集合类List与Dictonary实例练习

a、List<>泛型集合


代码如下:

View Code
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:

View Code
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:

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


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


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


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]);
}
}
}
}
}