Version Release Is One Of The Important Phases Of Success Of Any Programming Language. Over The Years, Java Had Made Many Improvements In Its Api To Make It Reliable And Flexible To Use. This Book Aims At Providing You Information Related To All The Updates From Jdk9.0 To Jdk13.0 In One Place. \nThis Book Starts With A Brief History Of Java. It Covers How Java Has Evolved As A Complete Programming Language Over The Years By Launching Different Versions. You Will Learn The Concept Of A Module System And Other Important Concepts Introduced In Jse9 .0 And Jse10.0. Moving Ahead, The Book Will Take You Through Updates In Jdk11.0. Concepts Like Epsilon, Zgc, And Nest-based Access Control Have Also Been Discussed. \nThough The Version Updates Are Good To Learn, They Create Complexities In Updating The Existing Code To Make It Compatible With The New Version. This Book Talks In Detail About How You Can Migrate Your Legacy Code To Match Up With The New Versions. It Also Covers How To Use Jshell, A Tool Used To Test Your Code Snippet Without Writing The Complete Application Class, With Numerous Examples. Further, This Book Covers In Detail The Concept Of Reactive Programming. Concepts Like Publisher, Subscriber, Subscription, And Back-pressure Have Been Discussed With Examples. \nAt The End Of The Book, You Will Learn About The Very Recent Updates Which Have Been Released By Java. The Chapters Talk About Jdk12.0 And Jdk13.0. They Cover Concepts Like Shenondaoh, Microbenchmark Suit, Modified Switch Expression From Jdk12.0. Though Java13 Is Still A Hot-plated Dish, This Book Gives You A Fair Idea About What Are The New Updates Which Have Been Proposed In This Version.