Deepak is a Sun Certified Java Programmer and Web Component Developer, and has worked in the fields of XML, Java programming and Java EE for ten years. Deepak is the co-author of the Apress book Pro XML Development with Java Technology and was the technical reviewer for the O'Reilly book WebLogic: The Definitive Guide. Deepak was also the technical reviewer for the Course Technology PTR book Ruby Programming for the Absolute Beginner. Deepak is also the author of the Packt Publishing books JDBC 4.0 and Oracle JDeveloper for J2EE Development, Processing XML Documents with Oracle JDeveloper 11g, EJB 3.0 Database Persistence with Oracle Fusion Middleware 11g, and Java EE Development in Eclipse IDE. Deepak is a Docker Mentor and has published 5 books on Docker and Kubernetes.
Groovy's recent surge in usage (TIOBE index ranking from 26 to 12 between Feb. 2020 and Feb. 2021) could be attributed to the many benefits the language provides. Groovy, like Java, is compiled to JVM (Java Virtual Machine) bytecode.
Sealed classes are classes that permit only specific classes to extend them, as a result limiting extensibility. Sealed classes provide several benefits such as: additional modularization, could be used to develop internal classes, could be used to develop proprietary software.
Each new version of the OpenJDK (Java Developer Kit) includes some language features and some non-language JVM (Java Virtual Machine), core-libs, and other libs-related features. Here, we’ll discuss some of the non-language new features in the upcoming OpenJDK 15.