Question 1

Which of the following statements is false?

Accepted Answer

A)  An advantage of inheritance over interfaces is that only inheritance provides the is-a relationship.
B)  Objects of any subclass of a class that implements an interface can also be thought of as objects of that interface type.
C)  When a method parameter is declared with a subclass or interface type,the method processes the object passed as an argument polymorphically.
D)  All objects have the methods of class Object.E) None of the above
F) A) and B)

Question 2

Non-abstract classes are called ________.

Accepted Answer

A)  real classes.
B)  instance classes.
C)  implementable classes.
D)  concrete classes.E) A) and B)
F) B) and D)

Question 3

Polymorphism enables you to:

Accepted Answer

A)  program in the general.
B)  program in the specific.
C)  absorb attributes and behavior from previous classes.
D)  hide information from the user.E) All of the above
F) B) and D)

Question 4

Which keyword is used to specify that a class will define the methods of an interface?

Accepted Answer

A)  uses
B)  implements
C)  defines
D)  extendsE) B) and D)
F) B) and C)

Question 5

It is a UML convention to denote the name of an abstract class in ________.

Accepted Answer

A)  bold.
B)  italics.
C)  a diamond.
D)  there is no convention of the UML to denote abstract classes-they are listed just as any other class.E) C) and D)
F) A) and B)

Question 6

Declaring a method final means:

Accepted Answer

A)  it will prepare the object for garbage collection.
B)  it cannot be accessed from outside its class.
C)  it cannot be overloaded.
D)  it cannot be overridden.E) B) and C)
F) A) and D)

Question 7

Classes and methods are declared final for all but the following reasons:

Accepted Answer

A)  final methods allow inlining the code.
B)  final methods and classes prevent further inheritance.
C)  final methods are static.
D)  final methods can improve performance.E) C) and D)
F) A) and C)

Question 8

Which of the following could be used to declare abstract method method1 in abstract class Class1 (method1 returns an int and takes no arguments) ?

Accepted Answer

A)  public int method1() ;
B)  public int abstract method1() ;
C)  public abstract int method1() ;
D)  public int nonfinal method1() ;E) A) and C)
F) All of the above

Exam 10: Object-Oriented Programming: Polymorphism

Declaring a method final means:

Correct Answer
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Non-abstract classes are called ________.

Correct Answer
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Which of the following statements is false?

Correct Answer
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Classes and methods are declared final for all but the following reasons:

Correct Answer
verified

It is a UML convention to denote the name of an abstract class in ________.

Correct Answer
verified

Which of the following could be used to declare abstract method method1 in abstract class Class1 (method1 returns an int and takes no arguments) ?

Correct Answer
verified

Polymorphism enables you to:

Correct Answer
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Which keyword is used to specify that a class will define the methods of an interface?

Correct Answer
verified

Exam 10: Object-Oriented Programming: Polymorphism

Declaring a method final means:

Correct AnswerverifiedShow Answer

Non-abstract classes are called ________.

Correct AnswerverifiedShow Answer

Which of the following statements is false?

Correct AnswerverifiedShow Answer

Classes and methods are declared final for all but the following reasons:

Correct AnswerverifiedShow Answer

It is a UML convention to denote the name of an abstract class in ________.

Correct AnswerverifiedShow Answer

Which of the following could be used to declare abstract method method1 in abstract class Class1 (method1 returns an int and takes no arguments) ?

Correct AnswerverifiedShow Answer

Polymorphism enables you to:

Correct AnswerverifiedShow Answer

Which keyword is used to specify that a class will define the methods of an interface?

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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