following code segment.[ServiceContract]public interface ICustomerService{...}public class CustomerService : ICustomerService{...}The service is self-hosted in a console application. Older client applications access the service at http://contoso.com:8080/CustomerService/V1.Newer client applications access the service at http://contoso.com:8080/CustomerService/V2.You need to ensure that any client application can access the service at either address.Which code segment should you use?（）A.B.C.D.
following code segment.[ServiceContract]public interface ICustomerService{...}public class CustomerService : ICustomerService{...}The service is self-hosted in a console application. Older client applications access the service at http://contoso.com:8080/CustomerService/V1.Newer client applications access the service at http://contoso.com:8080/CustomerService/V2.You need to ensure that any client application can access the service at either address.Which code segment should you use?（）
A.
B.
C.
D.
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下面程序的结果是 ______。includeclass A{ public:virtual voidfun()=0{};};class 下面程序的结果是 ______。 #include＜iostream.h＞ class A{ public: virtual void fun()=0{}; }; class B:public A{ public: void fun () {cout＜＜ "new file" ;} }; class C: public A{ public: void fun (){cout＜＜"open file"＜＜ " " } }; class D: public A{ public: void fun () {cout＜＜ "save file\n" ;} }; void main() { A a,*p; B b; C c; D d; p=c; p-＞fun (); p=b; p-＞fun (); p=d; p-＞fun(); }A．new file open file save fileB．new file new file new fileC．编译出错D．open file new file save file
阅读以下说明和Java程序，填写程序中的空（1）～（6），将解答写入答题纸的对应栏内。【说明】以下Java代码实现一个简单绘图工具，绘制不同形状以及不同颜色的图形。部分接口、类及其关系如图5－1所示。【Java代码】interface?DrawCircle?{? //绘制圆形 public（1） ；}class?RedCircle?implements?DrawCircle?{? ?//绘制红色圆形???????public?void?drawCircle(int?radius,intx,?int?y)??{????????????System.out.println("Drawing?Circle[red,radius:"?+?radius?+",x:"?+?x?+?",y:"?+y+?"]");???????}}class?GreenCircle?implements?DrawCircle?{????//绘制绿色圆形??????public?void?drawCircle(int?radius,?int?x,int?y)?{???????????System.out.println("Drawing?Circle[green,radius:"?+radius+",x:?"?+x+?",y:?"?+y+?"]");??????}}abstract?class?Shape?{????//形状? protected? ? （2）???;? ? public?Shape(DrawCircle?drawCircle)?{? ?this.drawCircle=?drawCircle;? ? ? public?abstract?void?draw();}class?Circle?extends?Shape?{? //圆形? ?private?int?x,y,radius;? public?Circle(int?x,int?y,intradius,DrawCircle?drawCircle)?{? ?（3）???;? this.x?=?x;? ? ? this.y?=?y;? ?this.radius?=radius;? }? ? ?public?void?draw()?{? ? drawCircle.? ?（4）? ?;? ? ? }}public?class?DrawCircleMain?{? public?static?void?main(String[]?args)?{? Shape?redCircle＝new?Circle(?100,100,10,? （5） )；//绘制红色圆形? Shape?greenCircle＝new?Circle(200,200,10,（6） )；//绘制绿色圆形? ?redCircle.draw(); greenCircle.draw();? ?}}
下列说法中,不正确的是（)A.一个接口interface源程序经过编译后,得到的文件的扩展名一定是.class#B.一个java源程序编译通过后，得到的文件的扩展名一定是.class#C.一个java源程序可以有多个 class类定义，源文件的名字与public class的类名相同，且只能有一个public类，如果没有public类，源文件的名字必须与第一个类的类名相同，扩展名必须是.java#D.一个java源程序可以包含多个class类