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

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、0
  • B、1
  • C、2
  • D、3
  • E、4
  • F、5

相关考题:

通过实现Rmmable接口创建线程,请在下面横线处填写代码完成此程序。public class ThreadTest{public static void main(String args []){Thread testObj1 = new Thread (new Hello ());Thread testObj2 = new Thread (new Hello ());testObj 2.start ( );}}class Hello implements Runnable{int j;public void run(){System.out.println("Hello" + j ++);}}

下列关于Test类的定义中,正确的是______。A) class Test implements Runnabte{public void run(){}public void someMethod(){}B) class Test implements Rnuuable{public void run();}C) class Test implements Rnuuable{public void someMethod();}D) class Test implements Rnuuable{public void someMethod();{}}A.B.C.D.

下列哪个方法可用于创建一个可运行的类? ( )A.public class X implements Runable {public void run(){...,.,}}B.public class X implements Thread {public void run(){......}}C.public class X implements Thread {public int run(){……}}D.public class X implements Runable {protected void run(){.....}}

现有两个类A,B,以下描述中表示B继承自A的是 ( )A.class A extends BB.class B implements AC.class A implements BD.class B extends A

在下面程序的下画线处应填入的选项是 public class Test______{ public static void main(String args[]) { Test t=new Test(); Thread tt=new Thread(t); tt.start(); } public void run() { for(int i=0;i<5;i++) System.out.println("i="+i); } }A.implements RunnableB.extends ThreadC.implements ThreadD.extends Runnable

选择正确的语句填在下列程序的横线处,使程序正常运行。 package ch1; import java. io. *; import j ava. util. *; class C45 implements Seritizable ______Public Thread t = new Thread(new T45(), "t"); public intcnt = 0; public C45() { t. start ( ) class T45 implements Runnable public int[] a = new int[4]; public void run() { for(int i - 0; i < 4; i++) { a[i] - i +4; } } } public class ex45 { static String fileName = "ch1\\file45.txt"; public static void main(String[] args) throws Exception { C45 bj = new C45 (); FileOutputStream fos = new FileOutputStream(fileName); ObjectOutputStream os = new ObjectOutputStream(fos); oos. writeObject (obj); oos.clese (); fos.close (); System. out, println (obj . toString ( ) ); } }A.transientB.protectedC.packageD.final

interface A{int x = 0;}class B{int x =1;}class C extends B implements A {public void pX(){System.out.println(x);}public static void main(String[] args) {new C().pX();}}

下列关于Test类的定义中,正确的是( )。A.class Test implements Runnable{ public void run{} Dublic void someMethod[]{} }B.class Test implements Runnable( puIblic void run; }C.class Test implements Runnable( Dublic void someMethod[]; }D.class Test implements Runnable( public void someMethod{} }

设有如下代码:interface IFace{}class CFace implements IFace{}class Base{}public class ObRef extends Base{public static void main(String argv[]){ObRef bj = new ObRef();Base b = new Base();Object obj1 = new Object();IFace obj2 = new CFace();//Here}}则在 //Here处插入哪个代码将不出现编译和运行错误。A.obj1=obj2;B.b=obj;C.obj=b;D.obj1=b;

( 30 )在程序的下划线处应填入的选项是public class Test _________{public static void main(String args[]){Test t = new Test();Thread tt = new Thread(t);tt.start();}public void run(){for(int i=0;i5;i++){system.out.println( " i= " +i);}}}A ) implements RunnableB ) extends ThreadC ) implements ThreadD ) extends Runnable

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*/ } }

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

interface Animal {  void soundOff();  }  class Elephant implements Animal {  public void soundOff() {  System.out.println(“Trumpet”);  }  }  class Lion implements Animal {  public void soundOff() { System.out.println(“Roar”);  }  }  class Alpha1 {  static Animal get( String choice ) {  if ( choice.equalsIgnoreCase( “meat eater” )) {  return new Lion();  } else {  return new Elephant();  }  }  }  Which compiles?()  A、 new Animal().soundOff();B、 Elephant e = new Alpha1();C、 Lion 1 = Alpha.get(“meat eater”);D、 new Alpha1().get(“veggie”).soundOff();

下列代码正确的是哪项?() A、 public class Session implements Runnable, Clonable{   public void run ();public Object clone () ; }B、 public class Session extends Runnable, Cloneable {  public void run() {/*dosomething*/}       public Object clone() {/*make a copy*/} }C、 public abstract class Session implements Runnable, Clonable {       public void run() {/*do something*/}       public Object clone() {/*make a copy*/}        }D、 public class Session implements Runnable, implements Clonable {       public void run() {/*do something*/}       public Object clone() {/*make a copy*/}       }

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

class Car implements Serializable { }   class Ford extends Car { }   如果试图序列化一个Ford实例,结果为()  A、编译失败B、一个对象被序列化C、两个对象被序列化D、运行时异常被抛出

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

现有:  class ThreadBoth extends Threaa implements Runnable  {      public void run()  (System.out.print("hi");  }     public static voicl main (String  []  args)  {     Thread tl=new ThreadBoth():      Thread t2 = new Thread (tl):     tl.run():      t2.run():     }          结果为:()      A、 hi hiB、 hiC、编译失败D、运行时异常被抛出

import java.io.*;  public class Forest implements Serializable {  private Tree tree = new Tree();  public static void main(String [] args) {  Forest f= new Forest();  try {  FileOutputStream fs = new FileOutputStream(”Forest.ser”);  ObjectOutputStream os = new ObjectOutputStream(fs);  os.writeObject(f); os.close();  } catch (Exception ex) { ex.printStackTrace(); }  }  }  class Tree { }  What is the result?() A、 Compilation fails.B、 An exception is thrown at runtime.C、 An instance of Forest is serialized.D、 A instance of Forest and an instance of Tree are both serialized.

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

You work as the application developer at Hi-Tech.com. You create a new custom dictionary named MyDictionary. Choose the code segment which will ensure that MyDictionary is type safe?()A、 Class MyDictionary Implements Dictionary (Of String,String)B、 Class MyDictionary Inherits HashTableC、 Class MyDictionary Implements IDictionaryD、 Class MyDictionary End Class Dim t as New Dictionary (Of String, String) Dim dict As MyDIctionary= CType (t,MyDictionary)

单选题interface Animal {  void soundOff();  }  class Elephant implements Animal {  public void soundOff() {  System.out.println(“Trumpet”);  }  }  class Lion implements Animal {  public void soundOff() { System.out.println(“Roar”);  }  }  class Alpha1 {  static Animal get( String choice ) {  if ( choice.equalsIgnoreCase( “meat eater” )) {  return new Lion();  } else {  return new Elephant();  }  }  }  Which compiles?()A new Animal().soundOff();B Elephant e = new Alpha1();C Lion 1 = Alpha.get(“meat eater”);D new Alpha1().get(“veggie”).soundOff();

单选题import java.io.*;  public class Forest implements Serializable {  private Tree tree = new Tree();  public static void main(String [] args) {  Forest f= new Forest();  try {  FileOutputStream fs = new FileOutputStream(”Forest.ser”);  ObjectOutputStream os = new ObjectOutputStream(fs);  os.writeObject(f); os.close();  } catch (Exception ex) { ex.printStackTrace(); }  }  }  class Tree { }  What is the result?()A Compilation fails.B An exception is thrown at runtime.C An instance of Forest is serialized.D A instance of Forest and an instance of Tree are both serialized.

单选题class Car implements Serializable { }   class Ford extends Car { }   如果试图序列化一个Ford实例,结果为()A编译失败B一个对象被序列化C两个对象被序列化D运行时异常被抛出

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

单选题You work as the application developer at Hi-Tech.com. You create a new custom dictionary named MyDictionary. Choose the code segment which will ensure that MyDictionary is type safe?()A Class MyDictionary Implements Dictionary (Of String,String)B Class MyDictionary Inherits HashTableC Class MyDictionary Implements IDictionaryD Class MyDictionary End Class Dim t as New Dictionary (Of String, String) Dim dict As MyDIctionary= CType (t,MyDictionary)

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*/ } }