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Java Java Objects Creating the MVP Conference Registration Assistant

Prem Yadav
Prem Yadav
7,346 Points

not able to solve this problem...

I have used charAt(0) method to scan first letter of lastName but still Bummer occurred. Please help where i'm doing mistake.

ConferenceRegistrationAssistant.java
import java.util.Scanner;
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 should be set based on the first character of the person's last name
      Line 1 - A thru M
      Line 2 - N thru Z

     */
    Scanner scanner = new Scanner(System.in);
      System.out.print("Enter A Letter: ");
      String guessInput = scanner.nextLine();
      char guess = guessInput.charAt(0);
    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

First you save your char in variable type char then just check with if statement, like this: you don't need scanner since you passing lastName as parameter in function, so use it ;)

public int getLineNumberFor(String lastName) {
    int lineNumber = 0;
    char letter = lastName.charAt(0);

    if (letter >= 'A' && letter <= 'M') {
      lineNumber = 1; 
    } else if (letter >= 'N' && letter <= 'Z') {
      lineNumber = 2; 
    }

    return lineNumber;
  }