电脑绝技教你22天学精Csharp之第二十天基础加强总复习 补充4

mudanv

06面向对象练习

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace _06面向对象练习

{

class Program

{

static void Main(string[] args)

{

//作业：定义父亲类Father(姓lastName,财产property,血型bloodType),

//儿子Son类(玩游戏PlayGame方法),女儿Daughter类(跳舞Dance方法)，

//调用父类构造函数(:base())给子类字段赋值

//Son son = new Son("张三",10m,"AB");

//son.PlayGame();

//son.SayHello();

//Daughter d = new Daughter("张梅梅", 100m, "O");

//d.SayHello();

//d.Dance();

//Console.ReadKey();

//作业：定义汽车类Vehicle属性（brand(品牌),color（颜色））方法run，

//子类卡车(Truck) 属性weight载重 方法拉货，轿车 (Car) 属性passenger载客数量 方法载客

//Truck truck = new Truck("解放牌卡车", "绿色", 30000);

//Car car = new Car("奔驰", "黑色", 5);

//truck.LaHuo();

//car.LaKe();

//Console.ReadKey();

}

}

///

/// 汽车的父类

///

public class Vehicle

{

public string Brand

{

get;

set;

}

public string Color

{

get;

set;

}

public void Run()

{

Console.WriteLine("我是汽车我会跑");

}

public Vehicle(string brand, string color)

{

this.Brand = brand;

this.Color = color;

}

}

public class Truck : Vehicle

{

public double Weight

{

get;

set;

}

public Truck(string brand, string color, double weight)

: base(brand, color)

{

this.Weight = weight;

}

public void LaHuo()

{

Console.WriteLine("我最多可以拉{0}KG货物",this.Weight);

}

}

public class Car : Vehicle

{

public int Passenger

{

get;

set;

}

public Car(string brand, string color, int passenger)

: base(brand, color)

{

this.Passenger = passenger;

}

public void LaKe()

{

Console.WriteLine("我最多可以拉{0}个人",this.Passenger);

}

}

public class Father

{

private string _lastName;

public string LastName

{

get { return _lastName; }

set { _lastName = value; }

}

private decimal _property;

public decimal Property

{

get { return _property; }

set { _property = value; }

}

private string _bloodType;

public string BloodType

{

get { return _bloodType; }

set { _bloodType = value; }

}

public Father(string lastName, decimal property, string bloodType)

{

this.LastName = lastName;

this.Property = property;

this.BloodType = bloodType;

}

public void SayHello()

{

Console.WriteLine("我叫{0},我有{1}元，我是{2}型血",this.LastName,this.Property,this.BloodType);

}

}

public class Son : Father

{

public Son(string lastName, decimal property, string bloodType)

: base(lastName, property, bloodType)

{

}

public void PlayGame()

{

Console.WriteLine("儿子会玩游戏");

}

}

public class Daughter : Father

{

public Daughter(string lastName, decimal property, string bloodType)

: base(lastName, property, bloodType)

{

}

public void Dance()

{

Console.WriteLine("女儿会跳舞");

}

}

}

07面向对象多态练习

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace _07面向对象多态练习

{

class Program

{

static void Main(string[] args)

{

//作业:员工类、部门经理类 程序猿类

//（部门经理也是员工，所以要继承自员工类。员工有上班打卡的方法。用类来模拟。

Employee emp = new Programmer();//new Manager();//new Employee();

emp.DaKa();

Console.ReadKey();

}

}

public class Employee

{

public virtual void DaKa()

{

Console.WriteLine("员工九点打卡");

}

}

public class Manager : Employee

{

public override void DaKa()

{

Console.WriteLine("经理十一点打卡");

}

}

public class Programmer : Employee

{

public override void DaKa()

{

Console.WriteLine("程序猿不打卡");

}

}

}

08面向对象多态练习

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace _08面向对象多态练习

{

class Program

{

static void Main(string[] args)

{

//作业:动物Animal 都有吃Eat和叫Bark的方法，狗Dog和猫Cat叫的方法不一样.

//父类中没有默认的实现所哟考虑用抽象方法。

Animal a = new Dog();//new Cat();

a.Bark();

a.Eat();

Console.ReadKey();

}

}

public abstract class Animal

{

public abstract void Eat();

public abstract void Bark();

}

public class Cat : Animal

{

public override void Eat()

{

Console.WriteLine("猫咪舔着吃");

}

public override void Bark()

{

Console.WriteLine("猫咪喵喵的叫");

}

}

public class Dog : Animal

{

public override void Bark()

{

Console.WriteLine("狗狗旺旺的叫");

}

public override void Eat()

{

Console.WriteLine("狗狗咬着吃");

}

}

}

09面向对象接口练习

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace _09面向对象接口练习

{

class Program

{

static void Main(string[] args)

{

//作业:鸟-麻雀sparrow['sp?r?u] ，鸵鸟ostrich['?strit?] ，

//企鹅penguin['pengwin] ，鹦鹉parrot['p?r?t]

//鸟能飞,鸵鸟，企鹅不能。。。你怎么办

IFlyable fly = new YingWu();// new QQ();//new YingWu();//new MaQue();

fly.Fly();

Console.ReadKey();

}

}

public interface IFlyable

{

void Fly();

}

public class Bird

{

public double Wings

{

get;

set;

}

public void SayHello()

{

Console.WriteLine("我是小鸟");

}

}

public class MaQue : Bird, IFlyable

{

public void Fly()

{

Console.WriteLine("麻雀会飞");

}

}

public class TuoNiao : Bird

{

}

public class QQ : Bird

{

}

public class YingWu : Bird, IFlyable

{

public void Fly()

{

Console.WriteLine("鹦鹉会飞");

}

}

}

10面向对象多态练习

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace _10面向对象多态练习

{

class Program

{

static void Main(string[] args)

{

//作业:橡皮rubber鸭子、木wood鸭子、真实的鸭子realduck。

//三个鸭子都会游泳，而橡皮鸭子和真实的鸭子都会叫，

//只是叫声不一样，橡皮鸭子“唧唧”叫，真实地鸭子“嘎嘎”叫，木鸭子不会叫.

//IBark bark = new RealDuck();//new XPDuck();

//bark.Bark();

XPDuck xp = new XPDuck();

MuDuck md = new MuDuck();

RealDuck rd = new RealDuck();

IBark bark = rd;

Duck duck = rd;

duck.Swim();

bark.Bark();

Console.ReadKey();

}

}

public class Duck

{

public virtual void Swim()

{

Console.WriteLine("是鸭子就会游泳");

}

}

public interface IBark

{

void Bark();

}

public class RealDuck : Duck, IBark

{

public void Bark()

{

Console.WriteLine("这的鸭子嘎嘎叫");

}

public override void Swim()

{

Console.WriteLine("真的鸭子会游泳");

}

}

public class MuDuck:Duck

{

public override void Swim()

{

Console.WriteLine("木头鸭子也会游泳");

}

}

public class XPDuck : Duck, IBark

{

public void Bark()

{

Console.WriteLine("橡皮鸭子唧唧叫");

}

public override void Swim()

{

Console.WriteLine("橡皮鸭子也会游泳");

}

}

}

11、抽象类练习

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace _11_抽象类练习

{

class Program

{

static void Main(string[] args)

{

//作业：计算形状Shape(圆Circle，矩形Square ，正方形Rectangle)的面积、周长

Shape shape = new Square(5,7);//new Circle(5);

double area = shape.GetArea();

double perimeter = shape.GetPerimeter();

Console.WriteLine(area);

Console.WriteLine(perimeter);

Console.ReadKey();

}

}

public abstract class Shape

{

public abstract double GetArea();

public abstract double GetPerimeter();

}

public class Square : Shape

{

public double Height

{

get;

set;

}

public double Width

{

get;

set;

}

public Square(double height, double width)

{

this.Height = height;

this.Width = width;

}

public override double GetArea()

{

return this.Height * this.Width;

}

public override double GetPerimeter()

{

return (this.Height + this.Width) * 2;

}

}

public class Circle : Shape

{

public double R

{

get;

set;

}

public Circle(double r)

{

this.R = r;

}

public override double GetArea()

{

return Math.PI * this.R * this.R;

}

public override double GetPerimeter()

{

return 2 * Math.PI * this.R;

}

}

}

12字符串

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace _12字符串

{

class Program

{

static void Main(string[] args)

{

//string s1 = "张三";//GC

//s1 = null;

//if (string.IsNullOrEmpty(s1))

//{

// Console.WriteLine("是的");

//}

//else

//{

// Console.WriteLine("不是");

//}

//string s = "abcdefg";

//char[] chs = s.ToCharArray();

//chs[0] = 'b';

//s = new string(chs);

//Console.WriteLine(s);

////s[0]='b';

//Console.WriteLine(s[0]);

//Console.ReadKey();

//string s1 = "c#";

//string s2="C#";

//if (s1.Equals(s2,StringComparison.OrdinalIgnoreCase))

//{

// Console.WriteLine("相同");

//}

//else

//{

// Console.WriteLine("不相同");

//}

//Console.ReadKey();

//string s = "abcdefg";

//string sNew = s.Substring(3,1);

//Console.WriteLine(sNew);

//Console.ReadKey();

//string str = "abcd , , fd, fdafd [[ ---";

//string[] strNew = str.Split(new char[] { ',', ' ', '[', '-' }, StringSplitOptions.RemoveEmptyEntries);

//string[] names = { "张三", "李四", "王五", "赵六" };

//string s = string.Join("|",'c',true,3.13,100,1000m,"张三");

//Console.WriteLine(s);

//Console.ReadKey();

string str = "老赵伟大";

str = str.Replace("老赵", "**");

Console.WriteLine(str);

Console.ReadKey();

}

}

}

13、字符串练习

using System;

using System.Collections.Generic;

using System.IO;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace _13_字符串练习

{

class Program

{

static void Main(string[] args)

{

//课上练习1：接收用户输入的字符串，将其中的字符以与输入相反的顺序输出。"abc"→"cba"

//string str = "abcdefg";

//char[] chs = new char[str.Length];

//foreach (var item in chs)

//{

// Console.WriteLine(item);

//}

//Console.ReadKey();

//Console.WriteLine("请输入一个字符串");

//string str = Console.ReadLine();

//char[] chs = new char[str.Length];

//int i = 0;

//foreach (var item in str)

//{

// chs = item;

// i++;

//}

//foreach (var item in chs)

//{

// Console.WriteLine(item);

//}

//Console.ReadKey();

//char[] chs = str.ToCharArray();

//for (int i = 0; i < chs.Length/2; i++)

//{

// char temp = chs;

// chs = chs[chs.Length - 1 - i];

// chs[chs.Length - 1 - i] = temp;

//}

//str = new string(chs);

//Console.WriteLine(str);

//Array.Reverse(chs);

//str = new string(chs);

//Console.WriteLine(str);

////课上练习2：接收用户输入的一句英文，将其中的单词以反序输出。 “I love you"→“i evol uoy"

//string str = "I Love You";// I evoL uoY

//string s2 = null;

//string[] strNew = str.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);

//for (int i = 0; i < strNew.Length; i++)

//{

// string s = ProcessStr(strNew);

// s2 += s+" ";

//}

//Console.WriteLine(s2);

//Console.ReadKey();

//课上练习3：”2012年12月21日”从日期字符串中把年月日分别取出来，打印到控制台

//string date = "2012年12月21日";

//string[] dateNew = date.Split(new char[] { '年', '月', '日' }, StringSplitOptions.RemoveEmptyEntries);

//Console.WriteLine("{0}--{1}--{2}",dateNew[0],dateNew[1],dateNew[2]);

//Console.ReadKey();

// 练习5：123-456---789-----123-2把类似的字符串中重复符号去掉，

//既得到123-456-789-123-2. split()、

//string str = "123-456---789-----123-2";

//string[] strNew = str.Split(new char[] { '-' }, StringSplitOptions.RemoveEmptyEntries);

//str = string.Join("-", strNew);

//Console.WriteLine(str);

//Console.ReadKey();

string[] str = File.ReadAllLines("员工工资.txt", Encoding.Default);

int max = int.MinValue;

int min = int.MaxValue;

int sum = 0;

for (int i = 0; i < str.Length; i++)

{

//张三,100

string[] strNew = str.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);

if (int.Parse(strNew[1]) > max)

{

max = int.Parse(strNew[1]);

}

if (int.Parse(strNew[1]) < min)

{

min = int.Parse(strNew[1]);

}

sum += int.Parse(strNew[1]);

}

Console.WriteLine("工资最高是{0},最低是{1},平均薪资是{2}",max,min,sum/str.Length);

Console.ReadKey();

}

public static string ProcessStr(string str)

{

char[] chs = str.ToCharArray();

for (int i = 0; i < chs.Length / 2; i++)

{

char temp = chs;

chs = chs[chs.Length - 1 - i];

chs[chs.Length - 1 - i] = temp;

}

return new string(chs);

}

}

}

14、高效的StringBuilder

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace _14_高效的StringBuilder

{

class Program

{

static void Main(string[] args)

{

StringBuilder sb = new StringBuilder();

sb.Append("张三");

sb.Append("李四");

sb.Append("王五");

sb.Insert(1, 123);

sb.Replace("李四", "颜世伟");

sb.Replace("颜世伟", "杀马特");

Console.WriteLine(sb.ToString());

Console.ReadKey();

}

}

}

15、使用StringBuilder来拼接网页

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

namespace _15_使用StringBuilder来拼接网页

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

private void button1_Click(object sender, EventArgs e)

{

StringBuilder sb = new StringBuilder();

sb.Append("");

sb.Append("");

sb.Append("");

sb.Append("");

sb.Append("");

sb.Append("");

sb.Append("星期一");

sb.Append("星期一");

sb.Append("星期一");

sb.Append("星期一");

sb.Append("");

sb.Append("");

sb.Append("星期一");

sb.Append("星期一");

sb.Append("星期一");

sb.Append("星期一");

sb.Append("");

sb.Append("");

sb.Append("星期一");

sb.Append("星期一");

sb.Append("星期一");

sb.Append("星期一");

sb.Append("");

sb.Append("");

sb.Append("星期一");

sb.Append("星期一");

sb.Append("星期一");

sb.Append("星期一");

sb.Append("");

sb.Append("");

sb.Append("");

sb.Append("");

webBrowser1.DocumentText = sb.ToString();

// webBrowser1.DocumentText

}

}

}

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