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

复制代码代码如下:

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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

复制代码代码如下:

View Code
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

复制代码代码如下:

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输出
Console .WriteLine(n.ToString() + 2);//显示为12
//计算字符串中每种字符出现的次数（面试题）。“Welcome to Chinaworld”，不区分大小写，打印“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]);
}
//编写一个函数进行日期转换，将输入的中文日期转换为阿拉伯数字日期，比如：二零一二年十二月月二十一日要转换为2012-12-21。
string date = "二零一二年十二月二十一日" ; //date2的转换需要考虑十左右字符是否都在字典中在则为则十消失如果左边不在右边在则变1 如果左边在右边不在则变0 如果左右都不在则变10 还是蛮复杂的
//string date = "二零一二年二月二一日";
string strNumb = "一1 二2 三3 四4 五5 六6 七7 八8 九9 零0" ;
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('年', '-');
//years.Add('月', '-');
for (int i = 0; i < date.Length; i++) {
if (years.ContainsKey(date[i])) {
nullYear += years[date[i]];
} else if (date[i] == '年' || date[i] == '月' ) {
nullYear += '-' ;
} else if (date[i] == '十' && years.ContainsKey(date[i + 1]) && !years.ContainsKey(date[i - 1])) {
nullYear += '1' ;
} else if (date[i] == '十' && !years.ContainsKey(date[i + 1]) && years.ContainsKey(date[i - 1])) {
nullYear += '0' ;
} else if (date[i] == '十' && !years.ContainsKey(date[i + 1]) && !years.ContainsKey(date[i - 1])) {
nullYear += "10" ;
}
}
Console .WriteLine(nullYear);
Console .ReadKey();
}
}
}

e、泛型集合练习2中日期转换提取为方法

复制代码代码如下:

View Code
using System;
using System.Collections.Generic;
namespace _07_日期Change {
class Program {
static string str = "一1 二2 三3 四4 五5 六6 七7 八8 九9 零0" ;
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 = "二零一二年二月二一日";
string date = "二零一二年二十月二十一日" ;
date = newstr(date);
string nullYear = "" ;
//money.Add('年', '-');
//money.Add('月', '-');
for (int i = 0; i < date.Length; i++) {
if (money.ContainsKey(date[i])) {
nullYear += money[date[i]];
} else if (date[i] == '年' || date[i] == '月' ) {
nullYear += '-' ;
}
}
Console .WriteLine(nullYear);
Console .WriteLine(date);//二零一二年一二月二一日
Console .ReadKey();
}
//十左右字符都在字典中那么十消失如果左边不在右边在则变1 如果左边在右边不在则变0 如果左右都不在则变10
public static string newstr( string str) {
string newstr = "" ;
for (int i = 0; i < str.Length; i++) {
if (str[i] == '十' ) {
bool left = money.ContainsKey(str[i - 1]);
bool right = money.ContainsKey(str[i + 1]);
if (left && right) {
newstr += "" ;
} else if (right) { //!left &&
newstr += "一" ;
} else if (left) { //&& !right
newstr += "零" ;
} else {//if (!left && !right)
newstr += "一零" ;
}
} else {
newstr += str[i];
}
}
return newstr;
}
}
}

f、泛型集合练习之翻译软件

复制代码代码如下:

View Code
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace _05_翻译软件 {
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("请购买新的字典" );
}
}
private void Form1_Load( object sender, EventArgs e) {
string [] filecon = File .ReadAllLines( "英汉词典TXT格式.txt" , Encoding .Default);//格式遵循abandon v.抛弃，放弃
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]);
}
}
}
}
}