Java FAQ: Top Questions

33. What is the Java Module System?

The Java Module System , introduced in Java 9 (JPMS, Jigsaw), organizes code into modules for better encapsulation, scalability, and maintainability.

Module: A group of packages defined in module-info.java .
Directives: exports (exposes packages), requires (depends on modules), uses , provides .
Encapsulation: Hides internal packages, exposing only exported ones.
Benefits: Smaller runtime (jlink), improved security, clearer dependencies.
Use Case: Large applications or custom runtimes.

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