J Sharp

Visual J#
Paradigm Object-oriented, structured, imperative
Developer Microsoft
First appeared 2002 (2002)
Stable release
v2.0 Second Edition / 18 May 2007 (2007-05-18)
Platform .NET Framework
Website msdn2.microsoft.com/en-us/vjsharp/default.aspx
Influenced by
Java and Visual J++

Visual J# (pronounced "jay-sharp") programming language was a transitional language for programmers of Java and Visual J++ languages, so they could use their existing knowledge and applications on .NET Framework.[1]

J# worked with Java bytecode as well as source so it could be used to transition applications that used third-party libraries even if their original source code was unavailable. It was developed by the Hyderabad-based Microsoft India Development Center at HITEC City in India.[2][3]

Fundamental differences between J# and Java

Java and J# use the same general syntax but there are non-Java conventions in J# to support the .NET environment. For example, to use .NET "properties" with a standard JavaBean class, it is necessary to prefix getter and setter methods with the Javadoc-like annotation:

	/** @beanproperty	 */

…and change the corresponding private variable name to be different from the suffix of the getXxx/setXxx names.

J# does not compile Java-language source code to Java bytecode (.class files), and does not support Java applet development or the ability to host applets directly in a web browser, although it does provide a wrapper called Microsoft J# Browser Controls for hosting them as ActiveX objects. Finally, Java Native Interface (JNI) and Raw Native Interface (RNI) are substituted with P/Invoke; J# does not support Remote Method Invocation (RMI). .

JavaWorld said: "J#'s interface to the .NET framework is solid, but not as seamless as C#. In particular, J# code cannot define new .NET attributes, events, value types, or delegates. J# can make use of these language constructs if they are defined in an assembly written in another language, but its inability to define new ones limits J#'s reach and interoperability compared to other .NET languages."[4]

Contrariwise, Microsoft documentation for Visual Studio 2005, details the definition of .NET delegates,[5] events,[6] and value types[7] directly in J#.

Future of J#

In January 2007, Microsoft announced:[8]

A link to download Visual J# 2005 Express Edition is no longer available from Microsoft's website; however, the link which was previously available was still functional as of 2017.[11]

Visual J# is out of mainstream support but "Visual J# 2.0 Redistributable Second Edition released in 2007, with support continuing through to 2017 (5 years mainstream and 5 years extended support) on EN-US locales."[12] Support for the Visual J# Version 2.0 Redistributable Package Second Edition will be discontinued from October 10, 2017.[13]

See also

References

  1. ↑ "Visual J# Home". msdn.microsoft.com. Retrieved 2017-03-24.
  2. ↑ S Prasanna, Microsoft's VJ#.Net is made in India, Express Computer, 29 July 2002 – invalid link !
  3. ↑ "The Hindu Business Line : Microsoft lines up big plans for Hyderabad centre". www.thehindubusinessline.com.
  4. ↑ Yager, Tom. "Just don't call J# Java". Retrieved 6 March 2017.
  5. ↑ "delegate (Visual J#)". msdn.microsoft.com. Retrieved 2017-03-24.
  6. ↑ "Definition and Use of Events". msdn.microsoft.com. Retrieved 2017-03-24.
  7. ↑ "User-Defined Value Types". msdn.microsoft.com. Retrieved 2017-03-24.
  8. ↑ Microsoft Developer Network, Visual J# Product Announcement, 10 January 2007
  9. ↑ Visual J# 2.0 Second Edition Redistributable Download, Microsoft Download Center
  10. ↑ "Calling J# code from .NET 4.0 - Windward Wrocks". Retrieved 6 March 2017.
  11. ↑ Visual J# 2005 Express Edition
  12. ↑ "Visual J# Home". Retrieved 6 March 2017.
  13. ↑ "End of Support for Visual Studio 2008 – in One Year". Retrieved 2017-04-11.
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