Question 1

What will be returned from the method, if the following is the method header?
Public Rectangle getRectangle()

Accepted Answer

A)   the address of an object of the Rectangle class
B)   the values stored in the data members of the Rectangle object
C)   a null value
D)   an object that is contained in the class RectangleE) C) and D)
F) B) and C)

Question 2

Enumerated types have this method, which returns the position of an enum constant in the declaration list.

Accepted Answer

A)   position
B)   location
C)   ordinal
D)   indexE) None of the above
F) All of the above

Question 3

An instance of a class does not have to exist in order for values to be stored in a class's static fields.

Accepted Answer

A) True 
 B)False

Question 4

If object1 and object2 are objects of the same class, to make object2 a copy of object1

Accepted Answer

A)   write a method for the class that will make a field by field copy of object1 data members into object2 data members.
B)   use the copy method that is a part of the Java API.
C)   use the default constructor to create object2 with object1 data members.
D)   use an assignment statement to make object2 a copy of object1.E) B) and C)
F) A) and D)

Question 5

When you make a copy of the aggregate object and of the objects it references,

Accepted Answer

A)   you are performing a shallow copy.
B)   you are performing a nested copy.
C)   you are performing a deep copy.
D)   a compiler error will occur.E) B) and C)
F) All of the above C

Question 6

The only limitation that static methods have is

Accepted Answer

A)   they must be declared outside of the class.
B)   they cannot refer to nonstatic members of the class.
C)   they can only be called from static members of the class.
D)   they can refer to only nonstatic members of the class.E) A) and B)
F) C) and D)

Question 7

Of the following, which would be considered the no-arg constructor for the Rectangle class?

Accepted Answer

A)   public Rectangle(int len, int width) 
B)   public Rectangle(double len, double width) 
C)   public Rectangle() 
D)   All of the aboveE) All of the above
F) None of the above C

Question 8

When a method's return type is an object, what is actually returned to the calling program?

Accepted Answer

A)   a reference to an object of that class
B)   only the values in the object that the method accessed
C)   an object of that class
D)   a null referenceE) B) and D)
F) A) and D)

Question 9

When an object is passed as an argument, it is actually a reference to the object that is passed.

Accepted Answer

A) True 
 B)False

Question 10

When a method in the ________ class returns a reference to a field object, it should return a reference to a copy of the field object to prevent "security holes."

Accepted Answer

A)   aggregate
B)   inner
C)   String
D)   nestedE) B) and C)
F) All of the above

Question 11

A method's signature consists of

Accepted Answer

A)   the method name and the parameter list.
B)   the return type, the method name, and the parameter list.
C)   the size of the method in memory.
D)   the return type and the method name.E) A) and D)
F) All of the above A

Question 12

________ is the term for the relationship created by object aggregation.

Accepted Answer

A)   "Has a"
B)   Inner class
C)   "Is a"
D)   One-to-manyE) A) and D)
F) All of the above

Question 13

Assume the class BankAccount has been created, and the following statement correctly creates an instance of the class: BankAccount account = new BankAccount(5000.0) ;
What is true about the following statement?
System.out.println(account) ;

Accepted Answer

A)   A runtime error will occur.
B)   The method will display unreadable binary data on the screen.
C)   The account object's toString method will be implicitly called.
D)   A compiler error will occur.E) None of the above
F) All of the above

Question 14

The "has a" relationship is sometimes called a(n)  ________ because one object is part of a greater whole.

Accepted Answer

A)   enterprise
B)   possession
C)   mutual relationship
D)   whole-part relationshipE) All of the above
F) A) and B)

Question 15

If you have defined a class SavingsAccount with a public static method getNumberOfAccounts, and created a SavingsAccount object referenced by the variable account20, which of the following will call the getNumberOfAccounts method?

Accepted Answer

A)   account20.getNumberOfAccounts() ;
B)   SavingsAccount.getNumberOfAccounts() ;
C)   getNumberOfAccounts() ;
D)   None of the aboveE) C) and D)
F) A) and B)

Question 16

Look at the following declaration:
Enum Tree { OAK, MAPLE, PINE }
What is the fully-qualified name of the PINE enum constant?

Accepted Answer

A)   enum.PINE
B)   PINE
C)   Tree.PINE
D)   enum.Tree.PINEE) A) and C)
F) A) and B)

Question 17

A class that is defined inside of another class is called a(n)

Accepted Answer

A)   nested class.
B)   enumerated class.
C)   inner class.
D)   helper class.E) A) and B)
F) B) and C)

Question 18

enum constants have a toString method.

Accepted Answer

A) True 
 B)False

Question 19

You can declare an enumerated data type inside of a method.

Accepted Answer

A) True 
 B)False

Question 20

You can use the enum key word to

Accepted Answer

A)   create your own data type.
B)   specify the values that belong to that type.
C)   Both A and B
D)   Neither A nor BE) B) and D)
F) B) and C)

Exam 6: A Second Look at Classes and Objects

What will be returned from the method, if the following is the method header? Public Rectangle getRectangle()

Correct AnswerverifiedShow Answer

Enumerated types have this method, which returns the position of an enum constant in the declaration list.

Correct AnswerverifiedShow Answer

An instance of a class does not have to exist in order for values to be stored in a class's static fields.

Correct AnswerverifiedShow Answer

If object1 and object2 are objects of the same class, to make object2 a copy of object1

Correct AnswerverifiedShow Answer

When you make a copy of the aggregate object and of the objects it references,

Correct AnswerverifiedC

The only limitation that static methods have is

Correct AnswerverifiedShow Answer

Of the following, which would be considered the no-arg constructor for the Rectangle class?

Correct AnswerverifiedC

When a method's return type is an object, what is actually returned to the calling program?

Correct AnswerverifiedShow Answer

When an object is passed as an argument, it is actually a reference to the object that is passed.

Correct AnswerverifiedShow Answer

When a method in the ________ class returns a reference to a field object, it should return a reference to a copy of the field object to prevent "security holes."

Correct AnswerverifiedShow Answer

A method's signature consists of

Correct AnswerverifiedA

________ is the term for the relationship created by object aggregation.

Correct AnswerverifiedShow Answer

Assume the class BankAccount has been created, and the following statement correctly creates an instance of the class: BankAccount account = new BankAccount(5000.0) ; What is true about the following statement? System.out.println(account) ;

Correct AnswerverifiedShow Answer

The "has a" relationship is sometimes called a(n) ________ because one object is part of a greater whole.

Correct AnswerverifiedShow Answer

If you have defined a class SavingsAccount with a public static method getNumberOfAccounts, and created a SavingsAccount object referenced by the variable account20, which of the following will call the getNumberOfAccounts method?

Correct AnswerverifiedShow Answer

Look at the following declaration: Enum Tree { OAK, MAPLE, PINE } What is the fully-qualified name of the PINE enum constant?

Correct AnswerverifiedShow Answer

A class that is defined inside of another class is called a(n)

Correct AnswerverifiedShow Answer

enum constants have a toString method.

Correct AnswerverifiedShow Answer

You can declare an enumerated data type inside of a method.

Correct AnswerverifiedShow Answer

You can use the enum key word to

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
C

Correct Answer
verified

Correct Answer
verified
C

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
A

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified