What is module in java

Module in Java provides a modular mechanism to package code, data and resources into reusable units. Its advantages include: Modularity: Improves code maintainability. Loose coupling: Reduce dependencies between modules. Reusability: Facilitates code reuse. Encapsulation: Hide the internal implementation of the module. Flexibility: Allows flexible combination of code blocks.

Module in Java

Module Definition

Module is A new modularization mechanism introduced in Java 9 is a unit that packages related code, data, and resources together. By using Modules, you can create loosely coupled and reusable blocks of code, making your code more maintainable and extensible.

Advantages of Module

• Modularization: Organizing code into modules makes the code easier to understand and maintain.
• Loose coupling: Modules only need to rely on public APIs, reducing coupling.
• Reusability: Modules can be deployed and reused independently, improving the reusability of the code.
• Encapsulation: Modules can hide internal implementation details, improving code security.
• Flexibility: Modules allow developers to flexibly combine blocks of code as needed.

The structure of Module

Module is defined by the module-info.java file, which contains the following information:

• module name: The unique identifier of the Module.
• Dependencies: Other Modules that Module depends on.
• Public package: The package that Module exposes to other Modules.
• Export package: Module is exposed to all Module packages.

Using Module

To use Module, you need to follow these steps:

1. Create a new Module project.
2. Create a module-info.java file in the project and define Module information.
3. Organize code into corresponding packages.
4. Use the requires statement to declare Module's dependencies.
5. Use the exports or opens statement to expose the Module package.
6. Compile and run your Module.

Example Module

The following is a simple Java Module example:

// module-info.java
module com.example.module {
    // 依赖项
    requires java.base;
    
    // 公开包
    exports com.example.module.api;
}

This Module depends on the Java base module and exposes the name Package for com.example.module.api.

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