下面代码的运行结果是( )。 public class ConcatTest { public static void main (String[ ] args) { String str1 = "abc"; String str2 = "ABC"; String str3 = str1. coneat(str2); System. out. println(str3); } }A．abcB．ABCC．abcABCD．ABCabc
下面代码的运行结果是( )。 public class ConcatTest { public static void main (String[ ] args) { String str1 = "abc"; String str2 = "ABC"; String str3 = str1. coneat(str2); System. out. println(str3); } }
A．abc
B．ABC
C．abcABC
D．ABCabc
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下面程序的运行结果是 include class base{ protected: int a; public: base( ) {c 下面程序的运行结果是#include＜iostream.h＞class base{protected:int a;public:base( ) {cout ＜ ＜ "0";}};class base l: virtual base{public:base l ( ) {cout ＜ ＜"1";}};class base 2: virtual base{public:base2 ( ) {cout ＜ ＜"2";}};class derived: public base 1, public base2{public:derived( ) {cout ＜ ＜ "3";}};void main( ){derive obj;cout ＜ ＜ endl;}A．0123B．3120C．0312D．3012
下列程序的运行结果是【 】。 include class SomeClass { public: SomeClass(int va 下列程序的运行结果是【 】。include ＜iostream. h＞class SomeClass{public:SomeClass(int value) { some_value=value;};void show_data(void) { cout＜＜data＜＜"＜＜~some_value＜＜endl; };static void set_data(int value) {data=value; }private:static int data;int some_value};int SomeClass::datavoid main(void){SomeClass my_class(1001),your_class(2002);your_class. set_data(4004);my_elass. show_data()}
下面程序的运行结果是()。includeclass base{protected:int a;public:base(){cout 下面程序的运行结果是( )。 #include＜iostream.h＞ class base{ protected： int a； public： base(){cout＜＜“0”；} }； Class basel：Virtual base{ public： basel(){cout＜＜“1”；} }； Class base2：virtual base{ public： base2(){cout＜＜“2”；)A．0123B．3120C．0312D．3012
阅读下面代码 public class Test { public static void main(String[]args) { System.out.println(2＞0?10:8)； } } 其运行的结果是A．2B．0C．10D．8
阅读下面代码 public class Test { String s="One World One Dream"； public static void main(String[] args) { System.out.println(s)； } } 其运行的结果是A．argsB．World One DreamC．sD．编译时出错
下列程序的运行结果是______。include class Base { public: void f(int x){cout 下列程序的运行结果是______。include＜iostream.h＞class Base{public：void f(int x){cout＜＜“Base：”＜＜x＜＜endl；})；class Derived：public Base{public：void f(char*str){cout＜＜“Derived：”＜＜str＜＜endl；}}；void main(void){Base*pd＝ne
下面程序的运行结果是includeclass base{protected:int a;public:base( ){cout 下面程序的运行结果是 #include＜iostream.h＞ class base{ protected： int a； public： base( ){cout＜＜"0"；} }； class basel：virtual base { public： base1( ){cout＜＜"1"；} }； class base2：virtual base{ public：A．123B．3120C．312D．3012
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();? ?}}
阅读下列说明和C++代码，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C++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。部分类及其关系如图6－1所示。【C++代码】#include?#include?using?namespace?std;class?DrawCircle?{??????//绘制圆形，抽象类? ? ? public: （1）；//定义参数为?int?radius,?int?x,?inty? ?virtual～DrawCircle()?{?}};class?RedCircle：public?DrawCircle?{????//绘制红色圆形? ? ? ? public: void?drawCircle(intradius,?int?x,?int?y)?{cout??drawCircle?=?drawCircle;? }? ?virtual～shape()?{?}? public:? ?virtual?void?draw()?=?0;};class?Circle：public?Shape?{????//圆形? ? private:? ? ?int?x,y,radius;? ? public:? Circle(int?x,inty,int?radius,DrawCircle?*drawCircle)? （3）? {? this->x?=?x;? ?this->y?=?y;? ? this->radius?=?radius; }? ? ? public:? void?draw(){? drawCircle?-> （4）; }};int?main(){Shape?*redCirclenew?Circle(100,100,10,????（5）????);//绘制红色圆形? Shape?*greenCircle＝new?Circle(100,100,10, （6）??);//绘制绿色圆形redCircle >draw();? ?greenCircle?->draw();? ?return?0;}