1.publicclassXimplementsRunnable（2.privateintx；3.privateinty；4.5.publicstaticvoidmain（String[]args）6.Xthat=newX（）；7.（newThread（that））.start（）；8.（newThread（that））.start（）；9.）10.11.publicvoidrun（）（12.for（；；）（13.x++；14.y++；15.System.out.printIn（x=”+x+，y=”+y）

题目

1.publicclassXimplementsRunnable（2.privateintx；3.privateinty；4.5.publicstaticvoidmain（String[]args）6.Xthat=newX（）；7.（newThread（that））.start（）；8.（newThread（that））.start（）；9.）10.11.publicvoidrun（）（12.for（；；）（13.x++；14.y++；15.System.out.printIn（x=”+x+，y=”+y）；16.）17.）Whatistheresult？（）

A.Errorsatlines7and8causecompilationtofail.

B.Theprogramprintspairsofvaluesforxandythatmightnotalwaysbethesameonthesameline（forexample，“x=2，y=1”）.

C.Theprogramprintspairsofvaluesforxandythatarealwaysthesameonthesameline（forexample，“x=1，y=1”.Inaddition，eachvalueappearstwice（forexample，“x=1，y=1”followedby“x=1，y=1”）.

D.Theprogramprintspairsofvaluesforxandythatarealwaysthesameonthesameline（forexample，“x=1，y=1”.Inaddition，eachvalueappearsonlyforonce（forexample，“x=1，y=1”followedby“x=2，y=2”）.

相似考题

1.publicclassXimplementsRunnable（privateintx；privateinty；publicstaticvoidmain（String[]args）（Xthat=newX（）；（newThread（that））.start（）；（newThread（that））.start（）；）publicsynchronizedvoidrun（）（for（；；）（x++；y++；System.out.printIn（x=+x+，y=+y）；）））Whatistheresult？（）A.Anerroratline11causescompilationtofail.B.Errorsatlines7and8causecompilationtofail.C.Theprogramprintspairsofvaluesforxandythatmightnotalwaysbethesameonthesameline（forexample，“x=2，y=1”）D.Theprogramprintspairsofvaluesforxandythatarealwaysthesameonthesameline（forexample，“x=1，y=1”.Inaddition，eachvalueappearstwice（forexample，“x=1，y=1”followedby“x=1，y=1”）E.Theprogramprintspairsofvaluesforxandythatarealwaysthesameonthesameline（forexample，“x=1，y=1”.Inaddition，eachvalueappearstwice（forexample，“x=1，y=1”followedby“x=2s，y=2”）

2.publicclassXimplementsRunnable（privateintx；privateinty；publicstaticvoidmain（Stringargs）（Xthat=newX（）；（newThread（that））.start（）；（newThread（that））.start（）；）publicsynchronizedvoidrun（）（for（；；）（x++；y++；System.out.printIn（x=+x+，y=+y）；）））Whatistheresult？（）A.Anerroratline11causescompilationtofail.B.Errorsatlines7and8causecompilationtofail.C.Theprogramprintspairsofvaluesforxandythatmightnotalwaysbethesameonthesameline（forexample，“x=2，y=1”）D.Theprogramprintspairsofvaluesforxandythatarealwaysthesameonthesameline（forexample，“x=1，y=1”.Inaddition，eachvalueappearstwice（forexample，“x=1，y=1”followedby“x=1，y=1”）E.Theprogramprintspairsofvaluesforxandythatarealwaysthesameonthesameline（forexample，“x=1，y=1”.Inaddition，eachvalueappearstwice（forexample，“x=1，y=1”followedby“x=2s，y=2”）

3.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; 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 () ;}}

4.publicclassXimplementsRunnable{privateintx；privateinty；publicstaticvoidmain（String[]args）{Xthat=newX（）；（newThread（that））.start（）；（newThread（that））.start（）；}publicvoidrun（）{for（；；）{synchronized（this）{x++；y++；}System.out.println（Thread.currentThread（）.getName（）+x=+x+，y=+y）；}}}Whatistheresult？（）A.Compilationfails.B.Theprogramprintspairsofvaluesforxandythatmightnotalwaysbethesameonthesameline（forexample，“x=2，y=1”）.C.Theprogramprintspairsofvaluesforxandythatarealwaysthesameonthesameline（forexample，“x=1，y=1”）. Inaddition，eachvalueappearsonlyonce（forexample，“x=1，y=1”followedby“x=2，y=2”）. Thethreadnameatthestartofthelineshowsthatboththreadsareexecutingconcurrently.D.Theprogramprintspairsofvaluesforxandythatarealwaysthesameonthesameline（forexample，“x=1，y=1”）. Inaddition，eachvalueappearsonlyonce（forexample，“x=1，y=1”followedby“x=2，y=2”）. Thethreadnameatthestartofthelineshowsthatonlyasinglethreadisactuallyexecuting.

参考答案和解析
参考答案：D
更多“publicclassXimplementsRunnable(2.privateintx;3.privateinty;4.5.publicstaticvoidmain(Stri ”相关问题

  • 第1题：

    下列（）方法可用于创建一个可运行的类。

    A．public class X implements Runnable{public void run() {……}}

    B．public class X implements Thread{public void run() {……}}

    C．public class X implements Thread{public int run() {……}}

    D．public class X implements Runnable{protected void run() {……}}


    A

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