可变参数计算和

可以传递多个参数,int…若干个int类型参数

public static void sum(int... numbers){
        int result = 0;
        for (int i = 0;i < numbers.length; i++){
            result += numbers[i];
        }
        System.out.println(result);
    }

    @Test
    public void testSum(){
        sum();
        sum(1);
        sum(1,2);
        sum(1,2,3);
    }