Help with Null Pointer Exception

[Beginner]

Hi guys, this is my 1st post here, but expect me to be active in the following days since I am currently learning how to program Java, and I have been given a book about it, and there is this particular code on the book which I am sure that I have copied exactly, up to every letter, but the problem is it is still showing an error when I scan for a character. Please help, thanks in advance!

Scanner myScanner = new Scanner(in);
        int age;
        double price = 0.0;
        char reply;

        out.println("How old are you?");
        age = myScanner.nextInt();

        out.println("Do you have a coupon? Y/N");
        reply = myScanner.findInLine(".").charAt(0);

        if (age >= 12 && age < 65) {
            price = 9.25;
        } else if (age < 12 || age >= 65) {
            price = 5.25;
        }

        if (reply == 'y' || reply == 'Y') {
            price -= 2.00;
        } else {
            out.println("Huh?");
        }

        out.println("Please pay $" + price +
                ".");

[Fubarable]

You're running into one of the trickiest problems with using a java.util.Scanner object: capturing the end-of-line token.

When you do this:

    System.out.println("How old are you?");
    age = myScanner.nextInt();

your Scanner object grabs the next int token but not the next end-of-line token. So then when you do this:

    System.out.println("Do you have a coupon? Y/N");
    reply = myScanner.findInLine(".").charAt(0);

The Scanner object grabs the end-of-line token and tries to process it but findInLine() will return null (see the API on this).

The solution is to explicitly grab the end-of-line token after grabbing the int:

[import java.util.Scanner;

public class Fu3 {
  public static void main(String[] args) {
    Scanner myScanner = new Scanner(System.in);
    int age;
    double price = 0.0;
    char reply;

    System.out.println("How old are you?");
    age = myScanner.nextInt();
    myScanner.nextLine();  // ***** add this! ****

    System.out.println("Do you have a coupon? Y/N");
    reply = myScanner.findInLine(".").charAt(0);

    if (age >= 12 && age < 65) {
      price = 9.25;
    } else if (age < 12 || age >= 65) {
      price = 5.25;
    }

    if (reply == 'y' || reply == 'Y') {
      price -= 2.00;
    } else {
      System.out.println("Huh?");
    }

    System.out.println("Please pay $" + price + ".");
  }
}

[Beginner]

It works! Thank you very much! I will try to research about that, perhaps the code on the book is outdated? Anyways, this is a very cool forum btw, in the future when I'm more experienced on java, I'll try to help out others here too. You may lock the thread, thanks again!