Java 9 version introduces new enhancements and adds new features. It includes JShell, Http2Client, Java Platform Module System (JPMS), multi-version jar files, >Stack Walking API , Private methods in interfaces , Process API updates , Collection API updates , Stream API improvements etc.
Here are some differences between Java 8 and Java 9
- In Java 8 and earlier, the top-level component is the package. It puts a set of related types (classes, interfaces, enumerations, etc.) into a group and also contains a set of resources, and Java 9 introduces a new component: modules, which can be used to put a set of related packages into a group , there is another new component: Module descriptor, module-info.java file.
- Java 8 applications use packages as top-level components, while Java 9 applications use modules as top-level components.
- Each Java 9 module has only one module with a module descriptor, while Java 8 packages do not build multiple modules into a single module.
Java 8:
<strong>Packages - Types (classes, enums, interfaces, etc) - Code - Data - Resources - xml - images - properties</strong>
Java 9:
<strong>Modules (Resources, Module Descriptor)</strong> <strong> - Packages - Types (classes, enums, interfaces, etc) - Code - Data - Resources - xml - images - properties</strong>
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