question: public static Coordinate ptNotInList ( Coordinate [ ] testPts , Coordinate [ ] pts ) { for ( int i = 0 ; i < testPts . length ; i ++ ) { Coordinate testPt = testPts [ i ] ; if ( ! isInList ( testPt , pts ) ) return testPt ; } return null ; }
target:  Finds a point in a list of points which is not contained in another list of points