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In Java we have package, jar concepts to achieve modular programming. Why Java 9 introduced "Modules" again . What is the difference between these concepts . Looks like , just Python/Node.js and other languages has this module and Java simply follows the same path.

JavaUser
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  • [This](https://www.oracle.com/corporate/features/understanding-java-9-modules.html) article may shed some light. Have you seen it already? – Federico klez Culloca May 07 '18 at 10:58
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    JARs don't really provide modular programming, it's more about packaging code. E.g., you cannot make only a part of a JAR public - if you add a JAR to classpath, all its classes become visible to the application. Modules address this issue. Another big point is the dependencies - a module declares/defines its dependencies (incl. dependencies to the modules of the JRE itself) while a JAR doesn't. – Alex Shesterov May 07 '18 at 11:01

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