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J++ or Visual J++

This is Microsoft's answer to Java and Sun. This is one of the many IDE (Interactive Development Environment) languages that work together within a total environment by Microsoft. They intend for the world to use Microsoft products happily ever after, both on and off the Internet. Visual J++ with JScript is a very powerful tool for creation of imaginative Web sites. Some of the components in the environment are J++, Visual Interdev, ActiveX, Visual Basic, Visual C++, Developer Studio, Image Composer, FrontPage, Internet Explorer, NT Server, NT Client, Windows 95, Site Server, BackOffice, SQL, Personal Server, Visual FoxPro, Publisher, Word, Excel, Access and other Office components. There are more every day. The modification of JAVA is the reason they have lost a first round law suit with Sun.

J# or Visual J#

This is Microsoft's newest answer to Java and Sun, following the pattern of J++. They intend for the world to use Microsoft products happily ever after, both on and off the Internet. Visual J# (sometimes known as just J#) is a set of programming tools that allow developers to use the Java programming language to write applications that will run on Microsoft's .NET runtime platform. While Microsoft does not support the Java Virtual Machine as part of .NET, Visual J# allows a programmer familiar with or who prefers Java's concepts and language syntax to write and compile a program that will run successfully on the .NET Framework Common Language Runtime platform. The source statements are compiled into Microsoft Intermediate Language (MSIL), which is the equivalent of Java bytecode. A program already compiled into Java bytecode can be converted into MSIL. With Visual J#, Microsoft includes their own class libraries that are the equivalent of the Java Development Kit level 1.1.4 class libraries. Visual J# supports the functionality of Visual J++ and Microsoft extensions. For Visual J++ users, Microsoft says that Visual J# presents a familiar interface and both development systems and project files can be used on the same machine. A source file written in Visual J# will by default have the file namesuffix .jsl.


Just Kidding. An example of online shorthand commonly used in chatrooms, E-Mail and instant messages. This often comes after you have just crashed due to a virus handed down in some sort of communication. You seldom get to see it.

jack in

To log in to a machine or connect to a network. Derived from cyberpunk fiction, insinuating to steal or hijack.


1. Java is platform independent object-oriented programming language. Originally developed as 'OAK' by Sun Microsystems's Green Project in 1991, Java is superficially very similar to C++, but is unique in many ways. Java interpreters have been ported to every viable computing platform in existence. This is an aid to determine if Java in your browser is enabled.
2. Java is an object oriented programming language created by Sun Microsystems. If you are using a web browser that supports Java, an applet (Java program) embedded in the Web page will automatically run. Currently, many proprietary ISP browsers do not support Java. Like HTML, there are many variations. There is a war at present for the control of the standards of Java; Microsoft is at war with the Java community and the outcome of that scenario has been decided in a court, at least the first round, rather than by technology. At the point it is finally decided, the technology will be outdated and of no interest to anyone. As of now, Microsoft has to rebuild JAVA so that it is independent of platforms. There are many Java like dialects and most current generation browsers support the majority of them.
3. Java is a device independent language, meaning that programs compiled in Java can be run on any computer. Java programs can be run as a free-standing application or as an applet placed on a web page. Applets written in Java are served from a web site but executed on the client computer. Java applets have a built-in security feature which prevents them from accessing the file system of the client computer. See also applet.
Here is the Java version of "Hello World!":
class HelloWorld {public static void main (String args[])
{System.out.println("Hello World!");}}

Java Bean

A Java bean is a Java class that follows specific conventions, called a component model, making it simple to connect beans (classes) together with minimum effort. Among other advantages, beans provide a bridge between Java and ActiveX. See Java.


A scripting language that allows lines of Java code to be inserted into HTML pages. See Java. The main difference between these two computer language variations is that JavaScript functions within the Java enabled web browser (a client-side application) while Java programs function outside of the browser as a stand alone program (a server-side initiated application but seen within a browser, when on the Internet), using its own specific file types. Don't let this very thin difference confuse you, though. The latest versions of modern browsers have Java runtime engines built into them so that Java applets can play (by being invoked or called) within the browser window, similarly to how a browser plug-in works. But even though a web browser can run a Java applet within its window, it doesn't hold all of the code for the applet in the HTML page, the way that a JavaScript works. A Java applet only includes bits of code within the HTML source to call functions and libraries that reside outside of the HTML source. While more "secure" as far as source code, it take considerably more execution time. Conversely, all of the JavaScript code is contained in the HTML of the page where the JavaScript executes. What this distinction means to web page designers is that JavaScripts function much more quickly than Java applets. See some of our own Javascripts in use on our menu of Calculators, Converters and Tables including a sample problem, resolved by a JavaScript program. You can keep and use the sample program code that resolves the problem. It is well documented and a good way to learn some programming in JS.


An acronym for the Joint Electronic Devices Engineering Council. An international body of semiconductor manufacturers that set integrated circuit (IC) standards.


An acronym for the Job Control Language. This script language was originated by IBM for the mainframe world of the 1960s and later. Variations of it became DOS' batch operations (.bat files) and became parts of languages such as C for UNIX, PERL and many more. JCL is an ASCII file with each command on a line terminated with a line feed and carriage return. A recent spinoff similarity is PJL, created by HP.


An acronym for the Java Development Kit, a programming environment from Sun Microsystems, in reality, a type of SDK.


A new project from Sun Microsystems that allows instant connectivity of devices within computers and networks. The technology is in Beta now and due for release in late 1999 or within 2000. The software for this project is written in Java, also from Sun, for total portability. See Java.


Interference on an analog line caused by a variation of a signal from its reference timing slots. Jitter can cause problems in the receipt of data and any subsequent processing of that data.

Joint Photographic Experts Group - JPEG



An image compression standard for still photographs that is commonly used on the web. This is the pronunciation; the exact extension is .JPG.


A type of calendar numbering system that does not use months or years as the foundation for advancement. Each day since the beginning of time is assigned a number and increments by one each day thereafter. In most computerized accounting systems, a current date is converted to Julian to track the number of days between dates. It is used in the calculations of late charges, and similar circumstances. You can use our Julian calculator if you would like to try that. Click here to see our menu of Calculators, Converters and Tables.


1. An electrical connection.
2. The place where two different pieces of semi-conductor material join. The junctions are usually called NP or PN depending on the designed flow of electricity, because of the types of semi-conductor materials, N-type and P-type. This special junction is what makes the right configuration of semi-conductors work as a transistor or a diode.

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