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expressions commonly used by computer-users.
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Words in our glossary starting with "J" ...
Programming language and environment developed by Sun, in particular for Internet applications used on webpages. The advantage of Java is that it can be used independend of the underlaying operating system (a Java Virtual Machine is required though!).
Java Servlet (Servlets)
This is a Java application that is designed to execute on a webserver instead of on the client's computer. Servlets can be used in the same way that CGI programs can, to move data between a client and the webserver. One could, on a functional level, compare it with CGI and ISAPI.
This is an object-oriented API created by Sun Microsystems for developers to create re-usable Java applications or components.
A simple scripting language designed by Netscape to be embedded into HTML documents. It is unrelated to Java.
JBOD (Just a Bunch Of Disks)
This is two or more disk drives that form a single volume. However, the information on these disks is not striped in any way or protected. A JBOD is not a RAID. It's usually the RAID leftovers, and the term JBOD can be used to refer to a single drive.
This is an initiative developed by Sun Microsystems that allows for spontaneous communication and information sharing over a network.
(Just-In-Time) Compiler ? A compiler for the Java language that allows interpreted Java programs to be automatically compiled into native machine language on the fly, for faster performance of the program. Some JVMs include a JIT compiler.
Joint Stereo (an encoding option in the MPEG standard) looks at the two, stereo, channels and eliminates everything that is exactly identical.
it is a mathematical trick to change left/right into mid/side, and which saves space, and it also eliminates things that sound identical on both channels (mid vs side rather than left vs right in this case, though). It also checks to make sure that using this method for each tiny chunk of the song (called frames) is better than the simple left-right method. There are times when left-right will sound better than mid-side, and so for these frames, a good Joint Stereo implementation will allow left-right frames to be used.
This is an input device first found on arcade game machines, then home game systems, and finally on computers. It consists of any stick-like object that can be moved in four or more directions. Usually, there's a button in the vicinity of the joystick. Joysticks come in many shapes and sizes, but lately they have been replaced by cheap button pads in home gaming systems.
JPEG (Joint Photographic Experts Group)
A compression technique for images. The compression is NOT lossless - ie. Some information get's lost - although not visible for the human eye.
JSP (Java Server Page)
This is a specification that uses Java Servlets run on the webserver to generate Web pages that feature dynamic content. JSP is freely available and a competitor to Microsoft's ASP.
A jumper fits on two metal connectors. It provides an electrical connection between the two wires to enable a semi-permanent hardware configuration. Using jumpers, the users can make the devices act in different ways. See also dipswitch.
JVM (Java Virtual Machine)
This is a program that runs under an operating system and interprets Java programs. The Java Virtual Machine ideally will not allow any harm to come to the computer because it has no control of the operating system, and acts as if it is a separate computer. Another advantage of this mechanism is that different OS's can have their own Java Virtual Machines that should act identically. Thus, Java should be able to be run across different platforms easily with no code changes.
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