[Ruby] - bar.rb require "foo" ... JRuby JIT Compiler in a nutshell by Hiroshi Nakamura | nahi@ruby-lang.org | @nahi [Ruby] - foo.rb "AA".unpack(...) jrubyc --java jrubyc [Java] - Foo.java String = "Ruby source" execute(String) javac or jrubyc --javac [Java bytecode] - Foo.class