泛型集合

class Program
    {
        static void Main(string[] args)
        {
            ArrayList a = new ArrayList();//集合类型为object
            List<int> li=new List<int>();//集合类型不确定
              Stopwatch sw1 = new Stopwatch();
            Stopwatch sw2 = new Stopwatch();

            sw1.Start();
            for (int i = 0; i < 100000; i++)//该循环需要是的时间明显长
              {
                a.Add(i);//因为ArrayList是object类型.需要将object类型转换为int类型
              }
            sw1.Stop();
            Console.WriteLine(sw1.Elapsed);
            sw1.Start();

            for (int i = 0; i < 100000; i++)//该循环需要的时间明显短
              {
                li.Add(i);
               } 
            sw2.Stop();
            Console.WriteLine(sw2.Elapsed);

            //如果处理的是一个类比如Person类,泛型集合仍然课表现出较好的效率

              Hashtable h = new Hashtable();
            Dictionary<string,Person> d=new Dictionary<string,Person>();
            Person   p1=new Person("翟群",16);
            Person p2=new Person("何雄军",24);
            d.Add(p1.Name,p1);
            d.Add(p2.Name,p2);
            //p2与d["何雄军"]都可以访问到p2对象
            Console.ReadKey();
        }
    }
    class Person
    {
        private string name;
        public string  Name
        {
            set { name =value; }
            get { return name; }
        }
        private int age;
        public int Age
        {
            get { return age; }
        }
        public void SayHello()
        {
            Console.WriteLine("我叫{0},我今年{1}岁了");
        }
        public Person(string name,int age)
        {
            this.name = name;
            this.age = age;
        }
    }

class Program
    {
        static void Main(string[] args)
        {
            ArrayList a = new ArrayList();//集合类型为object
            List<int> li=new List<int>();//集合类型不确定
              Stopwatch sw1 = new Stopwatch();
            Stopwatch sw2 = new Stopwatch();

            sw1.Start();
            for (int i = 0; i < 100000; i++)//该循环需要是的时间明显长
              {
                a.Add(i);//因为ArrayList是object类型.需要将object类型转换为int类型
              }
            sw1.Stop();
            Console.WriteLine(sw1.Elapsed);
            sw1.Start();

            for (int i = 0; i < 100000; i++)//该循环需要的时间明显短
              {
               li.Add(i);
            } 
            sw2.Stop();
            Console.WriteLine(sw2.Elapsed);

            //如果处理的是一个类比如Person类,泛型集合仍然课表现出较好的效率

              Hashtable h = new Hashtable();
            Dictionary<string,Person> d=new Dictionary<string,Person>();
            Person   p1=new Person("翟群",16);
            Person p2=new Person("何雄军",24);
            d.Add(p1.Name,p1);
            d.Add(p2.Name,p2);
            //p2与d["何雄军"]都可以访问到p2对象
            Console.ReadKey();
        }
    }
    class Person
    {
        private string name;
        public string  Name
        {
            set { name =value; }
            get { return name; }
        }
        private int age;
        public int Age
        {
            get { return age; }
        }
        public void SayHello()
        {
            Console.WriteLine("我叫{0},我今年{1}岁了");
        }
        public Person(string name,int age)
        {
            this.name = name;
            this.age = age;
        }
    }