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A. No errors would be produced. B. This code would result in compile errors.
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1. Which statement is true about the term polymorphism A. It is a Latin word that roughly means changeable. B. It is a Greek word that roughly means many forms. C. It is an Old English word that roughly means insectlike. D. It is a new technical term that means Java object. Answer:
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3 B. The word polymorphism comes from the Greeks and means many forms.
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A, C, nd D are incorrect. a 2. What type of object can polymorphically behave as another A. An object can act as any subclass of the class it was created from. B. An object can act as any superclass of the class it was created from. C. An object can act as any other abstract class. Answer:
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3 B . An object inherits all of the functionality of its superclasses, and therefore can polymorphically behave as they do.
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and C are incorrect. A is incorrect because an object cannot behave as its subclass since A this class is more specific and contains functionality that is not present in the superclass. C is incorrect because there needs to be an is-a relationship between the classes. This answer does not mention what the relationship is. 3. Polymorphism helps to facilitate which of the following (Choose all that apply.) A. Highly optimized code B. Code reuse C. Code obfuscation D. Code that is generic and flexible
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Answer:
3 B and D. Polymorphism aids in creating reusable code because it allows the code to be written more abstractly, thus B is correct. Similar to B, polymorphism allows the code to be generic by using generic data types that any more specific object can fulfill. Thus, D is also correct.
and C are incorrect. A is incorrect because polymorphism has no effect on the level of A optimization of the code. C is incorrect because obfuscated code (code that is intentionally hard to read) is not related to polymorphism. 4. What is a correct is-a relationship A. A specific object is-a more generic one. B. A generic object is-a more specific one. C. A null object is-an object. Answer:
3 A . A more specific object can be considered to be a more generic one. This is the fundamental principle of polymorphism.
and C are incorrect. B is incorrect because generic objects do not have all of the B functionality of more specific ones and therefore do not possess an is-a relationship with the specific objects. C is incorrect because a null object has no effect on its relationship with other objects. 5. Which of the following statements explain why an object can polymorphically behave as an interface A. y implementing the interface, the object is required to have all of the functionality that B the interface represents. B. By implementing the interface, the object inherits all the required methods it defines. C. An object can behave as an interface because interfaces do not have a strict expected behavior and therefore any object can act as an interface.
Answer:
3 A . When a class implements an interface it is then required to implement all the methods the interface contains. This gives the class the functionality defined in the interface and therefore allows this class to behave as the interface.
and C are incorrect. B is incorrect because nothing is inherited when an interface is B implemented. C is incorrect because each interface has a strict behavior expected of it. This is represented by the methods that must be implemented.
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6. What does it mean if a developer is programming to an interface A. They are implementing an interface for the class they are working on. B. They were given a set of interfaces they must implement. C. They are defining the functionality instead of strict object types as much as possible. Answer:
3 P C. rogramming to an interface means that a developer is defining functionality instead of object data types. This allows any objects to be used with this code as long as they implement the interface.
and B are incorrect. A is incorrect because programming to an interface is a larger A concept than just implementing one interface in one class. B is incorrect because, in this situation, the developer is just implementing a group of interfaces that have been predetermined.
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