publicabstractclassAnimal{publicabstractvoidEat();publicvoidSleep(){}}以下关于C#代码地描述正确的是()。
第1题:
以下关于C#代码的说法正确的是()publicabstractclassAnimal{publicabstractvoidEat();publicvoidSleep(){}}
A、代码编译错误,因为类中方法没有实现
B、代码编译错误,因为类中存在非抽象方法
C、该段代码正确
D、通过代码”Animalan=newAnimal();”可以创建一个Animal对象
第2题:
在下列源代码文件Test.java中, ( )是正确的类定义。
A.public class test{
B.public class Test{ public int x=0;public int x=0; public test (intx) public Test (int x){ {this.x=x; this.x=x;} }} }
C.public class Test extends T1,T2{
D.protected class Test extends T2{ public int=0;public int x=0; public Test(int x){Public Test (int x){ this.x=x;this.x=x: }} }}
第3题:
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{ public abstract void speak();}
D.public abstract class Animal{ public abstract void speak(){}}
第4题:
Which three demonstrate an “is a” relationship?()
第5题:
在下列源代码文件Test.java中,哪个选项是正确的类定义? ( )
A.public class test { public int x=0; public test(int x) { this.x=x; } }
B.public class Test { public int x=0; public Test(int x) { this.x=x; } }
C.public class Test extends Ti,T2 { public int x=0; public Test(int x) { this.x=x; } }
D.protected class Test extends T2 { public int x=0; public Test(int x) { this.x=x; } }
第6题:
写出程序的输出结果
public abstract class A
{
public A()
{
Console.WriteLine('A');
}
public virtual void Fun()
{
Console.WriteLine("A.Fun()");
}
}
public class B: A
{
public B()
{
Console.WriteLine('B');
}
public new void Fun()
{
Console.WriteLine("B.Fun()");
}
public static void Main()
{
A a = new B();
a.Fun();
}
}
第7题:
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{};}
第8题:
A.public class test { public int x = 0; public test(int x) { this.x = x; } }
B.public class Test{ public int x=0; public Test(int x) { this.x = x; } }
C.public class Test extends T1, T2 { public int x = 0; public Test (int x) { this.x = x; } }
D.public class
第9题:
下列哪些是方法public int add (int a)的重载方法?()
第10题:
interface Data { public void load(); } abstract class Info { public abstract void load(); } Which class correctly uses the Data interface and Info class?()