is the set empty ? concode_field_sep Node right concode_elem_sep Comparator<Point2D> ORDER_BY_Y concode_elem_sep Node root concode_elem_sep int count concode_elem_sep Node parent concode_elem_sep Comparator<Point2D> ORDER_BY_X concode_elem_sep Point2D key concode_elem_sep Node left concode_field_sep NodeType next concode_elem_sep NodeType next concode_elem_sep NodeType next concode_elem_sep Point2D nearest_helper concode_elem_sep int compare concode_elem_sep int compare concode_elem_sep int compare concode_elem_sep int compare concode_elem_sep int compare concode_elem_sep int compare concode_elem_sep boolean contains concode_elem_sep int size concode_elem_sep void draw_helper concode_elem_sep void insert concode_elem_sep Iterable<Point2D> range concode_elem_sep void findPointsHelper concode_elem_sep void draw concode_elem_sep Point2D nearest
boolean function ( ) { return ( root == null ) ; }