Java/Scripting/JRuby

Working With JRuby

 
import java.io.BufferedReader;
import java.io.FileReader;
import javax.script.Invocable;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
public class MainClass {
  public static void main(String[] args) throws Exception {
    ScriptEngineManager manager = new ScriptEngineManager();
    ScriptEngine engine = manager.getEngineByName("jruby");
    engine.eval(new BufferedReader(new FileReader("r.rb")));
    Invocable invocable = (Invocable) engine;
    Object tempconverter = invocable.invokeFunction("getTempConverter");
    double degreesCelsius = (Double) invocable.invokeMethod(tempconverter, "f2c", 98.6);
    System.out.println(degreesCelsius);
    double degreesFahrenheit = (Double) invocable.invokeMethod(tempconverter, "c2f",100.0);
    System.out.println(degreesFahrenheit);
  }
}
//////////////
# TempConverter.rb
class TempConverter
  def c2f(degrees)
    degrees*9.0/5.0+32
  end
  def f2c(degrees)
    (degrees-32)*5.0/9.0
  end
end
def getTempConverter
  TempConverter.new
end