下列代码的编译或执行结果是( )。 public class Myval{ public static void main(string args[]){ MyVal m=new MyVal; aMethod; } public void aMethod{ boolean b[]=new Boolean[5]; System.OUt.println(b[0]); } }A.1B.nullC.0D.编译错误
下列代码的编译或执行结果是( )。 public class Myval{ public static void main(string args[]){ MyVal m=new MyVal; aMethod; } public void aMethod{ boolean b[]=new Boolean[5]; System.OUt.println(b[0]); } }
A.1
B.null
C.0
D.编译错误
相关考题:
执行以下代码,输出结果的结果是?()publicclassTest{publicString[]ss=newString[5];publicstaticvoidmain(String[]args){System.out.println(ss[1]);}} A.nullB.-1C.编译时出错D.运行时报错
分析下列代码:ClassA{Publicstaticvoidmain(String[]args){method();}staticvoidmethod(){try{System.out.println(Hello);}finally{System.out.println(good-bye);}}}编译运行后,输出结果是()。 A.HelloB.good-byeC.Hellogod-byeD.代码不能编译
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下列代码的执行结果是( )。 class NextLetter{ public static void main(String[ ]args){ char c="a"; System.out.println("The next character is"+ + + c +"."); } }A.aB.bC.cD.a+c
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
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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;}
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