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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:
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:


<source lang="java"> /** @beanproperty */</source>
<syntaxhighlight lang="java"> /** @beanproperty */</syntaxhighlight>


…and change the corresponding private variable name to be different from the suffix of the getXxx/setXxx names{{Citation needed|date=February 2017}}.
…and change the corresponding private variable name to be different from the suffix of the getXxx/setXxx names{{Citation needed|date=February 2017}}.

Revision as of 17:58, 11 May 2020

Not to be confused with J or J++.
The correct title of this article is J#. The substitution of the # is due to technical restrictions.
Visual J#
ParadigmObject-oriented, structured, imperative
DeveloperMicrosoft
First appeared2002 (2002)
Stable release
v2.0 Second Edition / 18 May 2007; 17 years ago (2007-05-18)
Platform.NET Framework
Websitemsdn2.microsoft.com/en-us/vjsharp/default.aspx
Influenced by
Java and Visual J++

Visual J# (pronounced "jay-sharp") is an implementation of the J# programming language that was a transitional language for programmers of Java and Visual J++ languages, so they could use their existing knowledge and applications with the .NET Framework.[1][2] It was introduced in 2002 and discontinued in 2007, with support for the final release of the product continuing until October 2017.

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.[citation needed] It was developed by the Hyderabad-based Microsoft India Development Center at HITEC City in India.[3][4]

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[citation needed].

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).[citation needed]

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."[5]

Contrariwise, Microsoft documentation for Visual Studio 2005 details the definition of .NET delegates,[6] events,[7] and value types[8] directly in J#.

Future of J#

In January 2007, Microsoft announced:[9]

  • That Microsoft would produce an updated version of Visual J# 2.0, including a 64-bit redistributable version, called J# 2.0 Second Edition to meet customer demand for 64-bit runtime support. Microsoft released Visual J# 2.0 Second Edition in May 2007.[10]
  • Retirement of the J# language and Java Language Conversion Assistant from future versions of Visual Studio. The last version, shipping with Visual Studio 2005, was supported until 2015.
  • Calling J# code from .NET 4.0 code would fail unless vjsnativ.dll was pre-loaded.[11]

A link to download Visual J# 2005 Express Edition is no longer available from Microsoft's website

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 was discontinued on October 10, 2017.[13]

See also

References

  1. ^ "Visual J# Home". msdn.microsoft.com. Retrieved 2017-03-24.
  2. ^ "Java to .NET Framework Migration Workshop: Free Online Training". Archived from the original on 2008-04-23. Retrieved 2020-01-28.{{cite web}}: CS1 maint: bot: original URL status unknown (link)
  3. ^ S Prasanna, Microsoft's VJ#.Net is made in India, Express Computer, 29 July 2002 Archived 28 November 2013 at the Wayback Machine
  4. ^ "The Hindu Business Line : Microsoft lines up big plans for Hyderabad centre". www.thehindubusinessline.com.
  5. ^ Yager, Tom. "Just don't call J# Java". Retrieved 6 March 2017.
  6. ^ "delegate (Visual J#)". msdn.microsoft.com. Archived from the original on 2011-12-19. Retrieved 2017-03-24.
  7. ^ "Definition and Use of Events". msdn.microsoft.com. Retrieved 2017-03-24.
  8. ^ "User-Defined Value Types". msdn.microsoft.com. Retrieved 2017-03-24.
  9. ^ Microsoft Developer Network, Visual J# Product Announcement, 10 January 2007
  10. ^ "Visual J# 2.0 Second Edition Redistributable Download". Archived from the original on 2007-05-23. Retrieved 2010-04-27.{{cite web}}: CS1 maint: bot: original URL status unknown (link)
  11. ^ "Calling J# code from .NET 4.0 - Windward Wrocks". Retrieved 6 March 2017.
  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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