方法 求和

public class ChangeArgs {
    public static void main(String[] args) {
        // 求数组的和
        int[] arr = {1,3,5,7,9};
        Count03 c = new Count03();
        int sum = c.getSum1(arr);
        System.out.println("(1)数组的和:" + sum);

        int sum2 = c.getSum2(arr);
        System.out.println("(2)数组的和:" + sum2);

        //
        int sum3 = c.getSum2(1,3,5,7,9);
        System.out.println("(3)数组的和:" + sum3);
    }
}

class Count03{
    // 常规的方法 求和
    public int getSum1(int[] arr){ //数组求和函数 接收的参数必须数组
        int sum=0;
        for (int i = 0; i < arr.length; i++){
            sum += arr[i];
        }
        return  sum;
    }

    public int getSum2(int...arr){
        int sum = 0;
        for (int i = 0; i < arr.length; i++){
         sum += arr[i];
        }
        return  sum;
    }

}