集合类List与Dictonary实例练习

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using System; 
using System.Collections.Generic; 
namespace _02_泛型集合 { 
class Person { 
public Person(string name, int age) { 
this .name = name; 
this .age = age; 
} 
private string name; 
public string Name { 
get { 
return name; 
} 
set { 
name = value ; 
} 
} 
private int age; 
public int Age { 
get { 
return age; 
} 
set { 
age = value ; 
} 
} 
} 
class Student : Person { 
public Student(string name, int age) 
: base (name, age) { 
} 
} 
class Teacher : Person { 
public Teacher(string name, int age) 
: base (name, age) { 
} 
} 
class Program { 
static void Main( string[] args) { 
Student xyy = new Student( "小月月" , 12); 
Student fj = new Student( "凤姐" , 14); 
Student fr = new Student( "芙蓉姐姐" , 16); 
Student xl = new Student( "犀利哥" , 18); 
List <Student > student = new List <Student >(); 
student.Add(xyy); 
student.Add(fj); 
student.Add(fr); 
student.Add(xl); 
Teacher tea = new Teacher( "wanghao" , 21); 
//student.Add(tea);//因为List<Student> 限制类型必须为Student 所以不能添加Teacher对象 
//比ArrayList更加限制存储的类型 而且效率要高 因为添加 取出对象是不会发生装箱 拆箱的操作的 
//遍历 
foreach (Student item in student) { 
Console .WriteLine(item.Name);//因为返回的就是student对象 所以可以直接读取属性值 
Console .WriteLine(item.Age); 
} 
//移除 
student.Remove(xyy); //移除的是引用地址 所以下面移除的s不是xyy 
Student s = new Student( "小月月" , 12); 
student.Remove(s); 
student.RemoveAt(0); 
student.RemoveRange(0, 2); //从0索引移除后面两位 即前移除前两位学生 xyy fj 
//student.RemoveAll();//移除所有满足条件的 详见帮助文档 
student.Clear(); 
Console .WriteLine(student.Contains(xyy)); 
//ToArray()方法 转换学生类型数组 
Student [] stu = student.ToArray(); 
foreach (Student item in stu) { 
Console .WriteLine(item.Name); 
} 
Console .Read(); 
} 
} 
} 
 
b、Dictonary<>字典 
 代码如下:

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using System; 
using System.Collections.Generic; 
namespace _03_泛型集合 { 
class Student { 
public Student(string name, int age) { 
this .name = name; 
this .age = age; 
} 
private string name; 
public string Name { 
get { 
return name; 
} 
set { 
name = value ; 
} 
} 
private int age; 
public int Age { 
get { 
return age; 
} 
set { 
age = value ; 
} 
} 
} 
class Program { 
static void Main( string[] args) { 
Student xyy = new Student( "小月月" , 12); 
Student fj = new Student( "凤姐" , 14); 
Student fr = new Student( "芙蓉姐姐" , 16); 
Student xl = new Student( "犀利哥" , 18); 
Dictionary <string , Student> student = new Dictionary < string, Student >();//key为string类型的name value为Student对象 
student.Add( "小月月" , xyy); 
student.Add( "凤姐" , fj); 
student.Add( "芙蓉姐姐" , fr); 
student.Add( "犀利哥" , xl); 
Console .WriteLine(student["犀利哥" ].Name); //根据key获取value 
//遍历 通过key 
foreach (string item in student.Keys) { 
Console .WriteLine(item); 
Console .WriteLine(student[item].Age); 
} 
//遍历 通过value 
foreach (Student item in student.Values) { 
Console .WriteLine(item.Age); 
} 
//遍历键值对 
foreach (KeyValuePair < string, Student > item in student) { 
Console .WriteLine(item.Key); 
Console .WriteLine(item.Value.Age);//item.Value是Student对象 直接使用 
} 
//移除 
//student.Remove("小月月"); 
//student.Clear(); 
student.ContainsKey( "小月月" ); //是否包含该key 
//更多参见帮助文档 
Console .Read(); 
} 
} 
} 
 
c、泛型集合练习 
 代码如下:

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using System; 
using System.Collections.Generic; 
namespace _04__泛型练习 { 
class Program { 
static void Main( string[] args) { 
//把分拣奇偶数的程序用泛型实现 
string str = "7 4 3 2 9 8 33 22" ; 
string [] strs = str.Split(' ' ); 
strs = Getevent(strs).ToArray(); 
string res = string .Join( " ", strs); //string数组 直接用join就好了 
Console .WriteLine(res); 
//将int数组中的奇数放到一个新的int数组中返回 
int [] intarr = { 1, 2, 3, 4, 5, 6, 7, 8, 9 }; 
List <int > list = new List <int >(); 
foreach (int item in intarr) { 
if (item % 2 != 0) { 
list.Add(item); 
} 
} 
intarr = list.ToArray(); 
foreach (int item in intarr) { 
Console .WriteLine(item); 
} 
//从一个整数的List<int>中取出最大数。不使用自身带的Max()方法。 
List <int > list2 = new List <int > { 1, 2, 3, 4, 5, 6, 7, 8 }; 
int max = list2[0]; 
foreach (int item in list2) { 
if (item > max) { 
max = item; 
} 
} 
Console .WriteLine("泛型集合最大值为{0}" , max); 
Console .ReadKey(); 
} 
public static List< string > Getevent(string [] str) { 
List <string > list = new List <string >(); 
List <string > list2 = new List <string >(); 
foreach (string item in str) { 
if (int .Parse(item) % 2 != 0) { 
list.Add(item); 
} else { 
list2.Add(item); 
} 
} 
list.AddRange(list2); 
return list; 
} 
} 
} 
 
d、泛型集合练习2 
 代码如下:

View Code 
using System; 
using System.Collections.Generic; 
namespace _06_泛型集合练习 { 
class Program { 
static void Main( string[] args) { 
//把1，2，3转换为壹贰叁 
string str = "1壹 2贰 3叁 4肆 5伍 6陆 7柒 8捌 9玖 0零" ; 
Dictionary <char , char> money = new Dictionary < char, char >(); 
string [] strs = str.Split(' ' ); 
string s = "123456789" ; 
string news = "" ; 
for (int i = 0; i < strs.Length; i++) { 
money.Add(strs[i][0], strs[i][1]); 
} 
foreach (char item in s) { 
news += money[item]; 
} 
Console .WriteLine(news); 
char n = '1' ; 
Console .WriteLine(n + ' ' ); //结果显示为81 char字符相加是把其Asic码相加的 
Console .WriteLine(n + 2);//结果显示为51 
//如果想实现字符串相加就把任一个参数改变为tostring