CODEWITHSUNDEEP
javapointers
adc90
adc90

Reputation: 303

Referencing troubles

I'm writing a program that creates an object which holds to inputs from the user and stores it in an ArraySortedList. One of the requirements is to check and see if the particular object is already in the list. The trouble I'm having is whenever I input a secound set of information I get an error.

    //Global variables at the top
    ListInterface <Golfer> golfers = new ArraySortedList < Golfer > (20);
    Golfer golfer;

    //Function Variables
    Scanner add = new Scanner(System.in);
    Golfer tempGolfer;
    String name = ".";
    int score;

    while(!name.equals("")) //Continues until you hit enter
    {
        System.out.print("\nGolfer's name (press Enter to end): ");
        name = add.next();
        System.out.print("Golfer's score (press Enter to end): ");
        score = add.nextInt();
        tempGolfer = new Golfer(name,score);

        if(this.golfers.contains(tempGolfer))
            System.out.println("The list already contains this golfer");
        else
        {
            this.golfers.add(this.golfer);
            System.out.println("\nYou added \'Golfer(" + name + "," + score + ")\' to the list!");
        }
    }

Error Message:

Exception in thread "main" java.lang.NullPointerException
at ArrayUnsortedList.find(ArrayUnsortedList.java:67)
at ArrayUnsortedList.contains(ArrayUnsortedList.java:110)
at GolfApp.addGolfer(GolfApp.java:90)
at GolfApp.mainMenu(GolfApp.java:52)
at GolfApp.main(GolfApp.java:24)

I'm almost sure it's something to do with how the variable is referenced but I'm not really sure how I could fix it, I have a lot of trouble with variable referencing.

Upvotes: 1

Views: 86

Answers (1)

richardtz
richardtz

Reputation: 4993

Your golfer variable is not initalized. try with :

this.golfers.add(tempGolfer);

regards.

Upvotes: 3

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