两种冒泡排序方法的调用

class Program
    {
        static int[] Method(int[] arr)//方法一，先去确定最大值,从后往前排
        {
            for (int i = arr.Length - 1; i > 0; i--)
            {
                for (int j = 0; j < arr.Length - 1; j++)
                {
                    if (arr[j] > arr[j + 1])
                    {
                        int k = arr[j];
                        arr[j] = arr[j + 1];
                        arr[j + 1] = k;
                    }
                }
            }
            return arr;
        }

        static int[] Method2(int[] arr)//方法二，先确定最小值，从前往后排
        {
            for (int i = 0; i < arr.Length - 1;i ++)
            {
                for (int j = i ; j <= arr.Length - 1;j++)
                {
                    if (arr[i] > arr[j])
                    {
                        int k = arr[i];
                        arr[i] = arr[j];
                        arr[j] = k;
                    }
                }
            }
            return arr;
        }
        static void Main(string[] args)
        {
            int[] arr = new int[18];
            for (int i = 0;i <= 17;i ++)
            {
                Random rd = new Random();
                Thread.Sleep(200);
                arr[i] = rd.Next(100);
            }
            foreach (int i in arr)
                Console.Write(i + " ");
            Console.Write("\n");
            //利用方法一输出结果
            Console.WriteLine ("方法一输出从小到大：");
            arr = Method(arr);
            foreach (int i in arr)
                Console.Write(i + " ");
            //利用方法二输出结果
            Console.WriteLine("\n方法二输出从小到大：");
            arr = Method2(arr);
            foreach (int i in arr)
                Console.Write(i + " ");
            Console.ReadLine();
        }
    }