It's possible to create a J# application which is source-code compatible
with Java. However, when you compile J# source, you get .Net intermediate
language, not the Java byte codes that you'd need to work with a JRE.

Regards,
Will

Programs created with J# language don't run in Java Virtual Machine.

The run only using the .NET framework.

And the bad new is that J# will no longer be included in the future release
of VStudio by microsoft

Retirement of J# language and Java Language Conversion Assistant from future
versions of Visual Studio
Since customers have told us that the existing J# feature set largely meets
their needs and usage of J# is declining, Microsoft is retiring the Visual
J# product and Java Language Conversion Assistant tool to better allocate
resources for other customer requirements. The J# language and JLCA tool
will not be available in future versions of Visual Studio. To preserve
existing customer investments in J#, Microsoft will continue to support the
J# and JLCA technology that shipped with Visual Studio 2005 through to 2015
as per our product life-cycle strategy. For more information