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软件设计师案例分析每日一练试题内容(2025/1/10)
阅读下列说明和Java代码,将应填入 (n) 处的字句写在答题纸的对应栏内。
【说明】
某灯具厂商欲生产一个灯具遥控器,该遥控器具有7个可编程的插槽,每个插槽都有开关灯具的开关,现采用Command(命令)模式实现该遥控器的软件部分。Command模式的类图如图1-1所示。
【Java代码】
class Light {
public Light() {}
public Light(String name) { /* 代码省略 */ }
public void on() { /* 代码省略 */ } // 开灯
public void off() { /* 代码省略 */ } // 关灯
// 其余代码省略
}
(1) {
public void execute();
}
class LightOnCommand implements Command { // 开灯命令
Light light;
public LightOnCommand(Light light) { this.light=light; }
public void execute() { (2) ; }
}
class LightOffCommand implements Command { // 关灯命令
Light light;
public LightOffCommand(Light light) { this.light=light; }
public void execute(){ (3) ; }
}
class RemoteControl { // 遥控器
Command[] onCommands=new Command[7];
Command[] offCommands=new Command[7];
public RemoteControl() { /* 代码省略 */ }
public void setCommand(int slot, Command onCommand, Command offCommand) {
(4) =onCommand;
(5) =offCommand;
}
public void onButtonWasPushed(int slot) {
(6) ;
}
public void offlButtonWasPushed(int slot){
(7) ;
}
}
class RemoteLoader {
public static void main(String[] args) {
RemoteControl remoteControl=new RemoteControl();
Light livingRoomLight=new Light("Living Room");
Light kitchenLight=new Light("kitchen");
LightOnCommand livingRoomLightOn=new LightOnCommand(livingRoomLight);
LightOffCommand livingRoomLightOff=new LightOffCommand(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);
}
}
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信管网cnit**************:
interface command<br>light.on()<br>light.off()<br>oncommands[slot]<br>offcommands[slot]<br>oncommands[slot].excute()<br>offcommands[slot].excute()<br>
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