Null out of bounds error in single array

Question

I have created this program but I am getting a null out of bounds error. What have I done wrong?I would appreciate your expert opinions. I have commented the error points.
import javax.swing.JOptionPane;
import java.text.NumberFormat; //Imports class for currency formating
public class VillageDataSort {
//Data fields
private HouseHolds[] Village;
private double totIncome;
private double avgAnulIncm;
private double povertyLvl;
//Method to create memory allocations for Village array
public void HouseholdData(){
Village = new HouseHolds[13];
int index = 0;
for(index = 0; index < Village.length; index++);
Village[index] = new HouseHolds(); //Error point
Village[index].dataInput(); //Error point
//Calculates the average annual income
public double avgIncome(){
totIncome = 0;
int index = 0;
for(index = 0; index < Village.length; index++);
totIncome += Village[index].getAnnualIncome();
avgAnulIncm = totIncome / Village.length;
return avgAnulIncm;
//Displays households with above average income
public void displayAboveAvgIncome(){
int index = 0;
for(index = 0; index < Village.length; index++);
if (Village[index].getAnnualIncome() >= avgIncome())
System.out.println("Households that are above the average income : " + avgIncome());
System.out.println("Household ID " + "\t" + "Annual Income " + "\t" + "Household Members");
System.out.println(Village[index].getIdNum() + "\t" + Village[index].getAnnualIncome() + "\t" + Village[index].getFamilyMems());
//Calculates and displays the households that fall below the poverty line
public void povertyLevel(){
int index = 0;
povertyLvl = 0;
for(index = 0; index < Village.length; index++);
povertyLvl = 6500 + 750 * (Village[index].getFamilyMems() - 2);
if (Village[index].getAnnualIncome() < povertyLvl)
System.out.println("Households that are below the poverty line");
System.out.println("Household ID " + "\t" + "Annual Income " + "\t" + "Household Members");
System.out.println(Village[index].getIdNum() + "\t" + Village[index].getAnnualIncome() + "\t" + Village[index].getFamilyMems());
}

Answer 1

Thanks again scsi, I see where it gets together. I
even found the Class interface error started in the
previous method to calculate the average. The program
compiled but it outputted nothing just a bunch of
zero's. I know I haven't referenced correctly yet
again why does it not grab the data.I changed the
array to 4 numbers for testing purposesis this a question or a statement?
well there are problems in you HouseHolds class.
import javax.swing.JOptionPane;
public class HouseHolds{
// Data
private int idNum;
private double anlIncm;
private int famMems;
//This method gets the data from the user
public void dataInput(){
// if you are trying to set the int idNum here you are not doing this.
String idNum =
JOptionPane.showInputDialog("Enter a 4 digit household ID number");
// same with this
String anlIncm =
JOptionPane.showInputDialog("Enter the households annual income");
// and also this one.
String famMems =
JOptionPane.showInputDialog("Enter the members of the family");
} as a service to you look at these two API links.
http://java.sun.com/j2se/1.3/docs/api/java/lang/Integer.html
and
http://java.sun.com/j2se/1.3/docs/api/java/lang/Double.html
now here is the revised code for one of your variable settings.
you will have to do the rest on your own.
String idString = JOptionPane.showInputDialog("Enter a 4 digit household ID number");
idNum = Integer.parseInt(idString);