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Java Java Objects Creating the MVP Conference Registration Assistant

keller greathouse
keller greathouse
3,804 Points

I don't understand any of this

Help, I don't understand any of this and I don't think my code works. At all.

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;

    lineNumber = get.lineNumber( firstLetter >m); then 
    { System.out.printf("go to line 2"); } else { (firstLetter !>m) then 
      System.out.printf ("go to line 1"); }

    /*
      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

Steven Parker
Steven Parker
231,172 Points

Here's a few hints:

  • the instructions say to make the function return either 1 or 2 — you won't need to print anything
  • Java doesn't use a "then" keyword for conditionals — are you studying other languages at the same time?
  • there's no !> operator — the opposite of > is <=
  • you haven't defined a "firstLetter", but you won't need it if you use the string method for isolating characters
  • remember to quote literal characters — see the examples in the Example.java code
  • you will only need one test, because if it fails you can assume the other condition