此题为判断题(对,错)。
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();}}
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如果有一个类MyFrame是Frame的子类,但它不能被实例化,请写出该类的声明头为( )。A.abstract class Frame. extends MyFrameB.abstract class MyFrame. extends FrameC.class MyFrame. abstract extends FrameD.class Frame. abstract extends MyFrame.
下列哪个类声明是正确的? ( )A.abstract class G2 extends superClass1,superClass2{...}B.abstract public class classmates{...}C.public final class NewClass extends superClass implemnets Interface1{...}D.public abstract class String{...}
下列程序片段中,能通过编译的是( )。 A.public abstract class Animal{ public void speak;}S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{};}
下列哪个类声明是正确的? ( )A.abstract class G2 extends superClass1, superClass2 {…}B.abstract public class classmates{…}C.public final class NewClass extends superClass implemnets Interfacel{…}D.public abstract class String{…}
以下语句能顺利通过编译: abstract class class1 { } public class mainClass { public static void main(String args[]) { class1 cs1=new class1(); } } 。()此题为判断题(对,错)。
设有程序如下: abstract class absclass { abstract void method1(); } class conclass extends absclass { public void method1() { System.out.println("子类");} } public class mainclass { public static void main(String args[]) { absclass ac1=new absclass(); //语句1 absclass ac2=new conclass(); //语句2 ac2.method1(); //语句3 } } 则main()方法中的第一条语句(即语句1)可以顺利通过编译。()此题为判断题(对,错)。