关于《关于一道C#上机题的一点想法》
看了《关于一道C#上机题的一点想法》和《泛型委托》两篇文章,深有感触,用面向对象的思想解决这个题目:17个人围成一圈,从第一个人开始报数,报到3的退出,一直到剩下最后一个人,用面向对象的思想去做这道题。
看了《关于一道C#上机题的一点想法》和《泛型委托》两篇文章,深有感触,还是关于下面这道题:
第一篇仅是构建了一个双向循环链表数据结构,思想还是面向过程的。
第二篇用到了泛型委托,但是思想和特定技术是不相关的,用到泛型委托未必就是面向对象啊。
所以我也斗胆写了下这道题,请大家指教了:
首先说明,这里用到了状态模式,单例模式,主要还是状态模式,实现了一个简单的状态机,
先上图:
![](https://images.cnblogs.com/cnblogs_com/hongyin163/2009-08-27_131618.jpg)
再上代码:
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
First
1
using System;
2
using System.Collections.Generic;
3
using System.Text;
4![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
5
namespace Test
6![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
{
7
class First:IPersonState
8![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
9![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
IPersonState 成员#region IPersonState 成员
10![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
11
public void Handle()
12![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
13
throw new Exception("The method or operation is not implemented.");
14
}
15![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
16
#endregion
17![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
18![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
IPersonState 成员#region IPersonState 成员
19![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
20![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
21
public void Handle(Person person)
22![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
23
if (person.Next != person)
24![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
25
person.Next.State = new Second();
26
PersonLink.Instance.RootPerson = person.Next;
27
person.Next.Call();
28
}
29
else
30![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
31
person.Next.State = new Last();
32
person.Next.Call();
33
}
34
}
35![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
36
#endregion
37
}
38
}
39![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
Second
1
using System;
2
using System.Collections.Generic;
3
using System.Text;
4![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
5
namespace Test
6![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
{
7
class Second:IPersonState
8![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
9![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
IPersonState 成员#region IPersonState 成员
10![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
11
public void Handle()
12![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
13
throw new Exception("The method or operation is not implemented.");
14
}
15![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
16
#endregion
17![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
18![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
IPersonState 成员#region IPersonState 成员
19![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
20![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
21
public void Handle(Person person)
22![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
23
if (person.Next != person)
24![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
25
person.Next.State = new Three();
26
PersonLink.Instance.RootPerson = person.Next;
27
person.Next.Call();
28
}
29
else
30![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
31
person.Next.State = new Last();
32
person.Next.Call();
33
}
34
}
35![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
36
#endregion
37
}
38
}
39![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
Three
1
using System;
2
using System.Collections.Generic;
3
using System.Text;
4![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
5
namespace Test
6![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
{
7
class Three:IPersonState
8![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
9![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
IPersonState 成员#region IPersonState 成员
10![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
11
public void Handle()
12![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
13
throw new Exception("The method or operation is not implemented.");
14
}
15![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
16
#endregion
17![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
18![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
IPersonState 成员#region IPersonState 成员
19![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
20![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
21
public void Handle(Person person)
22![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
23
24
Console.WriteLine(person.Val);
25
person.Prev.Next = person.Next;
26
person.Next.Prev = person.Prev;
27
PersonLink.Instance.RootPerson = person.Next;
28
if (PersonLink.Instance.RootPerson.Next == PersonLink.Instance.RootPerson)
29![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
30
person.Next.State = new Last();
31
}
32
else
33![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
34
person.Next.State = new First();
35
}
36
person.Next.Call();
37
}
38
#endregion
39![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
40
41
}
42
}
43![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
Last
1
using System;
2
using System.Collections.Generic;
3
using System.Text;
4
using System.Threading;
5![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
6
namespace Test
7![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
{
8
class Last:IPersonState
9![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
10![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
IPersonState 成员#region IPersonState 成员
11![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
12
public void Handle()
13![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
14
throw new Exception("The method or operation is not implemented.");
15
}
16![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
17
public void Handle(Person person)
18![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
19
Console.WriteLine("The last "+person.Val.ToString());
20
Thread.Sleep(20000);
21
}
22![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
23
#endregion
24
}
25
}
26![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
Person
1
using System;
2
using System.Collections.Generic;
3
using System.Text;
4![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
5
namespace Test
6![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
{
7
class Person
8![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
9
private IPersonState _state = null;
10![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
11
public IPersonState State
12![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
13
get
14![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
15
return _state;
16
}
17
set
18![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
19
this._state = value;
20
}
21
}
22
private Person _pre=null;
23
private Person _next=null;
24
private int _val = 1;
25![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
26
public Person Prev
27![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
28![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
get
{ return _pre; }
29![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
set
{ _pre = value;}
30
}
31![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
32![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
public Person Next
{
33![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
get
{ return _next; }
34![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
set
{ _next = value; }
35
}
36![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
public int Val
{
37![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
get
{ return _val; }
38![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
set
{ _val = value; }
39
}
40![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
41![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
public Person()
{ }
42
public Person( Person pre,Person next, int val)
43![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
44
Next = next;
45
Val = val;
46
Prev = pre;
47
}
48
public void Call()
49![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
50
this.State.Handle(this);
51
}
52
}
53
}
54![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
PersonLink
1
using System;
2
using System.Collections.Generic;
3
using System.Text;
4![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
5
namespace Test
6![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
{
7
class PersonLink
8![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
9
private int count = 0;
10
private Person root = null;
11
public Person RootPerson
12![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
13
get
14![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
15
if (root == null)
16![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
17
root = new Person(null,null, 1);
18
}
19
return root;
20
}
21
set
22![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
23
root = value;
24
}
25
}
26![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
27
public static PersonLink Instance
28![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
29
get
30![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
31
if (_instance == null)
32![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
33
_instance = new PersonLink();
34
}
35
return _instance;
36
}
37
}
38
private static PersonLink _instance = null;
39
40
public PersonLink()
41![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
42![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
43
}
44
45
public void InitLink(int count)
46![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
47
this.count = count;
48
//初始化数据
49
Person temp = this.RootPerson;
50
for (int i = 2; i <= count; i++)
51![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
52
Person p = new Person(temp,null, i);
53
temp.Next = p;
54
temp = p;
55
}
56
temp.Next =this.RootPerson;
57
RootPerson.Prev = temp;
58
}
59
60![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
61
internal void Start()
62![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
63
this.RootPerson.State = new First();
64
this.RootPerson.Call();
65
}
66
67
}
68
}
69![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
调用:![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
Program
1
using System;
2
using System.Collections.Generic;
3
using System.Text;
4![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
5
namespace Test
6![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
{
7
class Program
8![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
9
static void Main(string[] args)
10![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
11
PersonLink.Instance.InitLink(17);
12
PersonLink.Instance.Start();
13
}
14
}
15
}
16
题目:17个人围成一圈,从第一个人开始报数,报到3的退出,一直到剩下最后一个人,用面向对象的思想去做这道题。
前面两篇感觉上还是不够面向对象,至少要有面向对象三大特征:封装,继承,多态吧,第一篇仅是构建了一个双向循环链表数据结构,思想还是面向过程的。
第二篇用到了泛型委托,但是思想和特定技术是不相关的,用到泛型委托未必就是面向对象啊。
所以我也斗胆写了下这道题,请大家指教了:
首先说明,这里用到了状态模式,单例模式,主要还是状态模式,实现了一个简单的状态机,
先上图:
![](https://images.cnblogs.com/cnblogs_com/hongyin163/2009-08-27_131618.jpg)
再上代码:
1 using System;
2 using System.Collections.Generic;
3 using System.Text;
4
5 namespace Test
6 {
7 interface IPersonState
8 {
9 void Handle();
10
11 void Handle(Person person);
12 }
13 }
14
2 using System.Collections.Generic;
3 using System.Text;
4
5 namespace Test
6 {
7 interface IPersonState
8 {
9 void Handle();
10
11 void Handle(Person person);
12 }
13 }
14
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
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1
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2
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3
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4
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5
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7
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8
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9
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1
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2
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3
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4
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5
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7
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8
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9
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10
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![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
53
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
54
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
55
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
56
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
57
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
58
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
59
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
60
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
61
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
62
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](https://www.cnblogs.com/Images/dot.gif)
63
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
64
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
65
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
66
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
67
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
68
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
69
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
调用:
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
1
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
2
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
3
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
4
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
5
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
6
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](https://www.cnblogs.com/Images/dot.gif)
7
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
8
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](https://www.cnblogs.com/Images/dot.gif)
9
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
10
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](https://www.cnblogs.com/Images/dot.gif)
11
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
12
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
13
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
14
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
15
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
16
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
运行结果:
源代码:/Files/hongyin163/Test.rar
不知道大家感觉怎样?