This is an useful tutorial through which you can learn about the JRuby language. JRuby is a pure Java implementation of the Ruby interpreter. In this tutorial the author explains various features of the JRuby such as blocks and iterators, class structure, rules for naming variables etc., The author also shows you how to write a simple program using JRuby which displays the message "Hello World". In this tutorial you can find the sample program for building the calculator application using JRuby language. | 
