Visual J Sharp

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). InfoWorld 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." Contrariwise, Microsoft documentation for Visual Studio 2005 details the definition of .NET delegates, events, and value types directly in J#. Like C# and unlike Java, J# is able to use the C preprocessor directives. ==History of J#==

In January 2007, Microsoft announced: • 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. • 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. The download of Visual J# 2005 Express Edition is no longer available from Microsoft's website. Visual J# is out of support including the Visual J# 2.0 Redistributable Second Edition released in 2007, that was supported through to 2017 "(5 years mainstream and 5 years extended support) on EN-US locales." == Example ==

The following is a simple example of Visual J#. package Wikipedia.Examples; import System.*; import System.ComponentModel.Container; import System.Drawing.Point; import System.Drawing.Size; import System.Windows.Forms.Application; import System.Windows.Forms.Button; import System.Windows.Forms.Form; import System.Windows.Forms.Label; import System.Windows.Forms.TextBox; public class HelloWorld extends Form { private TextBox textBox; private Button button; private Label label; private Container components = null; public HelloWorld() { InitializeComponent(); } protected void Dispose(boolean disposing) { if (disposing) { components.Dispose(); } super.Dispose(disposing); } private void onClick(Object sender, EventArgs e) { label.set_Text(String.Format("Inputted text: {0}", textBox.get_Text()); } #region Windows Form Designer generated code private void InitializeComponent() { this.textBox = new TextBox(); this.button = new Button(); this.label = new Label(); this.SuspendLayout(); // initialise text box textBox.set_Location(new Point(50, 30)); textBox.set_Name("Hello world!"); textBox.set_Size(new Size(120, 20)); // initialise button button.set_Location(new Point(50, 60)); button.set_Name("button"); button.set_Text("Click me!"); button.add_Click(new EventHandler(this.onClick)); // initialise label label.set_Location(new Point(50, 90)); label.set_Name("label"); label.set_Size(new Size(200, 20)); // initialise form set_AutoScaleBaseSize(new Size(6, 15)); set_ClientSize(new Size(220, 140)); get_Controls().Add(textBox); get_Controls().Add(button); get_Controls().Add(label); set_Name("form"); set_Text("Hello, world!"); ResumeLayout(false); } #endregion /** @attribute System.STAThread() */ public static void main(String[] args) { Application.Run(new HelloWorld()); } } ==See also==