집합 클래스 List 와 Dictonary 인 스 턴 스 연습

 
View Code 
using System; 
using System.Collections.Generic; 
namespace _02_     { 
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( "   " , 12); 
Student fj = new Student( "  " , 14); 
Student fr = new Student( "    " , 16); 
Student xl = new Student( "   " , 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);//  List<Student>        Student       Teacher   
// ArrayList                                         
//   
foreach (Student item in student) { 
Console .WriteLine(item.Name);//       student               
Console .WriteLine(item.Age); 
} 
//   
student.Remove(xyy); //                s  xyy 
Student s = new Student( "   " , 12); 
student.Remove(s); 
student.RemoveAt(0); 
student.RemoveRange(0, 2); // 0                   xyy fj 
//student.RemoveAll();//                 
student.Clear(); 
Console .WriteLine(student.Contains(xyy)); 
//ToArray()            
Student [] stu = student.ToArray(); 
foreach (Student item in stu) { 
Console .WriteLine(item.Name); 
} 
Console .Read(); 
} 
} 
} 

 
View Code 
using System; 
using System.Collections.Generic; 
namespace _03_     { 
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( "   " , 12); 
Student fj = new Student( "  " , 14); 
Student fr = new Student( "    " , 16); 
Student xl = new Student( "   " , 18); 
Dictionary <string , Student> student = new Dictionary < string, Student >();//key string   name value Student   
student.Add( "   " , xyy); 
student.Add( "  " , fj); 
student.Add( "    " , fr); 
student.Add( "   " , xl); 
Console .WriteLine(student["   " ].Name); //  key  value 
//     key 
foreach (string item in student.Keys) { 
Console .WriteLine(item); 
Console .WriteLine(student[item].Age); 
} 
//     value 
foreach (Student item in student.Values) { 
Console .WriteLine(item.Age); 
} 
//      
foreach (KeyValuePair < string, Student > item in student) { 
Console .WriteLine(item.Key); 
Console .WriteLine(item.Value.Age);//item.Value Student        
} 
//   
//student.Remove("   "); 
//student.Clear(); 
student.ContainsKey( "   " ); //     key 
//         
Console .Read(); 
} 
} 
} 

 
View Code 
using System; 
using System.Collections.Generic; 
namespace _04__     { 
class Program { 
static void Main( string[] args) { 
//               
string str = "7 4 3 2 9 8 33 22" ; 
string [] strs = str.Split(' ' ); 
strs = Getevent(strs).ToArray(); 
string res = string .Join( " ", strs); //string      join    
Console .WriteLine(res); 
// int            int      
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); 
} 
//      List<int>      。       Max()  。 
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("        {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; 
} 
} 
} 

 
View Code 
using System; 
using System.Collections.Generic; 
namespace _06_       { 
class Program { 
static void Main( string[] args) { 
// 1，2，3       
string str = "1  2  3  4  5  6  7  8  9  0 " ; 
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 + ' ' ); //     81 char       Asic     
Console .WriteLine(n + 2);//     51 
//                    tostring   
Console .WriteLine(n.ToString() + 2);//   12 
//               （   ）。“Welcome to Chinaworld”，      ，  “W 2” “e 2” “o 3”…… 
string str2 = "Welcome to Chinaworld" ; 
Dictionary <char , int> num = new Dictionary < char, int >(); 
foreach (char item in str2.ToLower().Replace( " " , "" )) { 
if (num.ContainsKey(item)) { 
num[item]++; 
} else { 
num.Add(item, 1); 
} 
} 
foreach (var key in num.Keys) { 
Console .WriteLine("\"{0}{1}\"" , key, num[key]); 
} 
//            ，                  ，  ：                 2012-12-21。 
string date = "            " ; //date2                                         1            0          10        
//string date = "          "; 
string strNumb = " 1  2  3  4  5  6  7  8  9  0" ; 
string [] strNumbs = strNumb.Split(' ' ); 
string nullYear = "" ; 
Dictionary <char , char> years = new Dictionary < char, char >(); 
for (int i = 0; i < strNumbs.Length; i++) { 
years.Add(strNumbs[i][0], strNumbs[i][1]); 
} 
//years.Add(' ', '-'); 
//years.Add(' ', '-'); 
for (int i = 0; i < date.Length; i++) { 
if (years.ContainsKey(date[i])) { 
nullYear += years[date[i]]; 
} else if (date[i] == ' ' || date[i] == ' ' ) { 
nullYear += '-' ; 
} else if (date[i] == ' ' && years.ContainsKey(date[i + 1]) && !years.ContainsKey(date[i - 1])) { 
nullYear += '1' ; 
} else if (date[i] == ' ' && !years.ContainsKey(date[i + 1]) && years.ContainsKey(date[i - 1])) { 
nullYear += '0' ; 
} else if (date[i] == ' ' && !years.ContainsKey(date[i + 1]) && !years.ContainsKey(date[i - 1])) { 
nullYear += "10" ; 
} 
} 
Console .WriteLine(nullYear); 
Console .ReadKey(); 
} 
} 
} 

 
View Code 
using System; 
using System.Collections.Generic; 
namespace _07_  Change { 
class Program { 
static string str = " 1  2  3  4  5  6  7  8  9  0" ; 
static string [] strs = str.Split( ' '); 
static Dictionary < char, char > money = new Dictionary< char , char >(); 
static void Main( string[] args) { 
for (int i = 0; i < strs.Length; i++) { 
money.Add(strs[i][0], strs[i][1]); 
} 
//string date = "          "; 
string date = "            " ; 
date = newstr(date); 
string nullYear = "" ; 
//money.Add(' ', '-'); 
//money.Add(' ', '-'); 
for (int i = 0; i < date.Length; i++) { 
if (money.ContainsKey(date[i])) { 
nullYear += money[date[i]]; 
} else if (date[i] == ' ' || date[i] == ' ' ) { 
nullYear += '-' ; 
} 
} 
Console .WriteLine(nullYear); 
Console .WriteLine(date);//            
Console .ReadKey(); 
} 
//                            1            0          10 
public static string newstr( string str) { 
string newstr = "" ; 
for (int i = 0; i < str.Length; i++) { 
if (str[i] == ' ' ) { 
bool left = money.ContainsKey(str[i - 1]); 
bool right = money.ContainsKey(str[i + 1]); 
if (left && right) { 
newstr += "" ; 
} else if (right) { //!left && 
newstr += " " ; 
} else if (left) { //&& !right 
newstr += " " ; 
} else {//if (!left && !right) 
newstr += "  " ; 
} 
} else { 
newstr += str[i]; 
} 
} 
return newstr; 
} 
} 
} 

 
View Code 
using System; 
using System.Collections.Generic; 
using System.IO; 
using System.Linq; 
using System.Text; 
using System.Windows.Forms; 
namespace _05_     { 
public partial class Form1 : Form { 
public Form1() { 
InitializeComponent(); 
} 
Dictionary <string , string> dic = new Dictionary < string, string >(); 
private void btnChange_Click( object sender, EventArgs e) { 
if (dic.ContainsKey(txtEnglish.Text)) { 
txtChina.Text = dic[txtEnglish.Text]; 
} else { 
MessageBox .Show("       " ); 
} 
} 
private void Form1_Load( object sender, EventArgs e) { 
string [] filecon = File .ReadAllLines( "    TXT  .txt" , Encoding .Default);//    abandon v.  ，   
for (int i = 0; i < filecon.Count(); i++) { 
string [] arr = filecon[i].Split(new char[] { ' ' }, StringSplitOptions .RemoveEmptyEntries); 
if (!dic.ContainsKey(arr[0])) { 
dic.Add(arr[0], arr[1]); 
} 
} 
} 
} 
}