public List query(double x1,double x2){
  return super.query(new Interval(Math.min(x1,x2),Math.max(x1,x2)));
}

public List query ( double x1 , double x2 ) { return super . query ( new Interval ( Math . min ( x1 , x2 ) , Math . max ( x1 , x2 ) ) ) ; }
returns items whose bounds intersect the given bounds .
