What are the different module types in Java 9?

Module system is a new feature introduced in Java 9. A module is a set of packages , divided into two types: exported packages and hidden packages . Export packages can be used outside this module. Hidden packages cannot be used outside this module; only the code of this module can use these packages.

There are four types of modules in Java 9, as follows:

• Application module: This module is used to implement Function. All Third Party dependencies fall into this category.
• Auto modules: Jars without module descriptors can be placed in modules in the module path. The main benefit of this module is the use of pre-Java 9 build jars.
Unnamed module:
• Any jar or class on the classpath belongs to an unnamed module. Since it doesn't have any name, it can read and export all modules.
Platform Modules:
• The JDK has been converted into a modular structure and these are called platform modules.

  <strong>module <Module-Name> {
     requires moduleName;
     exports packageName;
  }</strong>

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