集合ArrayList案例

ArrayList n = new ArrayList();
            n.Add(1);//集合中添加元素用Add,分别添加了1，2
            n.Add(2);

            foreach (int a in n)//用foreach循环语句读取
            {
                Console.WriteLine(a);
            }

ArrayList cj = new ArrayList();
            for (int i = 0; i < 10; i++)
            {
                Console.WriteLine("请输入第{0}同学的成绩", i + 1);
                cj.Add(Convert.ToInt32(Console.ReadLine()));
            }
            int sum = 0;
            foreach (int a in cj)
            {
                sum = sum + a;
            }
            int avg = sum / cj.Count;
            cj.Sort();

            Console.WriteLine("平均分为：" + avg);
            foreach (int a in cj)
            {
                Console.WriteLine(a);
            }