I need to create a 2D array that holds the number of family members by the highest numbe of titles of one of the family members, and they input on one line. However, I am having trouble when I call the class in my other code in the main method. It says java.nullpointerexception at setTitles, and I know it has something to do with my arrays, but I don't know how to store the user input in the 2d array for my for loops afterwards, because they are based on the size of my 2D array.

public class Geneology
private String[] family;  
private int[][] memberName;
private int size;
private int sizeNo;
private String titles;
private Scanner input = new Scanner(System.in);

public String setTitles()
  System.out.printf("\nYou will be entering the titles for your family members."
                      +"\nHow many family members will be entered?"
                      +"\nAlso, enter the highest number of titles of one of the family members: ");
  memberName[size][0] = input.nextInt();
  memberName[0][sizeNo] = input.nextInt();

for(int a = 0; a < memberName[size].length; a++)
  System.out.printf("\nEnter name of member %d: ", a+1);
  family[a] = input.nextLine();

  for(int b = 0; b < memberName[sizeNo].length; b++)
    System.out.printf("\nEnter title %d for %s: ", b+1, family[a]);
    titles += input.nextLine();
  return titles;

I just learned arrays, so please bare with me.

4 Years
Discussion Span
Last Post by brittney_2

Well, I realized I need to initialize my int size and sizeNo and my arrays plus all my other variables, I think! However, I still need to know how to store the size of what the user inputs into my memberName[][].

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