class" files of the current directory and the entire " images" sub-directory into " hello.jar". The name may contain wildcard '*'.įor example, suppose that " images" is an sub-directory under the current directory, the following command jar-up all the ". inputFileDir give the input filenames or directory names for the files to be jarred.'f' specifies that the output go to a file specified in jarfile (instead of the standard output by default).'v' option asks for verbose mode, which displays information messages.'c' option indicates that you want to create a new JAR file.> jar cvf jarFile inputFileDir1 inputFileDir2. To create a JAR file using the jar tool, issue the jar command (on CMD shell) with 'c' option: In practice, you should use your IDE (such as Eclipse/NetBeans) to create JAR file instead (which are presented in the following sections). Create JAR File using Command-Line "jar" ToolĬreating JAR file using command-line jar tool is clumpy! It is presented here for your basic understanding and completeness. Needless to say, using IDE to create a JAR file is much more easier than the command-line jar tool. Via the "export" option of IDE such as Eclipse or NetBeans, in practice.Via the command-line jar tool: JDK provides a command-line tool called " jar.exe", to create, manage and manipulate JAR files.There are a few ways that you can create a JAR file: Furthermore, the JAR files use the same file format as ZIP files, and can be opened and manipulated via ZIP programs such as WinZIP or WinRAR. The Java Runtime (JRE) (or Java applications) can load classes from the JAR file directly, without un-jarring the file. You can authenticate the author of the JAR file by checking the signature and the author's digital certificate.
Authentication: JAR file can be digitally signed by its author.Furthermore, transfer one big file over the network instead of many small files is faster and more efficient because it involves less overhead. Ease in distribution: All files in a Java package can be placed in a single file to facilitate distribution.Data compression (using the ZIP algorithm).JAR files provide the following functions: JAR is based on the popular ZIP algorithm, and mimic the Unix's tar (or tape archive) file format (e.g., jar and tar tools have the same command-line options). Java Archive (JAR) is a platform-independent file format that allow you to compress and bundle multiple files associated with a Java application, applet, or WebStart application into a single file.
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