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填空题
Animal is a super-ordinate term, while cow, horse, pig, dog, cat, etc. are（）.
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在Java中， 类Animal中的方法printA（）定义如下： publicvoidprintA（）{ inta=10； intresult=10%3； System.out.println（result）；} 在类Dog中方法printA（）定义如下： publicvoidprintA（）{ inta=10； System.out.println（a/3）；} Dog类的定义如下： classDogextendsAnimal{…}.Animalanimal=newDog（）；animal.printA（）； 以上语句输出为（）。A、0B、1C、2D、3E、3.3333
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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
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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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单选题在Java中，类Animal中的方法printA（）定义如下： public void printA（） { Int a=10； Int result =10%3； System.out.println（result）； } 在类Dog中方法printA（）定义如下： public void printA（） { Int a=10； System.out.println（a/3）； } Dog类的定义如下： Class Dog extends Animal{…}. Animal animal=new Dog（）； animal.printA（）； 以上语句输出结果为（）。A
0B
1C
2D
3E
3.3333
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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
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单选题1. class Animal ｛ Animal getOne（） ｛ return new Animal（）； ｝ ｝ 2. class Dog extends Animal ｛ 3. // insert code here 4. ｝ 5. 6. class AnimalTest ｛ 7. public static void main（String [] args） ｛ 8. Animal [] animal ＝ ｛ new Animal（）， new Dog（） ｝ ； 9. for（ Animal a ： animal） ｛ 10. Animal x ＝ a.getOne（）； 11. ｝ 12. ｝ 13. ｝ 和代码： 3a. Dog getOne（） ｛ return new Dog（）； ｝ 3b. Animal getOne（） ｛ return new Dog（）； ｝ 第 3 行中插入的哪项将编译且运行无异常？（）A
3a行B
3b行C
3a行或3b行D
既非3a，也非3b
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单选题class Animal{ Animal getOne（）{return new Animal（）；}} class Dog extends Animal{ //insert code here } class AnimalTest{ public static void main（String[] args）{ Animal[] animal={ new Animal（）， new Dog（）}； for（Animal a：animal）{ Animal x= a.getOne（）； } } } 和代码： 3a.Dog getOne（） { return new Dog（）；} 3b.Animal getOne（） { return new Dog（）；} 第3行中插入的哪项编译且运行无异常？A
3a行或3b行B
既非3a，也非3bC
3a行D
3b行
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