Im stuck! I don't understand what the question is asking!!!!!

Well, in short, in ConferenceRegistrationAssistant.java, you need to write the code for the method getLineNumberFor.

What that code needs to do, is check the first character of the passed String lastName (we assume that character is in uppercase). If that character is between A-M, the method should return 1, and if it's between N-Z it should return 2. Comparing chars is much like comparing numbers, so >= and <= can be used to compare and conclude if a certain character falls within one of the specified ranges and act accordingly. I'm assuming you don't want the exact code to do this, but I can provide that if you want.

Another note is that Example.java is just there for reference, you don't need to write any code there, but you can check the examples to see how chars are compared and see the actual use of the method getLineNumberFor you would implement in ConferenceRegistrationAssistant.java.

Updated with code:

  public int getLineNumberFor(String lastName) {
    int lineNumber = 0;
    /*
      lineNumber should be set based on the first character of the person's last name
      Line 1 - A thru M
      Line 2 - N thru Z

     */
    char lastNameFirstChar = lastName.charAt(0);
    if (lastNameFirstChar >= 'A' && lastNameFirstChar <= 'M') {
      lineNumber = 1;
    } else {
      lineNumber = 2;
    }
    return lineNumber;
  }

I checked and this works to complete the challenge, although it can be done in a different way. Let me explain:

We are getting the first letter of the last name as a char variable named lastNameFirstChar by using the method charAt(0) on the string lastName which is passed as a parameter to our method getLineNumberFor. So for lastName "Anderson" we are getting the char 'A', for lastName "Johnson" we are getting the char 'J' etc.. I guess you get the idea.

Then we are checking if that letter (variable lastNameFirstChar) is equal or greater than A (alphabetically is equal or comes after A) AND (by using && in the code) that the same letter is equal or lower than M (alphabetically is equal or comes before M). If that's the case, it means the first letter was indeed between A and M alphabetically, so we set the lineNumber variable to the value of 1 as that's what our task requested for the method to do.

Now, my code is saying in all other cases (the else code block) set the lineNumber variable to 2 which assumes if it isn't between A-M, then it must be between N-Z. You could do the same check and write another if statement instead of the else statement and check if the letter is indeed between N-Z, in which case, if true, you would set the lineNumber variable to 2 and there would be no else statements.

In the end of method, we are returning the value of the variable lineNumber which can be either 1 or 2 depending on which of the conditions in the if/else statement was met and to what value the variable lineNumber was set. So we return 1 if the first letter was between A-M and we return 2 if it was between N-Z as the task requested.