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Thread: NullPointerException trouble

  1. #1
    Junior Member
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    Default NullPointerException trouble

    Hi guys,

    I've been trying for a while to solve that problem, but it just gave me headache. Really don't understand why it's not working.

    I got this message each time:
    Have a coupon? (Y/N) Exception in thread "main" java.lang.NullPointerException
    at DescuentoPeli.main(DescuentoPeli.java:14)

    He you have the whole code. Please, be kind to help me.

    import java.util.Scanner;

    class DescuentoPeli {

    public static void main(String args[]) {
    Scanner myScanner = new Scanner(System.in);
    int age;
    double price = 0.00;
    char reply;

    System.out.print("How old are you? ");
    age = myScanner.nextInt();
    System.out.print("Have a coupon? (Y/N) ");
    reply = myScanner.findInLine(".").charAt(0);

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

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

    if (reply == 'Y' || reply == 'y') {
    price -= 2.00;
    }

    if (reply != 'Y' && reply != 'y' && reply!= 'N' && reply!= 'n') {
    System.out.println("Huh?");
    }

    System.out.print("Please pay $");
    System.out.print(price);
    System.out.print(". ");
    System.out.println("Enjoy the show!");
    }
    }[/I]


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: NullPointerException trouble

    java.lang.NullPointerException
    at DescuentoPeli.main(DescuentoPeli.java:14)
    What variable on line 14 has a null value? Then backtrack in the code to see why it does not have a valid, non null value.

    Break any compound method call statements up into single method call statements and test the value returned by each method BEFORE you use that value for a further method call.

    A compound method call would look like this:
    method1().method2().method3()
    If you don't understand my answer, don't ignore it, ask a question.

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