下列程序片段中,能通过编译的是( )。
A.public abstract class Animal{ public void speak;}
B.public abstract class Animal{ public void speak{);}
C.public class Animal{ pubilc abstract void speak;}
D.public abstract class Animal{ pubile abstract void speak{};}
有如下程序:ncludeusing namespace std;class Animal{public:virtual char*getType()const{return“Animal”;}virtual char*getVoice()const{return“Voice”;}};class Dog:public Animal{public:char*getType()const{rgturn“Dog”;}char*getVoice()const{retum“Woof”;}};void type(Animal&A){cout<<a.getType();}void speak(AnimalA){cout<<a.getVoice();}int main(){Dog d.type(D);tout<<“speak”;speak(D);cout<<endl;return 0;}运行时的输出结果是【 】
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下列______选项不是InputStream类中的方法。A.public abstract int read() throws IOExceptionB.public final void writeInt (int V)throws IOExceptionC.public int available() throws IOExceptionD.public void close() throws IOException
运行下列程序的结果是 ( ) abstract class MineBase { abstract void amethod(); static int i; } public class Mine extends MineBase { public static void main(String argv[]){ int[]ar=new int[5]; for(i=0;i<ar.length;i++) System.out.println(ar[i]);A.打印5个0B.编译出错,数组ar[]必须初始化C.编译出错,Mine应声明为abstractD.出现IndexOutOfBoundes的例外
下列程序片段中,能通过编译的是( )。A.public abstract class Animal{public void speak( );}B.public abstract class Animal{public void speak( ){};}C.public class Animal{pubilc abstract void speak( );}D.public abstract class Animal{pubile abstract void speak( ){};}
下面的代码中有什么错误吗?_______using System;class A{public virtual void F(){Console.WriteLine("A.F");}}abstract class B:A{public abstract override void F();
阅读下面程序 public class MyVal { public static void main(String[]args) { MyVal m=new MyVal(); m.amethod(); } public void amethod() { boolean b[]=new Boolean[5]; } } 程序编译或运行的结果是A.1B.nullC.""D.编译不通过
指出下面哪一项是在抽象类中声明一个抽象方法。( )A.public abstract method();B.public abstract void method();C.public void abstract Method();D.public void method(){abstract;}