If/else logical flow issue

Im creating a simple web app using Java EE that takes inputs FirstName and LastName and checks them using database object.

I would like to show a separate error page for these 2 cases :-

1.Only Last Name wrong

2.Both First Name and Last Name wrong

I have build two methods to verify, however I cant figure out the way I should write my if else statements in Servlet.

Currently it is this :-

 if(!fullNameTrue){
// show full name wrong error
         request.getRequestDispatcher("fullNameWrong.html").forward(request, response);

          }

       else  if(!firstNameTrue){
//show last name wrong error
             request.getRequestDispatcher("lastNameWrong.html").forward(request, response);  
}

         else {
// run the code without error page
         User finalUser = getUser(fname,lname);
        request.setAttribute("user",finalUser);
        request.getRequestDispatcher("displayUser.jsp").forward(request,response);
         }