tree builder

show QuadTree:

size:

unlike the previous version this QuadTree consists of multiple classes.
A QuadTree-class which performs the actions on the Tree.
A QuadTreeNode-class which stores an Object (that has the functions "getMiddleX" and "getMiddleY") and has 4 references to subTrees.
The last class is the QuadTreeEnd-class which is used to make recursive calls of a function throw diffrent Tree-Objects without having to check wheter the reference to the next Object is null or not.
This saves a lot of time!

QuadTree Compositum (more efficient)