Question 1

A constructor cannot:

Accepted Answer

A)   be overloaded.
B)   initialize variables to their defaults.
C)   specify return types or return values.
D)   have the same name as the class.E) B) and D)
F) A) and D) C

Question 2

Which statement is false?

Accepted Answer

A)   An enum declaration is a comma-separated list of enum constants and may optionally include other components of traditional classes, such as constructors, fields and methods.
B)   Any attempt to create an object of an enum type with operator new results in a compilation error.
C)   An enum constructor cannot be overloaded.
D)   enum constants are implicitly final and static.E) B) and D)
F) B) and C) C

Question 3

When must a program explicitly use the this reference?

Accepted Answer

A)   Accessing a private variable.
B)   Accessing a public variable.
C)   Accessing a local variable.
D)   Accessing an instance variable that is shadowed by a local variable.E) A) and B)
F) A) and C)

Question 4

The static method ________ of class String returns a formatted String.

Accepted Answer

A)   printf.
B)   format.
C)   formatString.
D)   toFormatedString.E) All of the above
F) B) and D)

Question 5

Having a this reference allows:

Accepted Answer

A)   a method to refer explicitly to the instance variables and other methods of the object on which the method was called.
B)   a method to refer implicitly to the instance variables and other methods of the object on which the method was called.
C)   an object to reference itself.
D)   All of the above.E) C) and D)
F) All of the above D

Question 6

Which of the following statements is true?

Accepted Answer

A)   Methods and instance variables can both be either public or private.
B)   Information hiding is achieved by restricting access to class members via keyword public.
C)   The private members of a class are directly accessible to the clients of a class.
D)   None of the above is true.E) All of the above
F) A) and D)

Question 7

Instance variables declared final do not or cannot:

Accepted Answer

A)   Cause syntax errors if used as a left-hand value.
B)   Be initialized.
C)   Be modified after they are initialized.
D)   None of the above.E) None of the above
F) A) and B)

Question 8

The _________ of a class are also called the public services or the public interface that the class provides to its clients.

Accepted Answer

A)   public constructors.
B)   public instance variables.
C)   public methods.
D)   All of the above.E) A) and B)
F) B) and C)

Question 9

Which of the following is false?

Accepted Answer

A)   A static method must be used to access private static instance variables.
B)   A static method has no this reference.
C)   A static method can be accessed even when no objects of its class have been instantiated.
D)   A static method can call instance methods directly.E) A) and B)
F) None of the above

Question 10

Using public set methods helps provide data integrity if:

Accepted Answer

A)   The instance variables are public.
B)   The instance variables are private.
C)   The methods perform validity checking.
D)   Both b and c.E) B) and D)
F) All of the above

Question 11

Which statement is false?

Accepted Answer

A)   The actual data representation used within the class is of no concern to the class's clients.
B)   Clients generally care about what the class does but not how the class does it.
C)   Clients are usually involved in a class's implementation.
D)   Hiding the implementation reduces the possibility that clients will become dependent on class-implementation details.E) B) and C)
F) None of the above

Question 12

Which method returns an array of the enum's constants?

Accepted Answer

A)   values.
B)   getValues.
C)   constants.
D)   getConstants.E) A) and B)
F) B) and C)

Question 13

Constructors:

Accepted Answer

A)   Initialize instance variables.
B)   When overloaded, can have identical argument lists.
C)   When overloaded, are selected by number, types and order of types of parameters.
D)   Both (a)  and (c) .E) None of the above
F) All of the above

Question 14

Which of the following is false?

Accepted Answer

A)   Method finalize does not take parameters and has return type void.
B)   Memory leaks using Java are rare because of automatic garbage collection.
C)   Objects are marked for garbage collection by method finalize.
D)   The garbage collector reclaims unused memory.E) A) and B)
F) A) and C)

Question 15

When implementing a method, use the class's set and get methods to access the class's ________ data.

Accepted Answer

A)   public.
B)   private.
C)   protected.
D)   All of the above.E) A) and C)
F) A) and B)

Question 16

Set methods are also commonly called ________ methods and get methods are also commonly called ________ methods.

Accepted Answer

A)   query, mutator.
B)   accessor, mutator.
C)   mutator, accessor.
D)   query, accessor.E) A) and C)
F) B) and C)

Question 17

What happens when this is used in a constructor's body to call another constructor of the same class if that call is not the first statement in the constructor?

Accepted Answer

A)   A compilation error occurs.
B)   A runtime error occurs.
C)   A logic error occurs.
D)   Nothing happens. The program compiles and runs.E) A) and B)
F) A) and C)

Question 18

When no access modifier is specified for a method or variable, the method or variable:

Accepted Answer

A)   Is public.
B)   Is private.
C)   Has package access.
D)   Is static.E) B) and C)
F) A) and C)

Question 19

A final field should also be declared ________ if it is initialized in its declaration.

Accepted Answer

A)   private.
B)   public.
C)   protected.
D)   static.E) All of the above
F) B) and C)

Question 20

A programmer-defined constructor that has no arguments is called a(n)  ________.

Accepted Answer

A)   empty constructor.
B)   no-argument constructor.
C)   default constructor.
D)   null constructor.E) A) and D)
F) A) and C)

Exam 8: Classes and Objects: a Deeper Look

A constructor cannot:

Correct AnswerverifiedC

Which statement is false?

Correct AnswerverifiedC

When must a program explicitly use the this reference?

Correct AnswerverifiedShow Answer

The static method ________ of class String returns a formatted String.

Correct AnswerverifiedShow Answer

Having a this reference allows:

Correct AnswerverifiedD

Which of the following statements is true?

Correct AnswerverifiedShow Answer

Instance variables declared final do not or cannot:

Correct AnswerverifiedShow Answer

The _________ of a class are also called the public services or the public interface that the class provides to its clients.

Correct AnswerverifiedShow Answer

Which of the following is false?

Correct AnswerverifiedShow Answer

Using public set methods helps provide data integrity if:

Correct AnswerverifiedShow Answer

Which statement is false?

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Which method returns an array of the enum's constants?

Correct AnswerverifiedShow Answer

Constructors:

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Which of the following is false?

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When implementing a method, use the class's set and get methods to access the class's ________ data.

Correct AnswerverifiedShow Answer

Set methods are also commonly called ________ methods and get methods are also commonly called ________ methods.

Correct AnswerverifiedShow Answer

What happens when this is used in a constructor's body to call another constructor of the same class if that call is not the first statement in the constructor?

Correct AnswerverifiedShow Answer

When no access modifier is specified for a method or variable, the method or variable:

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A final field should also be declared ________ if it is initialized in its declaration.

Correct AnswerverifiedShow Answer

A programmer-defined constructor that has no arguments is called a(n) ________.

Correct AnswerverifiedShow Answer

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C

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D

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Set methods are also commonly called methods and get methods are also commonly called methods.

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