Merge pull request #3 from bbachmey/java/1/lesson/11

Java/1/lesson/11
Changed calculation for centerX and CenterY
Merge pull request #4 from bbachmey/java/1/lesson/11

Changed calculation for centerX and CenterY
Merge pull request #5 from bbachmey/java/1/lesson/12

Java/1/lesson/12
Update new_lesson.md