comma(,) in printf prob

[Ashenvale]

for (ctr = 0; ctr<cost.length; ctr++) { 
           cost[ctr] = price[ctr] * qty[ctr];
           totalCost = totalCost + cost[ctr];
           aveCost = totalCost / cost.length; }
            System.out.printf("Average Cost: %.2f\n\n", aveCost);

with this code the output will be, for example:

Average Cost: 15900.00

I want my output to look like this

Average Cost: 15,900.00

*the output number can change depends on what is inside the array. Is there an easy way? I look all over the internet and I all I see are those very long codes that takes up like 1 whole bond paper just to put the comma(,). I just want a very simple code which even a newbie like me can understand, I'm still not very good at programming.

[stultuske]

you can create a small method, where you convert your float into a String, with the separator (the ,) on the correct spot. then you return that String and place that in your printf command

[NormR1]

Does the printf method take formatting rules that will insert ,s into numeric output?
Look at the API doc and at the DecimalFormat class for example.