Java可变参数

package com.ding.mymap;


public class Demo {
    public static void main(String[] args) {
        System.out.println(sum(10, 20));
        System.out.println(sum(10, 20, 30));
        System.out.println(sum(10, 20, 30, 40));

    }

    public static  int sum(int... a) {
        int sum = 0;
        for (int i : a) {
            sum += i;
        }
        return  sum;
    }

           /*
           30
           60
           100
           */
}