Map

private Map<FieldEnums, Long> fields = new HashMap<>();

for (Map.Entry<FieldEnums, Long> entry : Param.getFields().entrySet()) {

            Long count = entry.getValue();

            switch (entry.getKey()) {
                case A:
                    aram.setBQuantity(count);
                    break;
                case B:
                    aram.setAQuantity(count);
                    break;
            }
        }