阅读以下说明和Java代码,填充程序中的空缺,将解答填入答题纸的对应栏内。 [

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问题 阅读以下说明和Java代码,填充程序中的空缺,将解答填入答题纸的对应栏内。[说明]某应急交通控制系统(TraficControlSystem)在红灯时控制各类车辆(Vehicle)的通行,其类图如下图所示,在紧急状态下应急车辆在红灯时可通行,其余车辆按正常规则通行。下面的Java代码实现以上设计,请完善其中的空缺。[Java代码]abstract class Vehicle{public Vehicle(){  }abstract void run();};interface Emergency{   ______;   ______;};class Car extends Vehicle{public Car(){  }void run(){ /*代码略*/  }};Class Truck extends Vehicle{public Truck(){  }void run() {  /*代码略*/  }};class PoliceCar ______ {boolean isEmergency= false;public PoliceCar(){  }public PoliceCar(boolean b) {this.isEmergency=b;    }public boolean isEmergent(){  return ______   }public void runRedLight(){    /*代码略*/  }};/*类Ambulance、FireEngine实现代码略*/public class TraficControlsystem  {  /*交通控制类*/private Vehicle[]V=new Vehicle[24];int numVehicles;public void control(){for {int i=0;  i<numVehicles; i++){if(Vinstanceof Emergency&&((Emergency)v).isEmergent()){(______).runRedLight();}else______. run();}}void add(Vehicle vehicle){  v[numVehicles++]=vehicle;}/*添加车辆*/void shutDown(){/*代码略*/}public static void main(String[]args){TraficC0ntrolSystem tcs=new TraficControlSystem();tcs.add(new Car());tcs.add(new PoliceCar());tcs.add(new Ambulance());tcs.add(new Ambulance(true));tcs.add(new FireEngine(true));tcs.add(new Truck());tcs.add(new FireEngine());tcs.control();tcs.shutDown();}}

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答案

解析 boolean isEmergent()
void runRedLight()
extends Car implements Emergency
this.isEmergency
(Emergency)v
v
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