To make development portable to Java, does it make sense to do the whole development on J# vs C#?

To make development portable to Java, does it make sense to do the whole development on J# vs C#? What happens to missing bits in Java that exist in C# like lambda expression and so on?

What is the be开发者_如何学运维st way to achieve portability?

I definitely wouldn't use J# - it's not supported any more, and it only supported Java 1.1.4 anyway, IIRC.

I would personally recommend keeping the overall architecture consistent between the two languages, but then write the code separately, manually, taking into account the different idioms in the different languages.

If your codebase uses data-driven tests, it would be good to share that data between the two languages, as a way of helping to ensure data portability.

I suggest you don't use J# anymore as it has been discontinued. The last version has been shipped with Visual Studio 2005.

In addition to J#-specific language extensions and .NET CLR support, its runtime library implements Java 2 Collections Framework (without the java.util.concurrent extensions, though) and even some JFC/Swing, via the Supplemental UI Library.

So you'll be limited to the Java 1.4 API.

Given that J# has been discontinued long ago, I wouldn't suggest you invest your time into it.

If you really need portability between JVM and CLR, I'd take a look at IKVM (implements Java 1.7 API on top of CLR), Scala for .NET (discontinued circa Scala 2.10) or languages like Ruby (JRuby/IronRuby) or Python (Jython/IronPython).

Alternatively, you can generate your C# for .NET -- there're Java to C# converters available.