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Modular Design Patterns in Java

Modular Design Patterns in Java refer to the architectural approaches and structural paradigms used to decompose a Java application into distinct, manageable, and reusable modules^[100-InBox__java-Jigsaw.md].

Core Concepts

The primary goal of modular design in Java is to improve system architecture by separating concerns, which enhances maintainability and scalability^[100-InBox__java-Jigsaw.md].

Java Jigsaw

A foundational implementation of modular design in modern Java is the Java Platform Module System (JPMS), commonly known as Project Jigsaw^[100-InBox__java-Jigsaw.md].

This system introduces the concept of a "module"—a collection of packages, data, and resources along with a descriptor file that explicitly defines dependencies and exposes specific APIs^[100-InBox__java-Jigsaw.md]. This explicit structure allows for:

  • Strong Encapsulation: Modules can hide internal implementation details, exposing only necessary interfaces^[100-InBox__java-Jigsaw.md].
  • Reliable Configuration: The system verifies at startup that all required modules are present and that no circular dependencies exist^[100-InBox__java-Jigsaw.md].
  • Custom Runtime Images: Developers can create optimized application bundles containing only the specific modules required by the application^[100-InBox__java-Jigsaw.md].

Sources

^[100-InBox__java-Jigsaw.md]