final ListInteger roles = ListsnewArrayList; if activityAppraiseeServiceexistByEmpCodeempCode rolesaddUserTypeEnumAPPRAISEEgetValue; if activityExaminerServiceexistBy

List roles = Stream.of( activityAppraiseeService.existByEmpCode(empCode) ? UserTypeEnum.APPRAISEE.getValue() : null, activityExaminerService.existByEmpCode(empCode) ? UserTypeEnum.EXAMINER.getValue() : null) .filter(Objects::nonNull) .collect(Collectors.toList());