The .jar file is at this point essentially only the product of one currently maintained software package, which also happens to be a complete programming language under which entirely new software can be created! Within java, anything from fully three dimensional game to a simple chat interface can be not only manifested but transmitted online as well. A .jar file can itself represent the entirety of such a program in a small package, often used on mobile devices. Sometimes this program is called an applet. These files actually use a form of compression, making them smaller, more portable, and easier to transmit across a network.
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While in its original form, a .jar file may seem like a single object, it really contains multiple objects or files which can be extracted. To extract these files for individual manipulation is actually easier than you might have assumed. Almost everyone has heard of the .zip file format; it is the most popular archival and compression software available for the Microsoft Windows OS. If you have a program that can extract this common file type then you can use the same program to decompress and extract the archive contained within a .jar file. If you don't yet have such software installed on your machine, you'll be happy to know that many different programs are available which will accomplish this task equally well for free download on the internet. A quick Google search for "zip file extract freeware" will yield you many acceptable results. Interestingly though, most of these programs will not automatically recognize that they can be extracted, and if you try to open a .jar file directly with extracting software you will likely receive an error about it being an unrecognized file format. To avoid this, simply rename the .jar file you are using to a .zip. It may be a good idea to make a backup of the original file, just in case you are inexperienced and make some sort of mistake.
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More Info Regarding File Extension Jar
While .zip and .jar files may use the same compression and formatting technique, the distinction between the two extensions is made not just as an identifier for the language associated with it, but because alongside static files like text or images that are found within a .jar archive are also, generally speaking, executable files or source code also reside. This data is essentially the 'meat' of the program, which is dynamic in the sense that if performs a function or interacts with the user. If it is this functionality you are trying to get to, you're going to need to download install what is called the "Java Runtime Environment." This contains the information and variables needed to turn the executable data into usable software, and is available for free at the Java website.
For the sake of being accurate and keeping all possibilities covered, there are two rather obsolete programs which also use this extension and must be mentioned. One is called the JARCS compressed archive, published and maintained while it was still active by JPMdL Archival Systems. The other is called simply Jar Archive, and was a compression and archival format similar to but less popular than .zip and others. It was offered in both Microsoft DOS and 32 bit Windows operating systems.
So, expect to come across .jar files when dealing with web applications. Often they are stored temporarily in various folders on your computer's disk, depending on what software you are using. If you suspect you are dealing with a Java archive file with the extension of .jar, if you'd like to avoid the task of downloading and installing the Java Runtime environment and are just trying to get at static data within the archive, you can always get at the contents with a .zip extractor, but remember, you won't be able to run the program that may be contained within. Since Java is so widespread and often used in all facets of computing, online and offline alike, it may be in your best interests to go ahead and install it anyway.
Should you run into trouble accessing a .jar file and its source is questionable, ensure that it isn't corrupted by getting a different copy from a separate location. It's so unlikely that you'll be dealing with the two programs mentioned at the end that if you're having trouble with a .jar using an extractor, the file is likely corrupted. For more specific support in using Java as a language and compiling your own programs, there is a vast online community of fellow programmers online waiting to help.
