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单选题
public class Pet{  public void speak(){   System.out.print(“ Pet ”);  }  }   public class Cat extends Pet{  public void speak(){   System.out.print(“ Cat ”);  }  }   public class Dog extends Pet{  public void speak(){   System.out.print(“ Dog ”);  }  }   执行代码   Pet[] p = {new Cat(),new Dog(),new Pet()};   for(int i=0;i〈p.length;i++)   p[i].speak();   后输出的内容是哪项?()
A

Pet Pet Pet

B

Cat Cat Cat

C

Cat Dog Pet

D

Cat Dog Dog


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更多 “单选题public class Pet{  public void speak(){   System.out.print(“ Pet ”);  }  }   public class Cat extends Pet{  public void speak(){   System.out.print(“ Cat ”);  }  }   public class Dog extends Pet{  public void speak(){   System.out.print(“ Dog ”);  }  }   执行代码   Pet[] p = {new Cat(),new Dog(),new Pet()};   for(int i=0;i〈p.length;i++)   p[i].speak();   后输出的内容是哪项?()A Pet Pet PetB Cat Cat CatC Cat Dog PetD Cat Dog Dog” 相关考题
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(){}}

考题 如下程序的输出结果是______。 include using namespace std; class Pet{ char nam 如下程序的输出结果是______。include<iostream>using namespace std;class Pet{char name[10];public:Pet(char*nanle){strcpy(this->name,name);}const char*getName( )const{return name;}virtual void call( )eonst=0;};class Dog:public Pet{public:Dog(char*name):Pet(name){ }void call( )eonst{cout<<"汪汪叫";}};class Cat:public Pet{public:Cat(char*name):Pet(name){ }void call( )const{eout<<"喵喵叫";}};int main( ){Pet*petl=new Dog("哈克"),*pet2=new Cat("吉米");eout<<petl->getName( );petl->call( );eout<<endl;cout<<pet2->getName( );pet2->call( );eout<<endl;return 0;}

考题 有如下程序: include using namespace std; class Pet{ char name[10]; public: Pet(c 有如下程序:include<iostream>using namespace std;class Pet{char name[10];public:Pet(char*name){strcpy(this->name,name);}const char*getName()const {return name;}virtual void call()const=0;};class Dog:public Pet{public:Dog(char*name):Pet(name){}void call()const{cout<<"汪汪叫":}};class Cat:public Pet{public:Cat(char*name):Pet(name){}void call()const{cout<<"喵喵叫";}};int main(){Pet*pet1=new Dog("哈克"),*pet2=new Cat("吉米");cout<<pet1->getName();pet1->call();cout<<end1;cout<<pet2->getName();pet2->call();cout<<end1;return 0;}程序的输出结果是______。

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{pubilc abstract void speak( );}D.public abstract class Animal{pubile abstract void speak( ){};}

考题 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{};}

考题 以下程序的运行结果为?class ValHold{public int i = 10;}public class ObParm{public static void main(String argv[]){ObParm o = new ObParm();o.amethod();}public void amethod(){int i = 99;ValHold v = new ValHold();v.i=30;another(v,i);System.out.print( v.i );}public void another(ValHold v, int i){i=0;v.i = 20;ValHold vh = new ValHold();v = vh;System.out.print(v.i);System.out.print(i);}}A.10030B. 20030C. 209930D. 10020

考题 class One {  public One() { System.out.print(1); }  }  class Two extends One {  public Two() { System.out.print(2); }  }  class Three extends Two {  public Three() { System.out.print(3); }  }  public class Numbers{  public static void main( String[] argv) { new Three(); }  }  What is the result when this code is executed?() A、 1B、 3C、 123D、 321E、 The code rims with no output.

考题 public class Pet{     private String name;     public Pet(){  System.out.print(1);    }  public Pet(String name){        System.out.print(2);    } }  public class Dog extends Pet{     public Dog(String name){        System.out.print(3);    } }  执行new Dog(“棕熊”);后程序输出是哪项?() A、 23B、 13C、 123D、 321

考题 public class Pet{     private String name;     public Pet(String name){       this.name = name;    }  public void speak(){     System.out.print(name); }  }  public class Dog extends Pet{     public Dog(String name){       super(name);    }  public void speak(){    super.speak();  System.out.print(“ Dog ”);    } }  执行代码   Pet pet = new Dog(“京巴”);  pet.speak();  后输出的内容是哪项?() A、 京巴B、 京巴 DogC、 nullD、 Dog京巴

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 Which two allow the class Thing to be instantiated using new Thing()?A、 public class Thing { }B、 public class Thing { public Thing() {} }C、 public class Thing { public Thing(void) {} }D、 public class Thing { public Thing(String s) {} }E、 public class Thing { public void Thing() {} public Thing(String s) {} }

考题 public class Pet{   private String name;   public Pet(){   System.out.print(1);  }   public Pet(String name){   System.out.print(2);  }   }   public class Dog extends Pet{  public Dog(String name){   //这里隐藏了一句代码:super.pet();   System.out.print(3);  }   }   执行new Dog(“棕熊”);后程序输出是哪项?() A、 23B、 1 3C、 123D、 321

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考题 public class Pet{   private String name;   public Pet(){   System.out.print(1);  }   public Pet(String name){   System.out.print(2);   }  }   public class Dog extends Pet{  public Dog(){   System.out.print(4);  }   public Dog(String name){   //这里隐藏了一句代码:super.pet();   this();   System.out.print(3);  }  }   执行new Dog(“棕熊”);后程序输出是哪项?() A、 143B、 423C、 243D、 1134

考题 public class Pet{  public void speak(){   System.out.print(“ Pet ”);  }  }   public class Cat extends Pet{  public void speak(){   System.out.print(“ Cat ”);  }  }   public class Dog extends Pet{  public void speak(){   System.out.print(“ Dog ”);  }  }   执行代码   Pet[] p = {new Cat(),new Dog(),new Pet()};   for(int i=0;i〈p.length;i++)   p[i].speak();   后输出的内容是哪项?()  A、Pet Pet PetB、Cat Cat CatC、Cat Dog PetD、Cat Dog Dog

考题 public class X {  public static void main(String [] args) {  try {  badMethod();  System.out.print(“A”);  }  catch (RuntimeException ex) {  System.out.print(“B”);  }  catch (Exception ex1) {  System.out.print(“C”);  }   finally {  System.out.print(“D”);  }  System.out.print(“E”);  }  public static void badMethod() {  throw new RuntimeException();  }  }  What is the result?()  A、 BDB、 BCDC、 BDED、 BCDEE、 ABCDEF、 Compilation fails.

考题 public class Pet{     private String name;     public Pet(){  System.out.print(1);    }  public Pet(String name){        System.out.print(2);    } }  public class Dog extends Pet{     public Dog(){  System.out.print(4);    }  public Dog(String name){        this();  System.out.print(3);    } }  执行new Dog(“棕熊”);后程序输出是哪项?()  A、 143B、 423C、 243D、 1134

考题 单选题public class X {  public static void main(String [] args) {  try {  badMethod();  System.out.print(“A”);  }  catch (RuntimeException ex) {  System.out.print(“B”);  }  catch (Exception ex1) {  System.out.print(“C”);  }   finally {  System.out.print(“D”);  }  System.out.print(“E”);  }  public static void badMethod() {  throw new RuntimeException();  }  }  What is the result?()A  BDB  BCDC  BDED  BCDEE  ABCDEF  Compilation fails.

考题 单选题public class Pet{   private String name;   public Pet(){   System.out.print(1);  }   public Pet(String name){   System.out.print(2);  }  }   public class Dog extends Pet{  public Dog(){   System.out.print(4);  }   public Dog(String name){   super(name);   System.out.print(3);  }   }   执行new Dog(“棕熊”);后程序输出是哪项?()A  33B  13C  23D  123

考题 单选题public class Pet{     private String name;     public Pet(){  System.out.print(1);    }  public Pet(String name){        System.out.print(2);    } }  public class Dog extends Pet{     public Dog(String name){        System.out.print(3);    } }  执行new Dog(“棕熊”);后程序输出是哪项?()A  23B  13C  123D  321

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class One {  public One() { System.out.print(1); }  }  class Two extends One {  public Two() { System.out.print(2); }  }  class Three extends Two {  public Three() { System.out.print(3); }  }  public class Numbers{  public static void main( String[] argv) { new Three(); }  }  What is the result when this code is executed?()A  1B  3C  123D  321E  The code rims with no output.

考题 单选题public class X {  public static void main(String [] args) {  try {  badMethod();  System.out.print(“A”);  }  catch (Exception ex) {  System.out.print(“B”);  }  finally {  System.out.print(“C”);  }  System.out.print(“D”);  }  public static void badMethod() {  throw new RuntimeException();  }  }  What is the result? ()A  ABB  BCC  ABCD  BCDE  Compilation fails.

考题 单选题public class Pet{   private String name;   public Pet(){   System.out.print(1);  }   public Pet(String name){   System.out.print(2);  }   }   public class Dog extends Pet{  public Dog(String name){   //这里隐藏了一句代码:super.pet();   System.out.print(3);  }   }   执行new Dog(“棕熊”);后程序输出是哪项?()A  23B  1 3C  123D  321

考题 单选题public class Pet{     private String name;     public Pet(String name){       this.name = name;    }  public void speak(){     System.out.print(name); }  }  public class Dog extends Pet{     public Dog(String name){       super(name);    }  public void speak(){    super.speak();  System.out.print(“ Dog ”);    } }  执行代码   Pet pet = new Dog(“京巴”);  pet.speak();  后输出的内容是哪项?()A  京巴B  京巴 DogC  nullD  Dog京巴

考题 单选题public class X {  public static void main(String [] args) {  try {  badMethod();  System.out.print(“A”); }  catch (Exception ex) {  System.out.print(“B”);  }  finally {  System.out.print(“C”);  }  System.out.print(“D”);  }   public static void badMethod() {} }  What is the result?()A  ACB  BDC  ACDD  ABCDE  Compilation fails.

考题 单选题下列程序的运行结果是(  )。class Shape{ public Shape(){ System.out.print("Shape"); }}class Circle extends Shape{ public Circle(){ System.out.print("Circle"); }}public class Test{ public static void main(String[]args){ Shape d=new Circle(); }}A ShapeB CircleC ShapeCircleD 程序有错误