Java: Java Modules (JPMS)

Restricting access to module internals. Frame the concept in practical terms so you can explain it during interview discussion.

Strong encapsulation means that a module's internal packages are not accessible outside the module unless explicitly exported. This prevents accidental access to internal APIs and enforces module boundaries, reducing coupling. For example, an e-commerce module handling payments might only expose 'payments.api', keeping its processing logic private.