嚴風(fēng)吹霜海草凋，筋干精堅胡馬驕。
漢家戰(zhàn)士三十萬，將軍兼領(lǐng)霍嫖姚。
流星白羽腰間插，劍花秋蓮光出匣。
天兵照雪下玉關(guān)，虜箭如沙射金甲。
云龍風(fēng)虎盡交回，太白入月敵可摧。
敵可摧，旄頭滅，履胡之腸涉胡血。
懸胡青天上，埋胡紫塞旁。
胡無人，漢道昌。

 #define ADVANEING   0
#define ASSAULTING  1
#define RESTING      2
Class Army
{
Private:
int m_iState;
int m_iEmptyCout;
public:
Army():m_iState(RESTING){}
Void Advance();
Void Assault();
Void Rest();
};
Void Army::Advance()
{
If (m_iState ==  ADVANEING   )
{
Cout << “Are Advaning!” << endl;
}
Eles if ( m_iState == ASSAULTING )
{
Cout << “sorry! Are assauling!Can’t Advace” << endl;
}
Else if( m_iState == RESTING )
{
m_iState = ADVANING
Cout << “ok!Go!” << endl;
}
}
Void Army:: Assault ()
{
If (m_iState ==  ADVANEING   )
{
m_iEmptyCout = 100;
m_iState == ASSAULTING;
Cout << “ok!Assault!” << endl;
}
Eles if ( m_iState == ASSAULTING )
{
m_iEmptyCount -= 100;
Cout << “Are assauling!” << endl;
}
Else if( m_iState == RESTING )
{
m_iEmptyCout = 100;
m_iState = ASSAULTING;
Cout << “ok! Assault!” << endl;
}
}
Void Army:: Rest ()
{
If (m_iState ==  ADVANEING   )
{
m_iState == RESTING;
Cout << “ok!Rest!” << endl;
}
Eles if ( m_iState == ASSAULTING )
{
Cout << “Are assauling!can’t Rest” << endl;
}
Else if( m_iState == RESTING )
{
Cout << “Are Resing!” << endl;
}
}

 class State
{
public:
virtual void Advance() = 0;
virtual void Assault() = 0;
virtual void Rest() = 0;
virtual void Fiesta() = 0;
};

class AdvanceState : public State
{
private:
Army *m_pArmy;
public:
AdvanceState(Army *pArmy);
virtual void Advance();
virtual void Assault();
virtual void Rest() ;
virtual void Fiesta();
};
我們再來看一下AdvanceState的具體實現(xiàn)：
AdvanceState::AdvanceState(Army *pArmy):m_pArmy(pArmy){}
void AdvanceState::Advance()
{
cout << "Be in Advancing!" << endl;
}
void AdvanceState::Assault()
{
//設(shè)置假想的敵人數(shù)
m_pArmy->SetEmptyCount(200);
cout << "Ok!Assault!" << endl;
m_pArmy->SetState(m_pArmy->GetAssaultState());
}
void AdvanceState::Rest()
{
cout << "OK!Rest!" << endl;
m_pArmy->SetState(m_pArmy->GetRestState());
}
void AdvanceState::Fiesta()
{
cout << "sorry!can‘t Fiesta!" << endl;
}

 class State;
class Army
{
private:
State* m_pState;
//保存各個狀態(tài)指針便于使用，當(dāng)有新的狀態(tài)填加的時候，我們也需要在此處添加
State* m_pAdvanceState;
State* m_pAssaultState;
State* m_pRestState;
State* m_pFiestaState;
int m_iEmptyCount;
public:
Army();
void SetState(State *pState);
State* GetAdvanceState();
State* GetAssaultState();
State* GetRestState();
State* GetFiestaState();
void Advance();
void Assault();
void Rest();
void Fiesta();
void SetEmptyCount(int iEmptyCount){m_iEmptyCount = iEmptyCount;}
int GetEmptyCount(){return m_iEmptyCount;}
};

 Army::Army()
{
m_pAdvanceState = new AdvanceState(this);
m_pAssaultState = new AssaultState(this);
m_pRestState = new RestState(this);
m_pFiestaState = new FiestaState(this);
m_pState = m_pRestState;
m_iEmptyCount = 0;
}
void Army::SetState(State *pState)
{
m_pState = pState;
}
State* Army::GetAdvanceState() {return m_pAdvanceState;}
State* Army::GetAssaultState() {return m_pAssaultState;}
State* Army::GetRestState() {return m_pRestState;}
State* Army::GetFiestaState() {return m_pFiestaState;}
void Army::Advance() {m_pState->Advance();}
void Army::Assault() {m_pState->Assault();}
void Army::Rest() {m_pState->Rest();}
void Army::Fiesta() {m_pState->Fiesta();}

 int main(int argc, char* argv[])
{
Army army;
army.Advance();
army.Assault();
army.Rest();
army.Fiesta();
army.Assault();
army.Assault();
army.Rest();
army.Fiesta();
system("pause");
return 0;
}

參考書目：
1， 設(shè)計模式——可復(fù)用面向?qū)ο筌浖幕A(chǔ)（Design Patterns ——Elements of Reusable Object-Oriented Software） Erich Gamma 等著 李英軍等譯  機械工業(yè)出版社
2， Head First Design Patterns（影印版）Freeman等著 東南大學(xué)出版社
3， 道法自然——面向?qū)ο髮嵺`指南    王詠武 王詠剛著  電子工業(yè)出版社
4， 史記    網(wǎng)上找到的電子檔