C#集合C#基础学习

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 
 7 using System.Collections;
 8 
 9 namespace day01
10 {
11     class Class24
12     {
13         static void Main(string[] args)
14         {
15             ArrayList list = new ArrayList();
16             list.Add(new Student("zhangsan", 23));
17             list.Add(new Student("lisi", 24));
18             list.Add(new Student("wangwu", 25));
19 
20             foreach(Student temp in list)
21             {
22                 Console.WriteLine(temp.ToString());
23             }
24 
25             Console.WriteLine();
26             //其实调用的对象是Object类型的 因为重写了Object的ToString()方法 所以调用时有多态的存在
27             Console.WriteLine(list[2].ToString());
28             //验证了返回的对象类型为Object类型 要调用方法 需要强制类型转换才行
29             ((Student)list[2]).GetInfo();
30             Console.ReadKey();
31         }
32     }
33     public class Student
34     {
35         private string name;
36         private int age;
37         public string Name { get; set; }
38         public int Age { get; set; }
39         public Student()
40         {
41 
42         }
43         public Student(string name,int age)
44         {
45             Name = name;
46             Age = age;
47         }
48         public override string ToString()
49         {
50             return "name: " + Name + " age: " + Age;
51         }
52         public void GetInfo()
53         {
54             Console.WriteLine("name is {0} age is {1}", Name, Age);
55         }
56     }
57 }