The Java code below is my program that computes the average cost of an array of

Question

The Java code below is my program that computes the average cost of an array of items. I understand my code I just am very confused on how the line below helps me exactly...

sum = sum + shoppingList[m].cost();


Code:
public class Widget {

double averageCost (Widget[] shoppingList) {
double sum = 0.00; // Declares the
double average;
int m;
for (m=0; m <= shoppingList.length; m++)
{
sum = sum + shoppingList[m].cost();
}
average = sum/shoppingList.length;
return average;
}

private double cost() {
// Method that would return the cost of the widget
return 0;
}
}

Explanation / Answer

As per your code shoppingList[] is an array of object and here sum = sum + shoppingList[m].cost() here this statement is in loop...so value of m iterate from 0... Therefore, this will call cost() function with 0th index and add value returned by every index to sum... This is how your statement works.

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