状态模式实验报告

班级：学号：姓名:

指导教师：成绩：

实验题目：状态模式实验时间：

一、实验目的

练习并掌握状态模式，理解它的适用场景，掌握如何在实际开发过程中使用这个模式，并学会分析这个模式的使用效果。

二、实验内容

图书管理系统中的图书有两种状态：在馆和借出；请用状态模式来实现两种状态的转换。

（1）、类图

（2）、时序图

（3）、实现代码

（4）、测试代码

1、类图

2、时序图

Client Library I nLibrary OutLibrary

1: Loan()

2: SetSate()

3: Loan()

4:

5:

6: Return()

7: SetSate()

8: Return()

9:

10:

3、实现代码

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace ConsoleApplication1

{

class Program

{

public interface State

{

void Loan(); //借¨¨出?的ì?方¤?法¤?§

void Return(); //归¨|还1的ì?方¤?法¤?§

}

//在¨2馆Y状á??态??类¤¨¤

public class InLibraryState:State

{

Library library;

public InLibraryState(Library library)

{

this.library = library;

}

public InLibraryState()

{ }

public void Loan()

{

Console.WriteLine("借¨¨书o¨|成¨|功|了￠?!");

library.bookloan();

library.setState(library .getOutLibrary ());

}

public void Return()

{

Console.WriteLine("图a?书o¨|如¨?今?还1在¨2馆Y中D，ê?操¨′作á??有?D误¨?"); }

}

//借¨¨出?状á??态??类¤¨¤

public class OutLibraryState:State

{

Library library;

public OutLibraryState(Library library)

{

this.library = library;

}

public OutLibraryState()

{ }

public void Loan()

{

Console.WriteLine("图a?书o¨|如¨?今?借¨¨出?了￠?，ê?操¨′作á??有?D误¨?"); }

public void Return()

{

Console.WriteLine("还1书o¨|成¨|功|了￠?");

library.bookreturn();

library.setState(library .getInLibrary ());

}

}

//图a?书o¨|馆Y类¤¨¤

public class Library

{

State inlibrary;

State outlibrary;

State state ;

int Count = 0;

public Library(int bookCount)

{

inlibrary = new InLibraryState(this);

outlibrary = new OutLibraryState(this);

this.Count = bookCount;

if (bookCount > 0)

{

state = inlibrary;

}

}

public void Loan()

{

state.Loan();

}

public void Return()

{

state.Return();

}

public void setState(State state)

{

this.state =state;

}

public State getInLibrary()

{

return inlibrary ;

}

public State getOutLibrary()

{

return outlibrary;

}

public int getbookCount()

{

return Count;

}

public void bookloan()

{

if (Count != 0)

{

Count = Count-1;

}

}

public void bookreturn()

{

Count = Count + 1;

}

public void print(Library library)

{

if (library.getbookCount() > 0)

{

Console.WriteLine("图a?书o¨|如¨?今?在¨2图a?书o¨|馆Y中D"); }

else

{

Console.WriteLine("图a?书o¨|已°?被à?借¨¨出?");

Console.ReadKey();

}

}

}

4、测试代码

class test

{

static void Main(string[] args)

{

Library library = new Library(1);

library.Loan();

library.print(library);

library.Return();

library.print(library);

Console.WriteLine("**************************************");

library.Loan();

library.Loan();

library.print(library); library.Return();

library.Return();

library.print(library); }

}

5、测试显示结果图