java -cp yourjar.jar package.Main1

java -cp yourjar.jar package.Main2

Read the docs for the java command, it's all explained there :)

Thomas

eli.hen@gmail.com wrote on 18.12.2005 12:11:

How are you expecting to select between the two? If you can set the
command line then, as Thomas Kellere suggested, put the jars on the
class-path and use the execute a class form of the java command.
Alternatively, add a new class as the main-class that determines which
of the other classes to run.

However, I'd suggest it is not normally worthwhile. You might as well
just have two smaller jar files. If you don't want duplication, you can
add to the class-path through the manifest.

http://java.sun.com/docs/books/tutorial/jar/manifest/downman.html

Tom Hawtin

Sure, you can do that, but[1]

One way is as described ny Thomsa Kellerer, to
launch two different mains from the one Jar by
invoking the class from the command line.

Another, more user-friendly way to deploy the
applications is using Webstart/JWS, which would simply
require you to specify a different main in each JNLP
descriptor.

*Note the jar file/s for JWS would need to be signed if
you intend the application/s to gain the 'full priviliges'
usually given to an app. launched from the command line.*

[1] ..but, as Thomas Hawtin suggested, it may
not make sense to deploy the mains and core classes
in the same jar.  Instead consider breaking it into
the 'common library' jar, with each main class and
it's own unique classes in a second (third, fourth..)
jar.

Webstart/JWS can handle that as well, and will only
deliver the library application once, even if it is
used for 10 different applications (or Webstarted
applets).

Not with the JWS option..