Jython load Java class

cd examples/mymath/
java -jar ~/jython2.7.0/jython.jar
Jython 2.7.0 (default:9987c746f838, Apr 29 2015, 02:25:11)
[Java HotSpot(TM) 64-Bit Server VM (Oracle Corporation)] on java1.8.0_60
Type "help", "copyright", "credits" or "license" for more information.
>>> import Calculator
>>> Calculator.add(2, 3)
5
>>> Calculator.add(10, 3)
10
>>>