LinkedList and ListIterator

Question

Hello! I have been working on the following code and can get it to compile with no errors but cannot get the program to return the correct results.
When I have the ListIterator as hasPrevious() I get the following exception:
Exception in thread "main" java.util.NoSuchElementException at java.util.LinkedList$ListItr.previous(Unknown Source)
at LinkedListTest.main(LinkedListTest.java:29)
When I have the ListIterator as hasNext(), I get no return and the program gets "stuck" (like it cannot get out of the while loop).
I would like the ListIterator to start at the end of the list. Can someone take a look at the code and let me know what he/she thinks? I am very new to Java and am a little frustrated. (I apologize if this is posted incorrectly.)
Thanks in advance for any help-
Christle
import java.util.*;
import java.io.*;
public class LinkedListTest {
    public static void main(String args[]) throws java.io.IOException {
        BufferedReader bufRead = new BufferedReader (new InputStreamReader(System.in));
        String inStr = null;
        int foundN = 0;
     LinkedList roster = new LinkedList();
     roster.add("Bob");
        roster.add("Tom");
        roster.add("Jane");
        System.out.println ("\nStudents in the list: \n" + roster.toString());
        System.out.println("\nPlease enter a name to add at the beginning of the Linked List: ");
        inStr = bufRead.readLine();
     roster.addFirst(inStr);
        System.out.println ("\nAfter adding " + inStr + " at the end: \n" + roster.toString());
        System.out.println("\nPlease enter a name to find: ");
        inStr = bufRead.readLine();
     ListIterator listIter = roster.listIterator();
     while (listIter.hasPrevious());
            String aStrObj = (String) listIter.previous();
         if (aStrObj.equals(inStr)){
                  foundN++;;
         if (foundN > 0) {
              System.out.println(inStr + " is found " + foundN + " time(s).");
         else{
              System.out.println(inStr + " is not found.");
}

Answer 1

hi 'Made in NZ',
sorry about that. I misunderstood your question. Yes, my code did not cater to wrong input i.e spaces or null. Now it is fixed. Cheers.
import java.util.*;
import java.io.*;
public class LinkedListTest {
     public static void main(String args[]) {
               LinkedListTest test = new LinkedListTest();
               test.check();
     public void check() {
               BufferedReader bufRead = new BufferedReader (new InputStreamReader(System.in));
               String inStr = null;
               int foundN = 0;
               LinkedList roster = new LinkedList();
               roster.add("Bob");
               roster.add("Tom");
               roster.add("Jane");
               System.out.println ("Students in the list: " + roster.toString());
               System.out.println("Please enter a name to add at the beginning of the Linked List: ");
               try {
                              inStr = bufRead.readLine();
                              while (inStr.trim().length() == 0 || inStr == null) {
                                        System.out.println("Please enter a name");
                                        inStr = bufRead.readLine();
                              roster.addFirst(inStr);
                              System.out.println ("After adding " + inStr + " at the end: " + roster.toString());
                              System.out.println("Please enter a name to find: ");
                              inStr = bufRead.readLine();
                              ListIterator listIter = roster.listIterator();
                              while (listIter.hasNext()) {
                                   String aStrObj = (String) listIter.next();
                                   if (aStrObj.equals(inStr)){
                                        foundN++;;
                    catch (IOException ioe)
                              System.out.println("IOException occured");
               if (foundN > 0) {
                         System.out.println(inStr + " is found " + foundN + " time(s).");
               else{
                    System.out.println(inStr + " is not found.");