Explore the Groovy GDK (Groovy Development Kit) with 14 tested examples. Learn how Groovy extends JDK classes like String, List, Map, File, Object, and Number with hundreds of convenient methods. “The GDK is why Java developers fall in love with Groovy – it takes the classes you already know and adds the methods you always wished they had.” Dierk König, Groovy in Action Last Updated: March 2026 | Tested on: Groovy 5.x, Java 17+ | Difficulty: Beginner | Reading Time: ... Read More