具有自定义格式###，###。##的格式编号

import java.text.DecimalFormat;

/* from 
时 代 J a v a 公 众 号*/

public class FPAdder {

    public static void main(String[] args) {


        int numArgs = args.length;


        //this program requires at least two arguments on the command line

        if (numArgs < 2) {

            System.out

                    .println("This program requires two command-line arguments.");

        } else {

            double sum = 0.0;


            for (int i = 0; i < numArgs; i++) {

                sum += Double.valueOf(args[i]).doubleValue();/*N o w J a v a . c o m - 时代Java 提 供*/

            }


            //format the sum

            DecimalFormat myFormatter = new DecimalFormat("###,###.##");

            String output = myFormatter.format(sum);


            //print the sum

            System.out.println(output);

        }

    }

}