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軟件設(shè)計(jì)師案例分析每日一練試題內(nèi)容(2025/2/15)
閱讀下列說明和C++代碼,將應(yīng)填入 (n) 處的字句寫在答題紙的對(duì)應(yīng)欄內(nèi)。
【說明】
某燈具廠商欲生產(chǎn)一個(gè)燈具遙控器,該遙控器具有7個(gè)可編程的插槽,每個(gè)插槽都有開關(guān)按鈕,對(duì)應(yīng)著一個(gè)不同的燈。利用該遙控器能夠統(tǒng)一控制房間中該廠商所有品牌燈具的開關(guān),現(xiàn)采用Command(命令)模式實(shí)現(xiàn)該遙控器的軟件部分。Command模式的類圖如圖1-1所示。

【C++代碼】
class Light {
public:
Light(string name) { /* 代碼省略 */ }
void on() { /* 代碼省略 */ } // 開燈
void off() { /* 代碼省略 */ } // 關(guān)燈
};
class Command {
public:
(1) ;
};
class LightOnCommand:public Command { // 開燈命令
private:
Light* light;
public:
LightOnCommand(Light* light) { this->light=light; }
void execute() { (2) ; }
};
class LightOffCommand:public Command { // 關(guān)燈命令
private:
Light *light;
public:
LightOffCommand(Light* light) { this->light=light; }
void execute() { (3) ; }
};
class RemoteControl{ // 遙控器
private:
Command* onCommands[7];
Command* offCommands[7];
public:
RemoteControl() { /* 代碼省略 */ }
void setCommand(int slot, Command* onCommand, Command* offCommand) {
(4) =onCommand;
(5) =offCommand;
}
void onButtonWasPushed(int slot) { (6) ; }
void offButtonWasPushed(int slot) { (7) ; }
};
int main() {
RemoteControl* remoteControl=new RemoteControl();
Light* livingRoomLight=new Light("Living Room");
Light* kitchenLight=new Light("kitchen");
LightOnCommand* livingRoomLightOn=new LightOnCommand(livingRoomLight);
LightOffCommand* livingRoomLightOff=newLightOffCommand(livingRoomLight);
LightOnCommand* kitchenLightOn=new LightOnCommand(kitchenLight);
LightOffCommand* kitchenLightOff=new LightOffCommand(kitchenLight);
remoteControl->setCommand(0, livingRoomLightOn, livingRoomLightOff);
remoteControl->setCommand(1, kitchenLightOn, kitchenLightOff);
remoteControl->onButtonWasPushed(0);
remoteControl->offButtonWasPushed(0);
remoteControl->onButtonWasPushed(1);
remoteControl->offButtonWasPushed(1);
/* 其余代碼省略 */
return 0;
}
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