Top 10 Differences between java8 and java9

 Top 10 Differences Between Java8 and Java9 

Feature	Java 8	Java 9
Modularization	No module system	Introduced the Java Platform Module System (JPMS)
JShell	Not available	Introduced a REPL (Read-Eval-Print Loop) tool called JShell
Multi-release JARs	Not available	Introduced the ability to include multiple versions of a class in a JAR file
Collections API improvements	Added the Stream API, default methods in interfaces, and other improvements to the Collections API	Added convenience factory methods for creating immutable lists, sets, and maps
Private interface methods	Not available	Introduced the ability to declare private methods in interfaces
Deprecated and removed features	Several features were deprecated but not removed	Deprecated several features and removed some, such as the Applet API
HTTP/2 support	Not available	Added support for the HTTP/2 protocol
Process API improvements	Limited process control through the Process and Process Builder classes	Added new classes and methods for more comprehensive process management
Try-with-resources improvements	Added support for multiple resources in a single try statement	Added the ability to declare a resource outside of the try-with-resources statement
Performance improvements	Some performance improvements, particularly in the Stream API	Significant performance improvements in the JVM, including better garbage collection and JIT compilation