JRuby Reference

require 'path/to/file.jar'

require can take a path to a jar file. It searches the JRuby $LOAD_PATH for the file.

require 'java'

A special `require 'java'` directive in your file will give you access to any bundled Java libraries (classes within your java class path). However, this will not give you access to any non-bundled libraries.

#each

JRuby supports calling the `#each` method on Enumerable objects

Name translations

Java: org.foo.department.Widget

Ruby: Java::OrgFooDepartment::Widget