MazizEsa

public class IncorrectCoupling {
    public static class Points{
        private String productId;
        private Long totalPoints;

        private PointsMappingExternalSystem pointsMappingExternalSystem;
        private PointsMultiplierExternalSystem pointsMultiplierExternalSystem;

        public Double calculateTotalPoints(){
            return pointsMappingExternalSystem.getPointsMappingFromExternalSystem().stream().map(PointsMapping::getPoints).reduce(0d, Double::sum)