daily exercise - object oriented

最新推荐文章于 2020-08-02 11:36:41 发布

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原文链接：http://www.cnblogs.com/syringa-flz/archive/2007/04/11/709022.html

本文介绍了面向对象编程的三大特性：封装、继承与多态，并通过具体示例详细解释了每种特性的应用方式及其带来的好处。同时，文章还探讨了一些面向对象设计中常见的问题和解决方案。

Daily exercise (Object Oriented)

//encapsulation :Only leave behind the interface for client and hide the member of the class by get/write method or property.

//encapsulation example

public class Person

{

private string _name;

public string Name

{

get

{

Return _name;

}

set

{

_name=value;

}

Question1: Which method is better between using attribute and encapsulation method?

Question2:When we will must use index ?

Question3:Can we get the value like Name if we will get it in AjaxMethod ?

//Inheritance :The class can use other class’s member.

//Inheritance example

public class ParentClass

{

public ParentClass()

{

Console.WriteLine(“ParentClass”);

}

public void Print()

{

Console.WriteLine(“This is a parent class”);

}

public class ChildClass:ParentClass

{

Public ChildClass()

{

Console.WriteLine(“ChildClass”);

}

public class App

{

public static void Main(string[] args)

{

ChildClass child=new ChildClass();

Child.Print();

}

Question4:What’s the number of the class we can inherit most?

Question5:What’s the number of the level we can inherit most?

Question6:Which is better between abstract class and interface?

Question7:Usually,which is used more times between abstract class and interface?

//Polymorphism : Use new or override to rewrite base class’s member.

//Polymorphism example

public class Log
{
   public virtual void Write();
}
public class EventLog:Log
{
   public override void Write()
   {
      Console.WriteLine("EventLog write sucess !");
   }
}
public class FileLog:Log
{
   public override void Write()
   {
      Console.WriteLine("FileLog write sucess !");
   }
}

Question8:What’s the different between the next code if I change it?

public abstract class Log
{
public abstract void Write();
}

public class Log
{
public virtual void Write();
}

Question9: Is it true if I write the code like this?

Public class Log

{

Public abstract void Write();

}

Question10:Can I write the method like this : public abstract override void Write();

Question11:When we use the keywords ‘new’?

Question12:What’s the different between ‘public sealed override void Write()’ and ‘public new void Write()’?

Question13:What is the advantage if I use ‘base.Write();’?

Question14:Can I write the code like this ?

Public abstract class Log

{

Public virtual void Write();

}

Public class FileLog:Log

{

Public new void Write();

}

Question15: What’s the result we can get?

ChildClass child=new ChildClass();

Child.Write();

ParentClass parent=(ParentClass)child;

Parent.Write();

Question16:What we can get if write the code like this ‘ParentClass parent=new ChildClass();’?

Question17:When we could use sealed?

Question18:Can I write the code like this : public sealed void Write();?

Question19:If I define the method with virtual in base class, Is it necessary to inherite it in child class ?

Question20: Which method is helpful for me to abstract the object in project?

转载于:https://www.cnblogs.com/syringa-flz/archive/2007/04/11/709022.html