jsc is a decompiler or a cross compiler if you will. It is not a source-code parser nor an IDE. It is a command line utility like any other compiler. jsc was originally an anagram for csharp to javascript.
NET2Java a new technology that helps you take an application written in Visual Basic or C# to the .NET platform, and translate it into a program written in Java source code. Right now its available through a NetBeans plugin that's included in the distribution files.
M. Rigger, S. Marr, B. Adams, and H. Mössenböck. Proceedings of the 2019 27th ACM Joint Meeting on European Software Engineering Conference and Symposium on the Foundations of Software Engineering, ACM, (August 2019)