The Java Platform Module System (JPMS) is a code-level structure, so it doesn’t change the fact that we package Java into JAR files. Ultimately, everything is still bundled together in JAR files.

Java 9 Platform Module System (JPMS) introduces the concept of named 'module'. 从Java9版本开始, 引入了模块系统，英文名称为 Java 9 Platform Module System，简称JPMS，其中最核心的概念就是 module, 中文称为“模块”。 Similar to Java packages, ...

Kotlin 1.2’s standard library is compatible with newly introduced Java 9 module system, which forbids split packages (multiple .jar files declaring classes in the same package).