1. class Pizza {  2. java.util.ArrayList toppings;  3. public final void addTopping(String topping) {  4. toppings.add(topping); 5. }  6. }  7. public class PepperoniPizza extends Pizza {  8. public void addTopping(String topping) {  9. System.out.printl

题目

1. class Pizza {  2. java.util.ArrayList toppings;  3. public final void addTopping(String topping) {  4. toppings.add(topping); 5. }  6. }  7. public class PepperoniPizza extends Pizza {  8. public void addTopping(String topping) {  9. System.out.println(”Cannot add Toppings”);  10. }  11. public static void main(String[] args) {  12. Pizza pizza = new PepperoniPizza();  13. pizza.addTopping(”Mushrooms”);  14. }  15. }  What is the result?() 

  • A、 Compilation fails.
  • B、 Cannot add Toppings
  • C、 The code runs with no output.
  • D、 A NullPointerException is thrown in Line 4.

相似考题

3.阅读下列说明和 C++代码,将应填入(n)处的字句写在答题纸的对应栏内。 【说明】 某快餐厅主要制作井出售儿童套餐,一般包括主餐(各类比萨)、饮料和玩具,其餐品种类可能不同,但其制作过程相同。前台服务员(Waiter)调度厨师制作套餐。现采用生成器(Builder) 模式实现制作过程,得到如图 5-1 所示的类图。图5-1 类图 【C++代码】 include<iostream> include <string> using namespace std; class Pizza { private: string parts; public: void setParts(string parts) { this->parts=parts; } string getParts() { return parts; } }; class PizzaBuilder { protected:Pizza* pizza; public: Pizza* getPizza() { retum pizza; } void createNewPizza() { pizza = new Pizza(); } ( 1 ); } class HawaiianPizzaBuilder :public PizzaBuilder { public: void buildParts() { pizza->setParts("cross +mild + ham&pineapple"); } }; class SpicyPizzaBuider: public PizzaBuilder { public: void buildParts() { pizza->setParts("pan baked +hot + ham&pineapple"); } } Class Waiter{ Private: PizzaBuilder* pizzaBuilder; public: void setPizzaBuilder(PizzaBuilder* pizzaBuilder) { /*设置构建器*/ ( 2 ) } Pizza* getPizza() { return pizzaBuilder->getPizza(); } void construct() { /*构建*/ pizzaBuilder->createNewPizza(); ( 3 ) } }; int main(){ Waiter*waiter=new Waiter(); PizzaBuilder*hawaiian pizzabuilder=new HawaiianPizzaBuilder() ( 4 ); ( 5 ); cout<< "pizza: "<< waiter->getPizza()->getParts()<< endl; } 程序的输出结果为: pizza: cross + mild + ham&pineapple

更多“1. class Pizza {”相关问题
  • 第1题:

    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】 某快餐厅主要制作并出售儿童套餐,一般包括主餐(各类比萨)、饮料和玩具,其餐品种类可能不同,但其制作过程相同。前台服务员 (Waiter) 调度厨师制作套餐。现采用生成器 (Builder) 模式实现制作过程,得到如图 6-1 所示的类图。【Java代码】 class Pizza { private String parts; public void setParts(String parts) { this.parts = parts; } public String toString() { return this.parts; } } abstract class PizzaBuilder { protected Pizza pizza; public Pizza getPizza() { return pizza; } public void createNewPizza() { pizza = new Pizza(); } public (1) ; } class HawaiianPizzaBuilder extends PizzaBuilder { public void buildParts() { pizza.setParts("cross + mild + ham&pineapp1e”}; } class SpicyPizzaBuilder extends PizzaBuilder { public void buildParts() { pizza.setParts("pan baked + hot + pepperoni&salami"); } } class Waiter { private PizzaBuilder pizzaBuilder; public void setPizzaBuilder(PizzaBuilder pizzaBuilder) { /*设置构建器*/ ( 2 ) ; } public Pizza getPizza(){ return pizzaBuilder.getPizza(); } public void construct() { /*构建*/ pizzaBuilder.createNewPizza(); ( 3 ) ; } } Class FastFoodOrdering { public static viod mainSting[]args) { Waiter waiter = new Waiter(); PizzaBuilder hawaiian_pizzabuilder = new HawaiianPizzaBuilder(); ( 4 ) ; ( 5 ) ; System.out.println("pizza: " + waiter.getPizza()); } } 程序的输出结果为: Pizza:cross + mild + ham&pineapple


    正确答案:(1)abstract void buildParts();
    (2)this.pizzaBuilder=pizzaBuilder
    (3)pizzaBuilder.buildParts()
    (4)waiter.setPizzaBuilder(hawaiian_pizzabuilder)
    (5)waiter.construct()

  • 第2题:

    Pizza,即比萨饼,意大利式有馅烘饼


    正确答案:正确

  • 第3题:

    1. public class Target {  2. private int i = 0;  3. public int addOne() {  4. return ++i;  5. }  6. }  And:  1. public class Client {  2. public static void main(String[] args) {  3. System.out.println(new Target().addOne());  4. }  5. }  Which change can you make to Target without affecting Client?() 

    • A、 Line 4 of class Target can be changed to return i++;
    • B、 Line 2 of class Target can be changed to private int i = 1;
    • C、 Line 3 of class Target can be changed to private int addOne() {
    • D、 Line 2 of class Target can be changed to private Integer i = 0;

    正确答案:D

  • 第4题:

    Class TestException  1. public class TestException extends Exception {  2. } Class a:  1. public class a {  2.  3. public String sayHello(String name) throws TestException {  4.  5. if(name == null) {  6. throw new TestException();  7. }  8.  9. return “Hello “+ name;  10. }  11.  12. }  A programmer wants to use this code in an application: 45. A a=new A();  46. System.out.println(a.sayHello(”John”));  Which two are true?()

    • A、 Class a will not compile.
    • B、 Line 46 can throw the unchecked exception TestException.
    • C、 Line 45 can throw the unchecked exception TestException.
    • D、 Line 46 will compile if the enclosing method throws a TestException.
    • E、 Line 46 will compile if enclosed in a try block, where TestException is caught.

    正确答案:D,E

  • 第5题:

    1. public class A {  2. void A() {  3. System.out.println(“Class A”);  4. }  5. public static void main(String[] args) {  6. new A();  7. }  8. }  What is the result?()  

    • A、 Class A
    • B、 Compilation fails.
    • C、 An exception is thrown at line 2.
    • D、 An exception is thrown at line 6.
    • E、 The code executes with no output.

    正确答案:E

  • 第6题:

    Pizza,即月饼


    正确答案:错误

  • 第7题:

    单选题
    Which of the following is the best version of the ideas conveyed in sentences 1 and 2 (reproduced below)?My parents used to put olives on everything. Salads, pizza, pasta, chicken, even some desserts.
    A

    (As it is now)

    B

    My parents used to put olives on every- thing; salads, pizza, pasta, chicken, even some desserts.

    C

    My parents used to put olives on every- thing, salads, pizza, pasta, chicken, even some desserts.

    D

    My parents used to put olives on every- thing: salads, pizza, pasta, chicken, and even some desserts.

    E

    My parents used to put olives on every-thing; including salads, pizza, pasta, chicken, even some desserts.


    正确答案: C
    解析:
    第二个句子是句子片段。因为第二个从句含有支持第一个从句的一系列例子,因此这两个句子应用冒号连接。

  • 第8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

    0

    B

    1

    C

    2

    D

    3


    正确答案: D
    解析: 暂无解析

  • 第9题:

    多选题
    1. public class OuterClass {  2. private double d1 = 1.0;  3. // insert code here  4. }  Which two are valid if inserted at line 3?()
    A

    static class InnerOne { public double methoda() { return d1; } }

    B

    static class InnerOne { static double methoda() { return d1; } }

    C

    private class InnerOne { public double methoda() { return d1; } }

    D

    protected class InnerOne { static double methoda() { return d1; } }

    E

    public abstract class InnerOne { public abstract double methoda(); }


    正确答案: C,A
    解析: 暂无解析

  • 第10题:

    单选题
    1. public class A {  2. void A() {  3. System.out.println(“Class A”);  4. }  5. public static void main(String[] args) {  6. new A();  7. }  8. }  What is the result?()
    A

     Class A

    B

     Compilation fails.

    C

     An exception is thrown at line 2.

    D

     An exception is thrown at line 6.

    E

     The code executes with no output.


    正确答案: E
    解析: 暂无解析

  • 第11题:

    多选题
    对于pizza盒子的案例中,下列哪些不是由发明原理得到的创意呢?()
    A

    预先在盒子里加小干燥剂包

    B

    将盒子顶部做成穹顶

    C

    增加透气性,然后将pizza盒放在保温袋中

    D

    制冷型Pizza盒子


    正确答案: D,A
    解析: 暂无解析

  • 第12题:

    单选题
    1. class Pizza {  2. java.util.ArrayList toppings;  3. public final void addTopping(String topping) {  4. toppings.add(topping); 5. }  6. }  7. public class PepperoniPizza extends Pizza {  8. public void addTopping(String topping) {  9. System.out.println(”Cannot add Toppings”);  10. }  11. public static void main(String[] args) {  12. Pizza pizza = new PepperoniPizza();  13. pizza.addTopping(”Mushrooms”);  14. }  15. }  What is the result?()
    A

     Compilation fails.

    B

     Cannot add Toppings

    C

     The code runs with no output.

    D

     A NullPointerException is thrown in Line 4.


    正确答案: B
    解析: 暂无解析

  • 第13题:

    Which of the following is not a business-format franchise?()

    • A、KFC
    • B、Coke-Cola
    • C、McDonald’s
    • D、Pizza Hut

    正确答案:B

  • 第14题:

    对于pizza盒子的案例中,下列哪些不是由发明原理得到的创意呢?()

    • A、预先在盒子里加小干燥剂包
    • B、将盒子顶部做成穹顶
    • C、增加透气性,然后将pizza盒放在保温袋中
    • D、制冷型Pizza盒子

    正确答案:A,B,C

  • 第15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.

    正确答案:C

  • 第16题:

    1. public class a {  2. public void method1() {  3. try {  4. B b=new b();  5. b.method2();  6. // more code here  7. } catch (TestException te) {  8. throw new RuntimeException(te);  9. }  10. }  11. }  1. public class b {  2. public void method2() throws TestException {  3. // more code here  4. }  5. }  1. public class TestException extends Exception {  2. }  Given:  31. public void method() {  32. A a=new a();  33. a.method1();  34. }  Which is true if a TestException is thrown on line 3 of class b?()

    • A、 Line 33 must be called within a try block.
    • B、 The exception thrown by method1 in class a is not required to be caught.
    • C、 The method declared on line 31 must be declared to throw a RuntimeException.
    • D、 On line 5 of class a, the call to method2 of class b does not need to be placed in a try/catch block.

    正确答案:B

  • 第17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、  0
    • B、  1
    • C、  2
    • D、  3

    正确答案:B

  • 第18题:

    1. public class enclosingone (  2. public class insideone{}  3. )  4. public class inertest(  5. public static void main (string[]args)(  6. enclosingone eo= new enclosingone ();  7. //insert code here  8. )  9. )    Which statement at line 7 constructs an instance of the inner class?()  

    • A、 InsideOnew ei= eo.new InsideOn();
    • B、 Eo.InsideOne ei = eo.new InsideOne();
    • C、 InsideOne ei = EnclosingOne.new InsideOne();
    • D、 EnclosingOne.InsideOne ei = eo.new InsideOne();

    正确答案:D

  • 第19题:

    判断题
    Pizza,即月饼
    A

    B


    正确答案:
    解析: 暂无解析

  • 第20题:

    单选题
    1. public class a {  2. public void method1() {  3. try {  4. B b=new b();  5. b.method2();  6. // more code here  7. } catch (TestException te) {  8. throw new RuntimeException(te);  9. }  10. }  11. }  1. public class b {  2. public void method2() throws TestException {  3. // more code here  4. }  5. }  1. public class TestException extends Exception {  2. }  Given:  31. public void method() {  32. A a=new a();  33. a.method1();  34. }  Which is true if a TestException is thrown on line 3 of class b?()
    A

     Line 33 must be called within a try block.

    B

     The exception thrown by method1 in class a is not required to be caught.

    C

     The method declared on line 31 must be declared to throw a RuntimeException.

    D

     On line 5 of class a, the call to method2 of class b does not need to be placed in a try/catch block.


    正确答案: B
    解析: 暂无解析

  • 第21题:

    多选题
    1. public class A {  2. public void method1() {  3. B b=new B();  4. b.method2();  5. // more code here  6. }  7. }  1. public class B {  2. public void method2() {  3.C c=new C();  4. c.method3();  5. // more code here  6. }  7. }  1. public class C {  2. public void method3() {  3. // more code here  4. }  5. }  Given:  25. try {  26. A a=new A();  27. a.method1();  28. } catch (Exception e) {  29. System.out.print(”an error occurred”);  30. }  Which two are true if a NullPointerException is thrown on line 3 of class C?()
    A

    The application will crash.

    B

    The code on line 29 will be executed.

    C

    The code on line 5 of class A will execute.

    D

    The code on line 5 of class B will execute.

    E

    The exception will be propagated back to line 27.


    正确答案: D,C
    解析: 暂无解析

  • 第22题:

    单选题
    Given a class Repetition: 1.package utils; 2. 3.public class Repetition{ 4.public static String twice(Strings){returns+s;} 5.} and given another class Demo: 1.//insert code here2. 3.public class Demo{ 4.public static void main(String[]args){ 5.System.out.println(twice("pizza")); 6.} 7.} Which code should be inserted at line 1 of Demo.java to compile and run Demo to print“pizzapizza”?()
    A

    import utils.*;

    B

    static import utils.*;

    C

    importutils.Repetition.*;

    D

    static importutils.Repetition.*;

    E

    import utils.Repetition.twice();

    F

    import static utils.Repetition.twice;

    G

    static import utils.Repetition.twice;


    正确答案: A
    解析: 暂无解析

  • 第23题:

    单选题
    In a class of 160 seniors, the ratio of boys to girls is 3 to 5. In the junior class, the ratio of boys to girls is 3 to 2. When the two classes are combined, the ratio of boys to girls is 1 to 1. How many students are in the junior class?
    A

    400

    B

    360

    C

    200

    D

    180

    E

    160


    正确答案: C
    解析:
    因为这个班共有160人,男生和女生的比例为3:5,所以男生和女生的人数分别为(3/8) ×160 = 60人,(5/8) ×160 = 100人。假设另一班男生女生人数共有x人,那么男生女生的人数分别为(3/5)x,(2/5)x,又因为当两班的人数相加后,男生女生的比例相等,所以可得出60 + (3/5)x = 100 + (2/5)x,经计算,x = 200。

  • 第24题:

    单选题
    Given a class Repetition:  1. package utils;  2.  3. public class Repetition {  4. public static String twice(String s) { return s + s; }  5. }  and given another class Demo:  1. // insert code here 2.  3. public class Demo {  4. public static void main(String[] args) {  5. System.out.println(twice(”pizza”));  6. }  7. }  Which code should be inserted at line 1 of Demo.java to compile and run Demo to print“pizzapizza”?()
    A

     import utils.*;

    B

     static import utils.*;

    C

     import utils.Repetition.*;

    D

     static import utils.Repetition. *;

    E

     import utils.Repetition.twice();

    F

     import static utils.Repetition.twice;

    G

     static import utils.Repetition.twice;


    正确答案: B
    解析: 暂无解析