Given: interface Hungry { void munch(E x); } interface Carnivore extends Hungry {} interface Herbivore extends Hungry {} abstract class Plant {} class Grass extends Plant {} abstract class Animal {} class Sheep extends Animal implements Herbivore { public void munch(Sheep x) {} } class Wolf extends Animal implements Carnivore { public void munch(Sheep x) {} } Which of the following changes (taken separately) would allow this code to compile?(Choose all that apply.)

Correct Answer is : Change the Herbivore interface tointerface Herbivore < E extends Animal > extends Hungry < E > {}

Change the Carnivore interface to interface Carnivore extends Hungry {}

Change the Herbivore interface to interface Herbivore extends Hungry {}

Change the Sheep class to class Sheep extends Plant implements Carnivore { public void munch(Wolf x) {} }

Change the Wolf class to class Wolf extends Animal implements Herbivore { public void munch(Grass x) {} }

Collections and Generics

Question : 47 of 53

Marks: +1, -0

Given:

interface Hungry < E > { void munch(E x); }
interface Carnivore < E extends Animal > extends Hungry < E > {}
interface Herbivore extends Hungry < E > {}
abstract class Plant {}
class Grass extends Plant {}
abstract class Animal {}
class Sheep extends Animal implements Herbivore < Sheep > {
  public void munch(Sheep x) {}
}
class Wolf extends Animal implements Carnivore < Sheep > {
  public void munch(Sheep x) {}
}

Which of the following changes (taken separately) would allow this code to compile?(Choose all that apply.)

Change the Carnivore interface to
interface Carnivore < E extends Plant > extends Hungry < E > {}
Change the Herbivore interface to
interface Herbivore < E extends Animal > extends Hungry < E > {}
Change the Sheep class to
class Sheep extends Animal implements Herbivore < Plant > { public void munch(Grass x) {} }
Change the Sheep class to
class Sheep extends Plant implements Carnivore < Wolf > { public void munch(Wolf x) {} }
Change the Wolf class to
class Wolf extends Animal implements Herbivore < Grass > { public void munch(Grass x) {} }
No changes are necessary.

Validate

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