Java Objects, Conference Registration Assistant

Question

Hi, I'm unsure on how to rewrite my finished code. Can someone please take a look at this?

The directions tell me to: "Fix the getLineNumberFor method to return a 1 if the first character of lastName is between A and M or else return 2 if it is between N and Z."

I thought I did it correctly based on an if/else statement. I received 0 errors but a simple revision that says: "Make sure you use the lastName that was passed in to the method. You can get characters using the charAt method on Strings"

I thought I would use "lineNumber" because that's the integer being used instead of "lastName". Also, I'm not sure what the statement means "..using the charAt method on Strings." I didn't see that used in the last video, so I guess that's my problem.

ConferenceRegistrationAssistant.java

public class ConferenceRegistrationAssistant {  

  public int getLineNumberFor(String lastName) {
    int lineNumber = 0;

    if (lineNumber >= 'A' && lineNumber <= 'M') {
      System.out.println("1");
    } else {
      System.out.println("2");
    } 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");
  }

}

Answer 1 · 2016-12-27T03:14:17Z

December 27, 2016 3:14am

charAt is both used and explained in the last video, to be more specific Craig first starts talking about it at around 2:10 in the Prompting for Guesses video. Maybe you skipped over the video by accident?

Anyway to summarize the relevant portion of the video the charAt method is simply a method you can use on strings to pull out a single char from the string at a given index. So by using charAt(0) for example you get access to the first character in a string.

To solve this task you have to compare the first character of the lastName string to 'A' and 'M'. The lineNumber variable is there because the method is meant to return the line number, you are supposed to set that variable to 1 if the first character of the last name is between 'A' and 'M' and set it to 2 if it isn't. And then return the lineNumber variable at the end.

So the two main issues with your current solution is that you are not actually comparing the lastName variable like you are supposed to, and the fact that you are printing 1, and 2. Instead of setting the lineNumber variable equal to 1 or 2, which is what the challenge is actually asking you to do.

If you fix those two issues you will be able to complete the challenge. If you still have trouble solving it after reading the hints I have given then I can post the solution for you, but ideally you should try to solve it yourself first.

Answer 2 · 2016-12-27T06:04:05Z

December 27, 2016 6:04am

cool here is your answer

if (lastName.charAt(0) >= 'A' && lastName.charAt(0) <= 'M') { System.out.println("1"); } else { System.out.println("2"); }

"charAt(zero) not O"

else you have all the logic up to mark just this change you are done..... enjoy coding

Answer 3 · 2017-01-04T16:10:30Z

January 4, 2017 4:10pm

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

 */
String one = "ABCDEFGHIJKLM";
String two = "NOPQRSTUVWXYZ";
boolean checkLetter = one.indexOf(lastName.charAt(0)) != -1;
if (checkLetter){
  return lineNumber = 1;
} else {
  return lineNumber = 2;
}

}

Answer 4 · 2019-02-04T16:56:16Z

February 4, 2019 4:56pm

Thanks for you help here, it helped me figure it out for myself and understand it better :)

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Gendarme Docena

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Java Objects, Conference Registration Assistant

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