多选题Given: 10. interface Jumper { public void jump(); } ...   20. class Animal {} ...   30. class Dog extends Animal {   31. Tail tail;   32. }   ...   40. class Beagle extends Dog implements Jumper{   41. public void jump() {}  42. }   ...   50. class Cat implements Jumper{   51. public void jump() {}   52. }. Which three are true?()ACat is-a JumperBCat is-a AnimalCDog is-a JumperDDog is-a AnimalEBeagle has-a JumperFCat has-a AnimalGBeagle has-a Tail

多选题
Given: 10. interface Jumper { public void jump(); } ...   20. class Animal {} ...   30. class Dog extends Animal {   31. Tail tail;   32. }   ...   40. class Beagle extends Dog implements Jumper{   41. public void jump() {}  42. }   ...   50. class Cat implements Jumper{   51. public void jump() {}   52. }. Which three are true?()
A

Cat is-a Jumper

B

Cat is-a Animal

C

Dog is-a Jumper

D

Dog is-a Animal

E

Beagle has-a Jumper

F

Cat has-a Animal

G

Beagle has-a Tail


参考解析

解析: 暂无解析

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单选题11. class Animal { public String noise() { return “peep”; } }  12. class Dog extends Animal {  13. public String noise() { return “bark”; }  14. }  15. class Cat extends Animal {  16. public String noise() { return “meow”; }  17. }  .....  30. Animal animal = new Dog();  31. Cat cat = (Cat)animal;  32. System.out.printIn(cat.noise());  What is the result?()A peepB barkC meowD Compilation fails.E An exception is thrown at runtime.

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多选题Which three demonstrate an “is a” relationship?()Apublic class X { }  public class Y extends X { }Bpublic interface Shape { }  public interface Rectangle extends Shape{ }Cpublic interface Color { }  public class Shape { private Color color; }Dpublic interface Species { }  public class Animal { private Species species; }Epublic class Person { } public class Employee {  public Employee(Person person) { }Finterface Component { }  class Container implements Component { private Component[] children; }

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多选题10. interface Jumper { public void jump(); }  ......  20. class Animal {}  ......  30. class Dog extends Animal { 31. Tail tail; 32. }  ......  40. class Beagle extends Dog implements Jumper {  41. public void jump() { }  42. }  .......  50. class Cat implements Jumper {  51. public void jump() { }  52. }  Which three are true?()ACat is-a AnimalBCat is-a JumperCDog is-a AnimalDDog is-a JumperECat has-a AnimalFBeagle has-a TailGBeagle has-a Jumper

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*/ } }

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*/}     }Bpublic class Employee extends Inf.implements Data{ public void load() {/*do something*/}     }Cpublic class Empl.yee implements Inf extends Data{ public void Data.1oad(){* do something*/}     public void load(){/*do something*/}     }Dpublic class Employee extends Inf implements Data  {  public void Data.1oad()  {/*do something*/)     public void info.1oad(){/*do something*/}    }

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?()APet Pet PetBCat Cat CatCCat Dog PetDCat Dog Dog