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单选题
现有:      1  Interface F{}  2  class A implements F{}      3  class B extends A{}      4  class C extends B{  5    public static void main(String[]  args){      6    B b=new B();  7    //inSert C0de here      8    }      9    } 下列哪行代码插入到第7行,将抛出java.lang.ClassCaseException异常()
A

   A a=b;

B

  F f=  (C)b;

C

  F f=  (A)b;

D

  B bb=  (B)(A)b;


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更多 “单选题现有:      1  Interface F{}  2  class A implements F{}      3  class B extends A{}      4  class C extends B{  5    public static void main(String[]  args){      6    B b=new B();  7    //inSert C0de here      8    }      9    } 下列哪行代码插入到第7行,将抛出java.lang.ClassCaseException异常()A    A a=b;B   F f=  (C)b;C   F f=  (A)b;D   B bb=  (B)(A)b;” 相关考题
考题 给出下面的接口: interface A{ int method1(int i); int method2(int j); } 下面那个类实现了这个接口,并且不是抽象的?() A.class B implements A{ int method1(){} int method2(){} }B.class B { int method1(int i){} int method2(int j){} }C.class B implements A{ int method1(int i){} int method2(int j){} }D.class B extends A{ int method1(int i){} int method2(int j){} }

考题 有一个接口定义如下,下列选项中实现了该接口并且不是抽象的是 interface A { int method1 (int i); int method2 (int j); }A.class B implements A { int method1(){} int method2(){} }B.class B { int method1(int i){} int method2(int j){} }C.class B implements A { int method1(int 1){} int method2(int j){} }D.class B extends A { int method1(int i){} int method2(int j){} }

考题 现有:  1.  interface Animal  f      2.    void eat();      3.    }      4.  5.  // insert code here      6.  7. public class HouseCat implements Feline  {      8.    public void eat()    {  }     9.  }  和以下三个接口声明:  interface Feline extends Animal  (  )  interface Feline extends Animal  {void eat();    }  interface Feline extends Animal  {void eat()    {  }  }   分别插入到第5行,有多少行可以编译?   A、  0B、  1C、  2D、  3

考题 Which three demonstrate an “is a” relationship?() A、 public class X { }  public class Y extends X { }B、 public interface Shape { }  public interface Rectangle extends Shape{ }C、 public interface Color { }  public class Shape { private Color color; }D、 public interface Species { }  public class Animal { private Species species; }E、 public class Person { } public class Employee {  public Employee(Person person) { }F、 interface Component { }  class Container implements Component { private Component[] children; }

考题 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*/ } }

考题 现有:  interface  I  {  void go();  }      abstract class A implements I { }      class C extends A  {     void go(){ }     }  结果是什么?()   A、代码通过编译B、由于第1行的错误导致编译失败C、由于笫3行的错误导致编译失败D、由于第6行的错误导致编译失败

考题 现自:  1.  interface Color {  }      2. interface Weight  {  }      3.  //insert code here    和以下足六个声明:  class Boat extends Color, extends Weight  {  }     class Boat extends Color and Weight  {  }      class Boat extends Color, Weight  {  }  class Boat implements Color,  implements Weight  {  }     class Boat implements Color and Weight  {  }      class Boat implements Color, Weight  {  }    分别插入到第3行,有多少行可以编译? () A、  0B、  1C、  2D、  3

考题 现有:      1  Interface F{}  2  class A implements F{}      3  class B extends A{}      4  class C extends B{  5    public static void main(String[]  args){      6    B b=new B();  7    //inSert C0de here      8    }      9    } 下列哪行代码插入到第7行,将抛出java.lang.ClassCaseException异常()A、   A a=b;B、  F f=  (C)b;C、  F f=  (A)b;D、  B bb=  (B)(A)b;

考题 Which the two demonstrate an “is a” relationship?()A、 public interface Person {}  Public class Employee extends Person {}B、 public interface Shape {}  public interface Rectangle extends Shape {}C、 public interface Color {}  public class Shape { private Color color; }D、 public class Species {}  public class Animal { private Species species; }E、 interface Component {} Class Container implements Component {private Component [] children;

考题 Which two demonstrate an “is a” relationship?()   A、 public interface Person { }  public class Employee extends Person { }B、 public interface Shape { }  public class Employee extends Shape { }C、 public interface Color { }  public class Employee extends Color { }D、 public class Species { }  public class Animal (private Species species;)E、 interface Component { }  Class Container implements Component ( Private Component[ ]children;  )

考题 Given a class whose instances, when found in a collection of objects, are sorted by using the compareTo() method, which two statements are true?()A、The class implements java.lang.Comparable.B、The class implements java.util.Comparator.C、The interface used to implement sorting allows this class to define only one sort sequence.D、The interface used to implement sorting allows this class to define many different sort sequences.

考题 现有:  class Pet implements Serializable  {      Collar c= new Collar();      }  class Collar implements Serializable  {      collarPart cpl=new CollarPart ("handle");      CollarPart cp2=new CollarPart ("clip");      }     class CollarPart implements Serializable()  如果Pet实例被序列化,则多少对象将被序列化?()    A、0B、1C、2D、3E、4F、5

考题 10. interface Foo {}  11. class Alpha implements Foo {}  12. class Beta extends Alpha {}  13. class Delta extends Beta {  14. public static void main( String[] args) {  15. Beta x = new Beta();  16. // insert code here  17. }  18. }  Which code, inserted at line 16, will cause a java.lang.ClassCastException?() A、 Alpha a = x;B、 Foo f= (Delta)x;C、 Foo f= (Alpha)x;D、 Beta b = (Beta)(Alpha)x;

考题 现有:   1. interface Animal {    2.   void eat();   3.  }    4.   5. // insert code here    6.   7. public class HouseCat implements Feline {    8.   public void eat() { }   9. }   和以下三个接口声明:   interface Feline extends Animal { }    interface Feline extends Animal { void eat(); }     interface Feline extends Animal { void eat() { } }    分别插入到第 5 行,有多少行可以编译?()  A、 0B、 1C、 2D、 3

考题 在JAVA中,已定义两个接口B和C,要定义一个实现这两个接口的类,以下语句正确的是()A、 interface A extend B CB、 interface A implements B CC、 class A implements B CD、 class A implements B implements C

考题 单选题现有:   1. interface Animal {    2.   void eat();   3.  }    4.   5. // insert code here    6.   7. public class HouseCat implements Feline {    8.   public void eat() { }   9. }   和以下三个接口声明:   interface Feline extends Animal { }    interface Feline extends Animal { void eat(); }     interface Feline extends Animal { void eat() { } }    分别插入到第 5 行,有多少行可以编译?()A  0B  1C  2D  3

考题 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*/}     }B public class Employee extends Inf.implements Data{ public void load() {/*do something*/}     }C public class Empl.yee implements Inf extends Data{ public void Data.1oad(){* do something*/}     public void load(){/*do something*/}     }D public class Employee extends Inf implements Data  {  public void Data.1oad()  {/*do something*/)     public void info.1oad(){/*do something*/}    }

考题 单选题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*/ } }

考题 单选题现有:  interface  I  {  void go();  }      abstract class A implements I { }      class C extends A  {     void go(){ }     }  结果是什么?()A 代码通过编译B 由于第1行的错误导致编译失败C 由于笫3行的错误导致编译失败D 由于第6行的错误导致编译失败

考题 单选题1. interface DoStuff2 {  2. float getRange(int low, int high); }  3.  4. interface DoMore {  5. float getAvg(int a, int b, int c); }  6.  7. abstract class DoAbstract implements DoStuff2, DoMore { }  8.  9. class DoStuff implements DoStuff2 {  10. public float getRange(int x, int y) { return 3.14f; } }  11.  12. interface DoAll extends DoMore {  13. float getAvg(int a, int b, int c, int d); }  What is the result?()A  The file will compile without error.B  Compilation fails. Only line 7 contains an error.C  Compilation fails. Only line 12 contains an error.D  Compilation fails. Only line 13 contains an error.E  Compilation fails. Only lines 7 and 12 contain errors.F  Compilation fails. Only lines 7 and 13 contain errors.G  Compilation fails. Lines 7, 12, and 13 contain errors.

考题 多选题Which two demonstrate an “is a” relationship?()Apublic interface Person { }  public class Employee extends Person { }Bpublic interface Shape { }  public class Employee extends Shape { }Cpublic interface Color { }  public class Employee extends Color { }Dpublic class Species { }  public class Animal (private Species species;)Einterface Component { }  Class Container implements Component ( Private Component[ ]children;  )

考题 多选题Given a class whose instances, when found in a collection of objects, are sorted by using the compareTo() method, which two statements are true?()AThe class implements java.lang.Comparable.BThe class implements java.util.Comparator.CThe interface used to implement sorting allows this class to define only one sort sequence.DThe interface used to implement sorting allows this class to define many different sort sequences.

考题 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?()A 0B 1C 2D 3

考题 多选题Which the two demonstrate an “is a” relationship?()Apublic interface Person {}  Public class Employee extends Person {}Bpublic interface Shape {}  public interface Rectangle extends Shape {}Cpublic interface Color {}  public class Shape { private Color color; }Dpublic class Species {}  public class Animal { private Species species; }Einterface Component {} Class Container implements Component {private Component [] children;

考题 单选题在JAVA中,已定义两个接口B和C,要定义一个实现这两个接口的类,以下语句正确的是()A  interface A extend B CB  interface A implements B CC  class A implements B CD  class A implements B implements C

考题 单选题现自:  1.  interface Color {  }      2. interface Weight  {  }      3.  //insert code here    和以下足六个声明:  class Boat extends Color, extends Weight  {  }     class Boat extends Color and Weight  {  }      class Boat extends Color, Weight  {  }  class Boat implements Color,  implements Weight  {  }     class Boat implements Color and Weight  {  }      class Boat implements Color, Weight  {  }    分别插入到第3行,有多少行可以编译? ()A   0B   1C   2D   3

考题 单选题现有:  1.  interface Animal  f      2.    void eat();      3.    }      4.  5.  // insert code here      6.  7. public class HouseCat implements Feline  {      8.    public void eat()    {  }     9.  }  和以下三个接口声明:  interface Feline extends Animal  (  )  interface Feline extends Animal  {void eat();    }  interface Feline extends Animal  {void eat()    {  }  }   分别插入到第5行,有多少行可以编译?A   0B   1C   2D   3

考题 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:()A 1B 2C 3D 4