可变长参数方法
public class varargsmethod {/** * @param args */public static double avg(double... values){double total = 0;int count = values.length;for(double i : values){total += i;}return total/count;}public static void main(String[] args) {// TODO Auto-generated method stubdouble[] dd = {12,1,1212};System.out.println(avg(3.14,23,45,5,2));System.out.println(avg(dd));System.out.println(String.valueOf(avg()));System.out.printf("平均数是 %s %n",avg(1,2));}}