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Java Java Objects Creating the MVP Conference Registration Assistant

Eric Tang
PLUS
Eric Tang
Courses Plus Student 1,300 Points

LAST NAME

Hey guess I'm stuck on this question where it says A to M return a 1 and N to Z return a 2. Can someone explain what the heck is going on. This is so different from the video.

ConferenceRegistrationAssistant.java
public class ConferenceRegistrationAssistant {

  /**
   * Assists in guiding people to the proper line based on their last name.
   *
   * @param lastName The person's last name
   * @return The line number based on the first letter of lastName
   */
  public int getLineNumberFor(String lastName) {
    int lineNumber = 0;
    char letter = lastName.charAt(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

     */
    return lineNumber;
  }

}
Example.java
public class Example {

  public static void main(String[] args) {
    /*
      IMPORTANT:  You can compare characters using <, >. <=, >= and == just like numbers
     */
    if ('C' < 'D') {
      System.out.println("C comes before D");
    }

    if ('B' > 'A') {
      System.out.println("B comes after A");
    }

    if ('E' >= 'E') {
      System.out.println("E is equal to or comes after E");
    }

    // This code is here for demonstration purposes only...
    ConferenceRegistrationAssistant assistant = new ConferenceRegistrationAssistant();
    /*
      Remember that there are 2 lines.
      Line #1 is for A-M
      Line #2 is for N-Z
     */
    int lineNumber = 0;
    /*
      This should set lineNumber to 2 because
      The last name is Zimmerman which starts with a Z.
      Therefore it is between N-Z
     */
    lineNumber = assistant.getLineNumberFor("Zimmerman");

    /*
      This method call should set lineNumber to 1, because 'A' from "Anderson" is between A-M.
     */
    lineNumber = assistant.getLineNumberFor("Anderson");

    /*
      Likewise Charlie Brown's 'B' is between 'A' and 'M', so lineNumber should be set to 1
     */
    lineNumber = assistant.getLineNumberFor("Brown");
  }

}

1 Answer

Jennifer Nordell
seal-mask
STAFF
.a{fill-rule:evenodd;}techdegree
Jennifer Nordell
Treehouse Teacher

Hi Eric! I think you can get this with some hints. Let's imagine that we're at a big conference and they have to hand out badges to get in. Because they know the line is going to be long they split it up into two groups. But where should they put the badges? So they divide the badges into two groups. People who have last names beginning with A - M have their badges waiting in line 1. People who have last names beginning with N-Z have badges in line 2.

So if the last name is Brady, Carlson, Morris their badges are in line number one. And coincidentally enough (or not), you have a variable named lineNumber which can be set equal to 1. Otherwise, they should go into line 2 so the lineNumber can be set to two. Sounds a lot like an if else statement, doesn't it? :smiley:

And you have a variable set up named letter which holds the first letter of the last name. So if you check that to see if it's less than or equal to "M", then you can set the line number to 1.

Hope this helps, but let me know if you're still stuck! :sparkles:

Eric Tang
Eric Tang
Courses Plus Student 1,300 Points

THANKS A BUNCH Jennifer. The part last sentence where you said to check if less than or equal to M made the difference. I didn't think about comparing characters. I was too focused on comparing numbers instead.