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下面的代码使用了面向对象的什么特性?() public class A{ public void DoSomething(){} } public class B : A{ new public void DoSomething(){ base.DoSomething();} }
A.继承性
B.多态性
C.封装性
D.关联性
参考答案和解析
PHP;JAVA;C++;C#
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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();
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阅读下列说明和 Java 代码,将应填入(n)处的字句写在答题纸的对应栏内。
【说明】
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【说明】
???? 生成器(Builder)模式的意图是将一个复杂对象的构建与它的表示分离,使得同样的构建过程可以创建不同的表示。图5-1所示为其类图。
?
【C++代码】
#include
#include
using namespace std;
class Product {
private:?
string partA, partB;
public:?
Product() {?? }? ?
void setPartA(const string}
???? void setPartB(const string}? ?
//? 其余代码省略
};
class Builder {
public:? ? ??
(1)??
;?
virtual void buildPartB()=0;? ? ?
(2)??
;
};
class ConcreteBuilder1 : public Builder {
private:?
Product*?? product;
public:
ConcreteBuilder1() {product = new Product();???? }
void buildPartA() {????? (3)???? ("Component
A"); }?
void buildPartB() {????? (4)???? ("Component
B"); }??
Product* getResult() { return product; }
//? 其余代码省略
};
class ConcreteBuilder2 : public Builder {? ??? ? ? ?
/*??? 代码省略??? */
};
class Director {
private:? ??
Builder* builder;
public:??
Director(Builder* pBuilder) { builder= pBuilder;}? ??
void construct() {
????????????????? (5)???? ;
?????????????? //? 其余代码省略? ?
}??
//? 其余代码省略
};
int main() {? ? ??
Director* director1 = new Director(new ConcreteBuilder1());? ?
director1->construct();? ? ??
delete director1;? ? ?
return 0;
【Java代码】
import jav(6)A.util.*;
class Product {? ? ? ?
private String partA;? ? ? ?
private String partB;? ? ? ??
public Product() {}? ? ??
public void setPartA(String s) { partA = s; }? ? ? ?
public void setPartB(String s) { partB = s; }
}
interface Builder {? ?
public?????? (1)???? ;? ??
public void buildPartB();? ? ??
public?????? (2)???? ;
}
class ConcreteBuilder1 implements Builder {? ? ? ?
private Product product;? ? ? ?
public ConcreteBuilder1() { product = new Product();?? }? ? ? ??
public void buildPartA() {????????
(3)??
("Component A"); }
public void buildPartB() {???? ????(4)?? ("Component B"); }? ? ??
public Product getResult() { return product;}
}
class ConcreteBuilder2 implements Builder {?? ? ? ? ?
//? 代码省略
}
class Director {? ? ? ?
private Builder builder;? ? ? ?
public Director(Builder builder) {this.builder = builder; }
public void construct() {
? ? ? ? ? ? ? ? ? (5)???? ;
? ? ? ? ? ? ? //? 代码省略? ? ??
}
}
class Test {? ? ??
public static void main(String[] args) {
???????????????? Director director1 = new
Director(new ConcreteBuilder1());
???????????????? director1.construct();? ? ? ??
}
考题
public class SomeException { } Class a: public class a { public void doSomething() { } } Class b: public class b extends a { public void doSomething() throws SomeException { } } Which is true about the two classes?() A、 Compilation of both classes will fail.B、 Compilation of both classes will succeed.C、 Compilation of class a will fail. Compilation of class b will succeed.D、 Compilation of class a will fail. Compilation of class a will succeed.
考题
1. public interface A { 2. public void doSomething(String thing); 3. } 1. public class AImpl implements A { 2. public void doSomething(String msg) { } 3. } 1. public class B { 2. public A doit() { 3. // more code here 4. } 5. 6. public String execute() { 7. // more code here 8. } 9. } 1. public class C extends B { 2. public AImpl doit() { 3. // more code here 4. } 5. 6. public Object execute() { 7. // more code here 8. } 9. } Which statement is true about the classes and interfaces in the exhibit?() A、 Compilation will succeed for all classes and interfaces.B、 Compilation of class C will fail because of an error in line 2.C、 Compilation of class C will fail because of an error in line 6.D、 Compilation of class AImpl will fail because of an error in line 2.
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 X { public X aMethod() { return this;} } public class Y extends X { } Which two methods can be added to the definition of class Y?()A、 public void aMethod() {}B、 private void aMethod() {}C、 public void aMethod(String s) {}D、 private Y aMethod() { return null; }E、 public X aMethod() { return new Y(); }
考题
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*/} }
考题
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*/} }
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
单选题public class SomeException { } Class a: public class a { public void doSomething() { } } Class b: public class b extends a { public void doSomething() throws SomeException { } } Which is true about the two classes?()A
Compilation of both classes will fail.B
Compilation of both classes will succeed.C
Compilation of class a will fail. Compilation of class b will succeed.D
Compilation of class a will fail. Compilation of class a will succeed.
考题
多选题Which two allow the class Thing to be instantiated using new Thing()?Apublic class Thing { }Bpublic class Thing { public Thing() {} }Cpublic class Thing { public Thing(void) {} }Dpublic class Thing { public Thing(String s) {} }Epublic class Thing { public void Thing() {} public Thing(String s) {} }
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