| Word | Description |
| J2EE | Java 2 Enterprise Edition. A development environment which is independent of hardware systems and operating systems. The idea is that software developers need only write applications once and these applications can then be run unchanged on any computer or operating system. |
| J2SE | Java 2 Standard Edition. A Java-based, runtime platform that provides many features for developing Web-based Java applications, including database access (JDBC API), CORBA interface technology, and security for both local network and Internet use. J2SE is the core Java technology platform and is a competitor to the Microsoft .NET Framework. |
| Java | Object oriented programming language developed by Sun Microsystems, designed for platform independence and frequently described as "write once run anywhere" language. Sun Microsystems describe Java as "A simple, object-oriented, distributed, interpreted, robust, secure, architecture neutral, portable, high-performance, multithreaded and dynamic language." |
| Javabeans | An object-oriented API created by Sun Microsystems for developers to create re-useable Java applications or components. |
| JavaScript | A scripting language that is usually run in a viewer's browser. JavaScript is used to create dynamic web pages (i.e. pages that change in some way when viewed in a browser), such as image rollovers and menus. JavaScript was originally developed by Netscape, and is now supported by all major browsers. JavaScript has a similar language syntax to both Java and C. |
| JBOD | Just a Bunch Of Disks, or Just a Bunch of Drives. JBOD is a collection of two or more disks in a system which are managed individually and do not form part of a RAID. (Although disks which are physically part of a RAID but are not configured as part of the array and accessed as separate individual disks would still be included as JBOD.) Unlike a RAID, JBOD provides no performance or fault tolerance benefits. |
| JDK | Java Development Kit. Included as part of J2SE. |
| Joystick | A joystick is an input device commonly used to control video games. Joysticks consist of a base and a stick that can be moved in any direction. The stick can be moved slowly or quickly and in different amounts. Some joysticks have sticks that can also be rotated to the left or right. Because of the flexible movements a joystick allows, it can provide much greater control than the keys on a keyboard. Joysticks typically include several buttons as well. Most joysticks have at least one button on the top of the stick and another button in the front of the stick for the trigger. Many joysticks also include other buttons on the base that can be pressed using the hand that is not guiding the stick. Joysticks typically connect to your computer using a basic USB or serial port connection and often come with software that allows you to assign the function of each button. Since joysticks emulate the controls of planes and other aircraft, they are best suited for flight simulators and flying action games. However, some gamers like to use joysticks for other types of video games, such as first-person shooters and fighting games. Others prefer using the basic keyboard and mouse, with which they are already accustomed to. |
| JPEG | Joint Photographic Experts Group. JPEG represents a compressed image file. The JPEG compression algorithm allows a compromise between final file size and the amount of information which is lost in the compression process. (JPEG is therefore a lossy compressed file.) Be aware that if a JPEG file is opened and re-saved then yet more ... be lost. A JPEG file is normally denoted with either a ".jpeg" or ".jpg" file extension. See also JFIF, JPG. |
| JPG | Abbreviation for Joint Photographic Experts Group. See JPEG for details. |
| JRE | Java Runtime Environment. The JRE contains libraries, java virtual machine and other resources required to enable java applications and applets to run. |
| JS | Abbreviation for JavaScript. cf JavaScript. |
| JSON | JavaScript Object Notation. JASON is a format for exchanging data between systems. It is a text based format (and so human readable), and uses simple data structures and associative arrays. It has been suggested that JASON is more efficient (although perhaps less versatile) than XML. Since both file types require some processing, which is the most suitable or the most efficient should be considered on a per application basis. JSON files require less processing to parse than XML files, and for some applications can be smaller than the XML equivalents. JSON is supported natively by JavaScript and for JavaScript based solutions JSON is therefore a very efficient means of data exchange. JSON files normally use the .json file extension. |
| JSP | Stands for "Java Server Page." This standard was developed by Sun Microsystems as an alternative to Microsoft's active server page (ASP) technology. JSP pages are similar to ASP pages in that they are compiled on the server, rather than in a user's Web browser. After all, they don't call them "server pages" for nothing. However, JSP is Java-based, whereas ASP is Visual Basic-based. JSP pages are useful for building dynamic Web sites and accessing database information on a Web server. Though JSP pages may have Java interspersed with HTML, all the Java code is parsed on the server. Therefore, once the page gets to the browser, it is only HTML. JavaScript, on the other hand, is usually parsed by the Web browser, not the Web server. |
| Jumper | his is a small metal connector that acts as an on/off switch and is used to alter hardware configurations. A jumper is typically made of two wires and a small piece of metal. When the wires are connected by the metal piece, the jumper is turned on, completing the circuit. When the wires are disconnected, the jumper is turned off. Mulitple jumpers, referred to collectively as a jumper block, are often used to tell the computer how a certain device, such as a hard drive or a modem, is configured. They can be found on motherboards, sound cards, graphics cards, I/O cards, CD-ROM interface boards, modems, and hard drive controller boards, and others. Manually setting jumpers can be a confusing process, so most hardware usually comes with the necessary jumpers preset. If they are not preset, there should be documentation with a clear diagram of the jumper settings included with the hardware. Fortunately, a lot of plug-and-play equipment available today does not require any jumpers. These devices can be configured through a user-friendly interface on your computer. |
| Juniper | Produces high speed, reliable switching routers to satisfy ISP level performance |
| Juniper Networks (Juniper) | Juniper Networks, Inc. (NYSE:JNPR) is an information technology and computer networking products multinational company, founded in 1996. It is headquartered in Sunnyvale, California, USA. The company designs and sells high-performance Internet Protocol network products and services. Juniper's products include T-series, M-series, E-series, MX-series, and J-series families of routers, EX-series Ethernet switches, WX-series WAN optimization devices, and SRC Session and Resource Control appliances. JUNOS , Juniper's network operating system runs on most of the Juniper products |
| justified | A word processing format in which text is formatted flush with both the left and right margins. Other options include left justified (text is lined up against the left margin) and right justified (text is lined up against the right margin). |
| JVM | Java Virtual Machine. The Java Virtual Machine runs compiled Java byte code. This enables a Java application to run on any operating system for which the JVM has been implemented. |
