Now you can bring the best of into the world of Java, with Using JRuby. Come to the source for the JRuby core team's insights and insider tips. You'll learn how to call objects seamlessly from Ruby, and deal with Java idioms such as interfaces and overloaded functions. Run Ruby code from Java, and make a Java program scriptable in Ruby. See how to compile Ruby into .class files that are callable from Java, Scala, Clojure, or any other JVM language.