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Definition - What does J# mean?

J# is a programming language that provides developers with a set of tools for developing Java applications that can run on Microsoft’s .NET runtime platform.

This term is also known as Visual J# (often pronounced as "Jay-Sharp").

Techopedia explains J#

The non-Java conventions used in J# make the language friendlier for the .NET environment. Though Java and J# use a common syntax, they differ in that J# uses non-Java conventions to support the .NET Framework. J# has the ability to support Component Object Model (COM) objects and the J/direct interface to Microsoft Windows.

The .NET Framework offers several features that facilitate application development with J#. Some of these features are:

  • The compiler helps to convert Java Language source code to Microsoft Intermediate Language (MSIL).
  • It has class libraries.
  • It has a Java language bytecode converter (for converting bytecode to MSIL), which is very useful when the Java source code is not available.
  • It includes,, and packages.
  • Its files have the extension .jsl.

The J# compiler offers a wide range of options which can be used with command-line switches:

  • /o: Enable compiler optimization.
  • /debug: Emit debugging information.
  • /help: Display help and description for command-line options.
  • /out: Write compiled output to specified file.
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