add java3_Lesson04
add MySuperClass
add MySubClass
shadow i
add addToI method
hide addToI method in MySubClass
call addToI in super class
chain constructor call
add empty constructor
add new constructors
add java3_Homework04
finish java3_Homework04
Merge pull request #26 from bbachmey/java/3/lesson/4

Java/3/lesson/4