Java 9 is a major release. It may seem to be a maintenance release that pushes forward project Jigsaw Project (Module System). But along with the new module system and a number of internal changes associated with it Java 9
Java 8 is the greatest release in the Java world since Java 5. It brings lots of new features to the Java as a
language, its compiler, libraries, tools and the JVM (Java virtual machine) itself.