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How can we modify an existing module in Java 9?
The module is a named, self-describing collection of code and data. The code has been organized as a set of packages containing types like Java classes and interfaces. The data includes resources and other kinds of static information. We need to declare a module then add module-info.java at the root of the source code.
Below is the template of the "module-info.java" file.
module <module-name> {
requires <module-name1> ;
requires <module-name2>;
exports <package-name1>;
exports <package-name2>;
exports <package-name> to <module-name>
}We can use certain command-line options that help us to modify existing modules and add dependencies to them, export additional packages.
Below are the few command-line commands that can be used to modify an existing module.
1) --add-reads <module>=<target-module>(,<target-module>)*
The above command can update <module> to read < target-module>, regardless of the module declaration. <target-module> can be ALL-UNNAMED to read all nameless modules.
2) --add-exports <module>/<package>=<target-module>(,<target-module>)*
The above command can update <module> to export <package> to <target-module>, regardless of the module declaration. <target-module> can be ALL-UNNAMED to export to all nameless modules.
3) --add-opens <module>/<package>=<target-module>(,<target-module>)*
The above command update <module> to open <package> to <target-module>, regardless of the module declaration.
4) --patch-module <module>=<file>(;<file>)*
The above command can replace or increase a module with classes and resources in jar files or directories.
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