例如，假设我想使用 html 标记链接 java.lang.Double 的 equals 方法：
@see <a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/lang/Double.html#equals(java.lang.Object)">
这没关系，但我不明白如何链接非标准类。
例如，我正在开发两个类，名为 AbstractVehicle 和 Vehicle。但是没有 AbstractVehicle 的 javadoc 文档，因为它的文档还需要生成。
那我如何链接它的方法或类引用？考虑一下：
@see mypackage.AbstractVehilce
这没有放置类 URL，我会在生成文档之前知道如何获取 URL 或它的引用。
我希望问题很清楚，否则请告诉我。
要创建指向特定类的链接{@link mypackage.AbstractVehicle}，您可以使用标签。同样，您可以使用在类{@link mypackage.AbstractVehicle#someMethod}中创建链接。someMethod()AbstractVehicle
更多关于 javadoc 的建议可以在 Oracle 的javadoc - Java API 文档生成器页面中找到。
javadoc 的联机帮助页解释了-link以及-linkoffline哪些控制如何为未传递到的包生成链接javadoc。
-link extdocURL
Creates links to existing javadoc-generated documentation
of external referenced classes. It takes one argument.
extdocURL is the absolute or relative URL of the directory
containing the external javadoc-generated documentation
you want to link to. Examples are shown below. The pack-
age-list file must be found in this directory (otherwise,
use -linkoffline). The Javadoc tool reads the package
names from the package-list file and then links to those
packages at that URL. When the Javadoc tool is run, the
extdocURL value is copied literally into the <A HREF>
links that are created. Therefore, extdocURL must be the
URL to the directory, not to a file.
You can use an absolute link for extdocURL to enable your
docs to link to a document on any website, or can use a
relative link to link only to a relative location. If rel-
ative, the value you pass in should be the relative path
from the destination directory (specified with -d ) to the
directory containing the packages being linked to.
When specifying an absolute link you normally use an http:
link. However, if you want to link to a file system that
has no web server, you can use a file: link - however, do
this only if everyone wanting to access the generated doc-
umentation shares the same file system.
You can specify multiple -link options in a given javadoc
run to link to multiple documents.
Choosing between -linkoffline and -link - One or the other
option is appropriate when linking to an API document that
is external to the current javadoc run.
Use -link: when using a relative path to the external API
document, or when using an absolute URL to the external
API document, if you shell does not allow a program to
open a connection to that URL for reading.
Use -linkoffline : when using an absolute URL to the
external API document, if your shell does not allow a pro-
gram to open a connection to that URL for reading. This
can occur if you are behind a firewall and the document
you want to link to is on the other side.
...
并且-link在生成文档时要求您连接网络，以便它可以通过网络检索包列表，-linkoffline但不需要您自己提供包列表：
-linkoffline extdocURL packagelistLoc
This option is a varition of -link; they both create links
to javadoc-generated documentation for external referenced
classes. Use the -linkoffline option when linking to a
document on the web when the Javadoc tool itself is
"offline" - that is, it cannot access the document through
a web connection.
...
javadoc 工具文档@see中描述了您可以添加的内容。您永远不应该放置任何外部类或方法文档的 URL。相反，您应该输入类/方法名称，并使用-link 选项让 javadoc 为您找出合适的 URL。