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)。

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)。


相关考题:

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(){}}

下列哪个类声明是正确的? ( )A.abstract final class H1 {...}B.abstract private move(){...}C.protected private numberD.public abstract class Car{...}

下列哪个类声明是正确的?A.abstract class G2 extends superClassl,superClass2{……}B.abstract public class classmates{……}C.public final class NewClass extends superClass implements Interfacel{……}D.public abstract class String{……}

Given:10. interface Data { public void load(); }11. abstract class Info { public abstract void load(); }Which class correctly uses the Data interface and Info class?()() A.B.C.D.E.F.

如果有-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.

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();

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)。

以下语句可以通过编译: class am_I_abstract { abstract void method1(); } 。() 此题为判断题(对,错)。

以下语句可以通过编译: abstract class am_I_abstract { abstract void method1(); }。() 此题为判断题(对,错)。

以下程序是正确的。 class IamAbstract { final int f; double d; abstract void method1(); } 。() 此题为判断题(对,错)。

Which will declare a method that is available to all members of the same package and be referenced without an instance of the class?()A、 abstract public void methoda ();B、 public abstract double inethoda ();C、 static void methoda (double dl) {}D、 public native double methoda () {}E、 protected void methoda (double dl) {}

Which declaration prevents creating a subclass of an outer class?()A、 Static class FooBar{}B、 Private class FooBar{}C、 Abstract public class FooBar{}D、 Final public class FooBar{}E、 Final abstract class FooBar{}

interface Data { public void load(); }  abstract class Info { public abstract void load(); }  Which class correctly uses the Data interface and Info class?() A、 public class Employee extends Info implements Data { public void load() { /*do something*/ } }B、 public class Employee implements Info extends Data { public void load() { /*do something*/ } }C、 public class Employee extends Info implements Data { public void load() { /*do something */ } public void Info.load() { /*do something*/ } }D、 public class Employee implements Info extends Data { public void Data.load() { /*dsomething */ } public void load() { /*do something */ } }E、 public class Employee implements Info extends Data { public void load() { /*do something */ } public void Info.load(){ /*do something*/ } }F、 public class Employee extends Info implements Data{ public void Data.load() { /*do something*/ } public void Info.load() { /*do something*/ } }

下列哪个类的声明是正确的()A、abstract final class HI{}B、abstract private move(){}C、protected private number;D、public abstract class Car{}

下列哪个类声明是正确的()。A、abstract final class H1{…}B、abstract private move(){…}C、protected private number;D、public abstract class Car{…}

下列是抽象类的声明的是()A、  abstract class figure{    }B、  class  abstract figure{    }C、  seald class figure{    }D、  static class figure{  }

单选题Which declaration prevents creating a subclass of an outer class?()A Static class FooBar{}B Private class FooBar{}C Abstract public class FooBar{}D Final public class FooBar{}E Final abstract class FooBar{}

单选题现有:  interface Data {public void load();}  abstract class Info {public abstract void load();}      下列类定义中正确使用Data和Info的是哪项?()A public class Employee implements Info extends Data { public void load(){/*dosomething*/}     }Bpublic class Employee extends Inf.implements Data{ public void load() {/*do something*/}     }Cpublic class Empl.yee implements Inf extends Data{ public void Data.1oad(){* do something*/}     public void load(){/*do something*/}     }Dpublic class Employee extends Inf implements Data  {  public void Data.1oad()  {/*do something*/)     public void info.1oad(){/*do something*/}    }

多选题public abstract class Shape {  private int x;  private int y;  public abstract void draw();  public void setAnchor(int x, int y) {  this.x = x;  this.y = y;  }  }  Which two classes use the Shape class correctly?()Apublic class Circle implements Shape { private int radius; }Bpublic abstract class Circle extends Shape { private int radius; }Cpublic class Circle extends Shape { private int radius; public void draw(); }Dpublic abstract class Circle implements Shape { private int radius; public void draw(); }Epublic class Circle extends Shape { private int radius;public void draw() {/* code here */} }Fpublic abstract class Circle implements Shape { private int radius;public void draw() { / code here */ } }

单选题现有:  1. interface Animal {  2. void eat();  3. }  4.  5. // insert code here  6.  7. public class HouseCat extends Feline {  8. public void eat() { }  9. }   和五个声明:  abstract class Feline implements Animal { }  abstract class Feline implements Animal { void eat(); }  abstract class Feline implements Animal { public void eat(); }  abstract class Feline implements Animal { public void eat() { } }  abstract class Feline implements Animal { abstract public void eat(); }  分别插入到第5行,有几个可以通过编译?()A0B1C2D3

多选题abstract class A {  abstract void al();  void a2() { }  }  class B extends A {  void a1() { }  void a2() { }  }  class C extends B { void c1() { } }  and:  A x = new B(); C y = new C(); A z = new C();  Which four are valid examples of polymorphic method calls?()Ax.a2();Bz.a2();Cz.c1();Dz.a1();Ey.c1();Fx.a1();

单选题现有:  interface Animal {       void eat () ;       }       //insert code here       public class HouseCat extends Feline {       public void eat() { }       }  和五个申明  abstract class Feline implements Animal { }  abstract  class  Feline  implements  Animal  {  void eat () ;  }  abstract class Feline implements Animal { public void eat();}  abstract class Feline implements Animal { public void eat() {}  }  abstract class Feline implements Animal { abstract public void eat();} 结果为:()A1B2C3D4

单选题下列是抽象类的声明的是()A  abstract class figure{    }B  class  abstract figure{    }C  seald class figure{    }D  static class figure{  }