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(TraficControIS,stem)在红灯时控制各类车辆(Vehicle)的通行,其类图如图6-1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 Vehiclepublic Vehicle () { }abstract void run};interface Emergency {(1) ;(2) ;}class Car extends Vehicle {public Car () { }void run () { /*代码略*/ }};class Truck extends Vehicle {public Truck () { }void run () { /*代码略*/ }class PoliceCar (3)boolean isEmergency = false;public PoliceCar () { }public PoliceCar(boolean b) { this . isEmergency =b; }public boolean isEmergent () { return (4); }public void runRedLight () { /*代码略*/ }}/*类Ambulance. FireEngine实现代码略*/public class TraficControISystem {/。交通控制类。/private Vehicle[ ]V=new Vehiele [24];int numVehicles;public void control() {for (int i=0; inumVehicles; i++) {if (v[i] instanceof Enu rgency ((Emergency)V [i])isEmergent()) {( 5 ) . runRedLigh: ( ) ;}else(6).run( )}}void add (Vehicle vehicle) { v[numVehicles++]=vehicle;)/*添加车辆*/void shutDown()(/*代码略*/}public static void main (Stri.ng [ ] args) {TraficControlSystem 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 () ;}}
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(TraficControIS,stem)在红灯时控制各类车辆(Vehicle)的通
行,其类图如图6-1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 {
(1) ;
(2) ;
}
class Car extends Vehicle {
public Car () { }
void run () { /*代码略*/ }
};
class Truck extends Vehicle {
public Truck () { }
void run () { /*代码略*/ }
class PoliceCar (3)
boolean isEmergency = false;
public PoliceCar () { }
public PoliceCar(boolean b) { this . isEmergency =b; }
public boolean isEmergent () { return (4); }
public void runRedLight () { /*代码略*/ }
}
/*类Ambulance. FireEngine实现代码略*/
public class TraficControISystem {/。交通控制类。/
private Vehicle[ ]V=new Vehiele [24];
int numVehicles;
public void control() {
for (int i=0; i<numVehicles; i++) {
if (v[i] instanceof Enu rgency&& ((Emergency)V [i])
isEmergent()) {
( 5 ) . runRedLigh&39;: ( ) ;
}else
(6).run( )
}
}
void add (Vehicle vehicle) { v[numVehicles++]=vehicle;)/*添加车辆*/
void shutDown()(/*代码略*/}
public static void main (Stri.ng [ ] args) {
TraficControlSystem 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 () ;
}
}