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单选题
class Beverage { Beverage() { System.out.print("beverage "); } } class Beer extends Beverage { public static void main(String [] args) { Beer b = new Beer(14); } public int Beer(int x) { this(); System.out.print("beer1 "); } public Beer() { System.out.print("beer2 "); } } 结果是什么?()
A
beer1 beverage
B
beer2 beverage
C
beverage beer1
D
编译失败
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更多 “单选题class Beverage { Beverage() { System.out.print("beverage "); } } class Beer extends Beverage { public static void main(String [] args) { Beer b = new Beer(14); } public int Beer(int x) { this(); System.out.print("beer1 "); } public Beer() { System.out.print("beer2 "); } } 结果是什么?()A beer1 beverageB beer2 beverageC beverage beer1D 编译失败” 相关考题
考题
若有如下程序:public class Test {public static void main (String[] args) {int x=20;if (x>10) System.out.print(x-=5);if (x>5) System.out.print(x--);}}则程序运行后的输出结果是【 】。
考题
阅读下列说明与相关类图,填空并回答问题。【说明】装饰者模式动态地给一个对象添加一些额外的职责,就扩展功能而言,该模式比生成子类方式更加灵活。装饰模式的提出有助于解决滥用继承的问题。例如,一个名叫星巴兹(Starbuzz)的咖啡连锁店提供多种多样的咖啡,最朴素的设计就是采用继承,即设计一个饮料抽象基类Beverage,让不同种类的咖啡HouseBlend、 Decaf、Espresso、DarkRoast继承Beverage类,如图13-23所示。Beverage类的cost()方法是抽象方法,每个子类的cost()方法实现即返回具体咖啡种类的价钱,Beverage类的 description实例变量由每个子类设置,用来描述该类饮料,Beverage类的getDescription()方法用来返回此描述。客户在点咖啡时还可以要求添加各种各样的调料(Condiment),加入的调料不同所收取的费用也是不同的,让各种加了调料的不同咖啡都继承基类Beverage,当咖啡种类和调料种类很多时,组合种类的数量就会急剧增长,就会发生“类数量爆炸”现象,如图13-24所示。显然,采用这种设计方式会使得代码的维护变得十分困难,可以采用装饰者模式来解决这个问题。软件设计师蝴蝶飞根据装饰者模式的思想设计了如图13-25所示的类图。在图13-25中,将各种调料Milk、Mocha、Soy、Whip作为装饰者来装饰House- Blend、Decal、Espresso、DarkRoast等各种咖啡。下面的Java程序(代码13-6)对应其具体实现。【代码13-6】import java.io.* ;abstract class Beverage{String description="Unknown Beverage";public String getDescription(){return description;}public (1) double cost();}abstract class CondimentDecorator (2) Beverage {public abstract Strmg getDescription();}class Decafextends Beverage {public Decaf(){description="Decaf Coffee";}public double cost(){return 1.05;}}class Espresso extends Beverage {public Espresso() {description="Espresso";}public double cost(){return 1.99;}}class HouseBlend extends Beverage{public HouseBlend(){description="House Blend Coffee";}public double cost(){return.89;}}class DarkRoast extends Beverage{public DarkRoast(){description="Dark Roast Coffee";}public double cost(){return.99;}}class Mocha extends CondtmentDecorator{Beverage (3);public Mocha(Beverage beverage){this.beverage=beverage;}public String getDescription(){return beverage.getDescription()+", Mocha";}public double cost(){return.20+beverage.cost();}}Class Soy extends CondimentDecorator{Beverage beverage;public Soy(Beverage beverage) {this.beverage=beverage;}public Strillg getDescription(){
考题
classBeverage{Beverage(){System.out.print(beverage);}}classBeerextendsBeverage{publicstaticvoidmain(String[]args){Beerb=newBeer(14);}publicintBeer(intx){this();System.out.print(beer1);}publicBeer(){System.out.print(beer2);}}结果是什么?()A.beer1beverageB.beer2beverageC.beveragebeer1D.编译失败
考题
现有classBeverage{Beverage(){System.out.print(beverage);}}classBeerextendsBeverage{publicstaticvoidmain{string[]args){Beerb=newBeer(14);}publicintBeer(intx){this();System.out.print(beerl);}publicBeer(){System.out.print(beer2);}}结果是什么?()A.beerlbeverageB.beer2beverageC.beveragebeer2beerlD.编译失败
考题
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();}}
考题
试题五(共15分)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】某咖啡店当卖咖啡时,可以根据顾客的要求在其中加入各种配料,咖啡店会根据所加入的配料来计算费用。咖啡店所供应的咖啡及配料的种类和价格如下表所示。【C++代码】include iostreaminclude stringusing namespace std;const int ESPRESSO_PRICE = 25;const int DRAKROAST_PRICE = 20;const int MOCHA_PRICE = 10;const int WHIP_PRICE = 8;class Beverage { //饮料(1) :string description;public:(2) (){ return description; }(3) ;};class CondimentDecorator : public Beverage { //配料protected:(4) ;};class Espresso : public Beverage { //蒸馏咖啡public:Espresso () {description="Espresso"; }int cost(){return ESPRESSO_PRICE; }};class DarkRoast : public Beverage { //深度烘焙咖啡public:DarkRoast(){ description = "DardRoast"; }int cost(){ return DRAKROAST_PRICE; }};class Mocha : public CondimentDecorator { //摩卡public:Mocha(Beverage*beverage){ this-beverage=beverage; }string getDescription(){ return beverage-getDescription()+",Mocha"; }int cost(){ return MOCHA_PRICE+beverage-cost(); }};class Whip :public CondimentDecorator { //奶泡public:Whip(Beverage*beverage) { this-beverage=beverage; }string getDescription() {return beverage-getDescription()+",Whip"; }int cost() { return WHIP_PRICE+beverage-cost(); }};int main() {Beverage* beverage = new DarkRoast();beverage=new Mocha( (5) );beverage=new Whip( (6) );coutbeverage-getDescription()"¥"beverage-cost() endl;return 0;}编译运行上述程序,其输出结果为:DarkRoast, Mocha, Whip ¥38
考题
试题六(共15分)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】某咖啡店当卖咖啡时,可以根据顾客的要求在其中加入各种配料,咖啡店会根据所加入的配料来计算费用。咖啡店所供应的咖啡及配料的种类和价格如下表所示。【Java代码】import java.util.*;(1) class Beverage { //饮料String description = "Unknown Beverage";public (2) (){return description;}public (3) ;}abstract class CondimentDecorator extends Beverage { //配料(4) ;}class Espresso extends Beverage { //蒸馏咖啡private final int ESPRESSO_PRICE = 25;public Espresso() { description="Espresso"; }public int cost() { return ESPRESSO_PRICE; }}class DarkRoast extends Beverage { //深度烘焙咖啡private finalint DARKROAST_PRICE = 20;public DarkRoast() { description = "DarkRoast"; }public int cost(){ rcturn DARKROAST PRICE; }}class Mocha extends CondimentDecorator { //摩卡private final int MOCHA_PRICE = 10;public Mocha(Beverage beverage) {this.beverage = beverage;}public String getDescription() {return beverage.getDescription0 + ", Mocha";}public int cost() {return MOCHA_PRICE + beverage.cost();}}class Whip extends CondimentDecorator { //奶泡private finalint WHIP_PRICE = 8;public Whip(Beverage beverage) { this.beverage = beverage; }public String getDescription() {return beverage.getDescription()+", Whip";}public int cost() { return WHIP_PRICE + beverage.cost(); }}public class Coffee {public static void main(String args[]) {Beverage beverage = new DarkRoast();beverage=new Mocha( 5 );beverage=new Whip ( 6 );System.out.println(beverage.getDescription() +"¥" +beverage.cost());}}编译运行上述程序,其输出结果为:DarkRoast, Mocha, Whip ¥38
考题
以下程序调试结果为:class Base{Base(){int i = 100;System.out.print (i);}}public class Pri extends Base{static int i = 200;public static void main(String argv[]){Pri p = new Pri();System.out.print(i);}}
A.编译错误B.200C.100200D.100
考题
public class Base { public static final String FOO = “foo”; public static void main(String[] args) { Base b = new Base(); Sub s = new Sub(); System.out.print(Base.FOO); System.out.print(Sub.FOO); System.out.print(b.FOO); System.out.print(s.FOO); System.out.print(((Base)s).FOO); } } class Sub extends Base {public static final String FOO=bar;} What is the result?() A、 foofoofoofoofooB、 foobarfoobarbarC、 foobarfoofoofooD、 foobarfoobarfooE、 barbarbarbarbarF、 foofoofoobarbarG、 foofoofoobarfoo
考题
程序: class TestReference{ public static void main(String[] args){ int x=2; TestReference tr = new TestReference(); System.out.print(x); tr.change(x); System.out.print(x); } public void change(int num){ num = num + 1; } } 程序运行后的输出是哪项?() A、 23B、 21C、 22D、 编译错误
考题
class Flibitz { public static void main(String [] args) { int grop = 7; new Flibitz().go(grop); System.out.print(grop); } void go(int grop) { if(++grop 〉 7) grop++; System.out.print(grop); } } 结果为:() A、77B、79C、97D、99
考题
现有: class Cat { Cat(int c) { System.out.print("cat" + c + " "); } } class SubCat extends Cat { SubCat(int c) { super(5); System.out.print("cable "); } SubCat() { this(4); } public static void main(String [] args) { SubCat s = new SubCat(); } } 结果为:() A、cat5B、cableC、cable cat5D、cat5 cable
考题
class Top { static int x = 1; public Top(int y) { x *= 3; } } class Middle extends Top { public Middle() { x += 1; } public static void main(String [] args) { Middle m = new Middle(); System.out.println(x); } } 结果为:() A、1B、2C、3D、编译失败
考题
class Passer { static final int x = 5; public static void main(String [] args) { new Passer().go(x); System.out.print(x); } void go(int x) { System.out.print(++x); } } 结果是什么?() A、55B、56C、65D、66
考题
class Beverage { Beverage() { System.out.print("beverage "); } } class Beer extends Beverage { public static void main(String [] args) { Beer b = new Beer(14); } public int Beer(int x) { this(); System.out.print("beer1 "); } public Beer() { System.out.print("beer2 "); } } 结果是什么?() A、beer1 beverageB、beer2 beverageC、beverage beer1D、编译失败
考题
现有 class Beverage { Beverage () { System.out.print ("beverage "); } } class Beer extends Beverage { public static void main{string [] args) { Beer b = new Beer (14) ; } public int Beer(int x) { this () ; System.out.print ("beerl") ; } public Beer() { System.out.print("beer2 "); } } 结果是什么?() A、beerl beverageB、beer2 beverageC、beverage beer2 beerlD、编译失败
考题
class Parser extends Utils { public static void main(String [] args) { System.out.print(new Parser().getInt("42")); } int getInt(String arg) { return Integer.parseInt(arg); } } class Utils { int getInt(String arg) throws Exception { return 42; } } 结果为:() A、42B、编译失败C、无输出结果D、运行时异常被抛出
考题
单选题现有 class Beverage { Beverage () { System.out.print ("beverage "); } } class Beer extends Beverage { public static void main{string [] args) { Beer b = new Beer (14) ; } public int Beer(int x) { this () ; System.out.print ("beerl") ; } public Beer() { System.out.print("beer2 "); } } 结果是什么?()A
beerl beverageB
beer2 beverageC
beverage beer2 beerlD
编译失败
考题
单选题现有: class Cat { Cat (int c) {System.out.print {"cat"+c+" "); } } class SubCat extends Cat { SubCat (int c){super (5); System.out.print ("cable");} SubCat() { this (4); } public static void main (String [] args) { SubCat s= new SubCat(); } } 结果为:()A
cat5B
cableC
cat5 cableD
cable cat5
考题
单选题现有: class Cat { Cat(int c) { System.out.print("cat" + c + " "); } } class SubCat extends Cat { SubCat(int c) { super(5); System.out.print("cable "); } SubCat() { this(4); } public static void main(String [] args) { SubCat s = new SubCat(); } } 结果为:()A
cat5B
cableC
cable cat5D
cat5 cable
考题
单选题class Bird { static void talk() { System.out.print("chirp "); } } class Parrot extends Bird { static void talk() { System.out.print("hello "); } public static void main(String [] args) { Bird [] birds = {new Bird(), new Parrot()}; for( Bird b : birds) b.talk(); } } 结果为:()A
chirp chirpB
chirp helloC
hello helloD
编译失败
考题
单选题class Flibitz { public static void main(String [] args) { int grop = 7; new Flibitz().go(grop); System.out.print(grop); } void go(int grop) { if(++grop 〉 7) grop++; System.out.print(grop); } } 结果为:()A
77B
79C
97D
99
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
考题
单选题class TestReference{ public static void main(String[] args){ int x=2; TestReference tr = new TestReference(); System.out.print(x); tr.change(x); System.out.print(x); } public void change(int num){ num = num + 1; } } 程序运行后的输出是哪项()?A
23B
21C
22D
编译错误
考题
单选题class Passer { static final int x = 5; public static void main(String [] args) { new Passer().go(x); System.out.print(x); } void go(int x) { System.out.print(++x); } } 结果是什么?()A
55B
56C
65D
66
考题
单选题class Beverage { Beverage() { System.out.print("beverage "); } } class Beer extends Beverage { public static void main(String [] args) { Beer b = new Beer(14); } public int Beer(int x) { this(); System.out.print("beer1 "); } public Beer() { System.out.print("beer2 "); } } 结果是什么?()A
beer1 beverageB
beer2 beverageC
beverage beer1D
编译失败
考题
单选题class Top { static int x = 1; public Top(int y) { x *= 3; } } class Middle extends Top { public Middle() { x += 1; } public static void main(String [] args) { Middle m = new Middle(); System.out.println(x); } } 结果为:()A
1B
2C
3D
编译失败
考题
单选题public class Base { public static final String FOO = “foo”; public static void main(String[] args) { Base b = new Base(); Sub s = new Sub(); System.out.print(Base.FOO); System.out.print(Sub.FOO); System.out.print(b.FOO); System.out.print(s.FOO); System.out.print(((Base)s).FOO); } } class Sub extends Base {public static final String FOO=bar;} What is the result?()A
foofoofoofoofooB
foobarfoobarbarC
foobarfoofoofooD
foobarfoobarfooE
barbarbarbarbarF
foofoofoobarbarG
foofoofoobarfoo
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