Java examples for Object Oriented Design:Module
Utilize the jar utility to package modules and to make executable modules.
To package a module, navigate to the directory which contains the module and src directories.
From within that directory, execute the following commands via the command line:
mkdir lib
jar --create --file=lib/org.firstModule@1.0.jar --module-version=1.0 --main-class=org.firstModule.Main -C mods/org.firstModule .
This utility will package the module into a JAR file within the lib directory.
The JAR file can then be executed with the java executable as follows:
java -p lib -m org.firstModule
The jar utility has been enhanced for Java 9 to include a number of new options.
The following table lists the options of the jar utility.
jar Utility Options
| Option | Description |
|---|---|
| -c, --create | Create an archive |
| -I, --generate-index=FILE | Generate index information for specified jar files |
| -t, --list | List an archive's table of contents |
| -u, --update | Update an existing jar file |
| -x, --extract | Extract one or more files from a jar file |
| -C DIR | Change to the directory that is specified and include file |
| -f, --file=FILE | Name of the jar file |
| -v, --verbose | Generate verbose output |
| -e, --main-class=NAME | The main class or entry point for a module that will be packaged into the jar |
| -m, --manifest=FILE | Include specified manifest file information with the jar |
| -M, --no-manifest | Omit manifest |
| --module-version=VERSION | Module version |
| --hash-modules=PATTERN | Compute and record hashes of modules matched by the specified pattern |
| -P, --module-path | Location of module dependency for generation of hash |
| -0, --no-compress | Specifies that no ZIP compression shall be used |