public Employee add(Employee employee) {
if (employee == null) {
throw new NullPointerException("employee is null");
}
if (employee.getId() == 0) {
long id = employeeDao.generateEmployeeId();
employee.setId(id);
}
employeeDao.add(employee);
return employee;
}
public void delete(int id) {
Employee employee = new Employee();
employee.setId(id);
employeeDao.delete(employee);
}