【1】什么是状态模式？不同的状态，不同的行为。或者说，每个状态有着相应的行为。【2】状态模式的代码示例：代码示例：

#include 
     
      #include 
      
       using namespace std;class Work;class State;class ForenonnState;class State{public:    virtual void writeProgram(Work*) = 0;};class Work{public:    int hour;    State *current;    Work();    void writeProgram()    {        current->writeProgram(this);    }};class EveningState : public State{public:    void writeProgram(Work *w)    {        cout << "当前时间: " << w->hour << "心情很好，在看《明朝那些事儿》，收获很大！" << endl;    }};class AfternoonState : public State{public:    void writeProgram(Work *w)    {        if (w->hour < 19)        {            cout << "当前时间: " << w->hour << "下午午睡后，工作还是精神百倍!" << endl;        }        else        {            w->current = new EveningState();            w->writeProgram();        }    }};class ForenonnState : public State{public:    void writeProgram(Work *w)    {        if (w->hour < 12)        {            cout << "当前时间: " << w->hour << "上午工作精神百倍!" << endl;        }        else        {            w->current = new AfternoonState();            w->writeProgram();        }    }};Work::Work(){    current = new ForenonnState();}int main(){    Work *w = new Work();    w->hour = 21;    w->writeProgram();    return 0;}//Reuslt://当前时间: 21心情很好，在看《明朝那些事儿》，收获很大！
      
     

http://www.cnblogs.com/Braveliu/p/3946826.html