计算平均值的数组

Question

I'm attempting to calculate the average number of entries using an array. The method doesn't execute properly. Any help is appreciated.

public static double calculateAverage (double[] Array) {
    int person= 0;
    int total= 0;


    for(int i = 0; i < person.length; i++)
{
    total += avgCustomer[i];
}
    double avgPerson = total/ person.length;
    return avgPerson;

Answer 1

At least one part of the issue is this:

int customer = 0;
...
double[] bfpArray = new double[customer];
int[] avgCustomer = new int[customer];

System.out.print("Please enter the number of customers: ");
customer = input.nextInt();

As this current code will create the arrays bfpArray and avgCustomer to have a length of 0.

Moving the array initialization until after the number of customers has been collected (though it would be good to ensure that the entry is valid) would help:

System.out.print("Please enter the number of customers: ");
customer = input.nextInt();

double[] bfpArray = new double[customer];
int[] avgCustomer = new int[customer];

Then, as @shikai ng noted, you will need to adjust your loop:

for (i = 0; i < customer; i++) {

as Java arrays are 0 based.

Answer 2

You are having an array out of bound exception. just make sure you start ur for loop with i = 0 not i = 1

    for (i = 0; i <= customer; i++) {
    ......}

and initialize bfparray only after getting the number of customers