" />
  </sourcepath>

  <!-- your packages, to generate the docs for -->
  <package name="com.personal.myproject.*" />

  <!-- the location of the online documentation -->
  <link href="http://example.com/javadoc/"/>
</javadoc>

To command line javadoc, I think this translates like this (unix syntax, one line):

 javadoc -sourcepath ../example-src/src:src
         -d docs
         -link http://example.com/javadoc/
         -subpackages com.personal.myproject
         (other options...)

where

• class B is in package com.personal.myproject,
• interface A is in package com.example,
• my own sources are in src,
• the sources for interface A are in ../example-src/src.

In a example class created for this, javadoc would copy the documentation from A.methodName() to B.methodName(), but link to the online documentation at http://example.com/javadoc/com/example/A.html#methodName().

Thanks for asking this question, I always wanted to do this 🙂