Question 1

The hasNext()method of the Iterator interface has a return value of:

Accepted Answer

A) byte 
B) int 
C) boolean 
D) none of the above

Question 2

When an interface lists a method as "optional," you do not need to implement it when defining a class that implements the interface.

Accepted Answer

A) True 
 B)False

Question 3

A vector can potentially encounter an ArrayIndexOutOfBoundsException.

Accepted Answer

A) True 
 B)False

Question 4

How can one retrieve all the values of a HashMap object?

Accepted Answer

The answer of How can one retrieve all the values...

Question 5

A ____________ is a data structure for holding elements.

Accepted Answer

A) Collection 
B) Iterator 
C) Vector 
D) Wildcard

Question 6

Memory management methods of the vector class include all of the following except:

Accepted Answer

A) remove() 
B) trimToSize() 
C) capacity() 
D) size()

Question 7

All Collection classes are part of the java.util package.

Accepted Answer

A) True 
 B)False

Question 8

The V parameter in a HashMap<K,V> may be any object,but the K parameter must be a String.

Accepted Answer

A) True 
 B)False

Question 9

The number of entries that may be added to a HashMap object is limited to what is specified as the initial capacity in the constructor for the HashMap object.

Accepted Answer

A) True 
 B)False

Question 10

Write a Java statement to resize the resulting vector in number 2 above to 100.

Accepted Answer

The answer of Write a Java statement to resize the...

Question 11

A ___________ is used to specify a wide range of parameters.

Accepted Answer

A) Collection 
B) Iterator 
C) Vector 
D) Wildcard

Question 12

To change an existing element of a vector you must use the __________ method.

Accepted Answer

A) add() 
B) set() 
C) change() 
D) mutate()

Question 13

An Iterator is an object that allows your code to produce the elements in a vector or other container one after the other,exactly once.

Accepted Answer

A) True 
 B)False

Question 14

The method contains(Object o)of the ArrayList class returns a value of type:

Accepted Answer

A) int 
B) char 
C) byte 
D) boolean

Question 15

What is the difference between a vector's size and a vector's capacity?

Accepted Answer

The answer of What is the difference between a vector's...

Question 16

Elements of a vector must be of a primitive type,such as int,double,or char.

Accepted Answer

A) True 
 B)False

Question 17

<T> is a wildcard used to specify a wide range of parameters.

Accepted Answer

A) True 
 B)False

Question 18

The method ___________ can be used to determine the number of elements in an ArrayList.

Accepted Answer

A) length() 
B) vectorLength() 
C) size() 
D) vectorSize()

Question 19

If you do not need efficient random access but need to efficiently move sequentially through the list,then use the _____________ class.

Accepted Answer

A) Vector 
B) LinkedList 
C) HashSet 
D) TreeSet

Question 20

The Collection class or interface that allows only unique elements is the ___________ class or interface.

Accepted Answer

A) List 
B) Set 
C) Vector 
D) all of the above

Exam 16: Collections and Iterators

The hasNext() method of the Iterator interface has a return value of:

When an interface lists a method as "optional," you do not need to implement it when defining a class that implements the interface.

A vector can potentially encounter an ArrayIndexOutOfBoundsException.

How can one retrieve all the values of a HashMap object?

A ____________ is a data structure for holding elements.

Memory management methods of the vector class include all of the following except:

All Collection classes are part of the java.util package.

The V parameter in a HashMap<K,V> may be any object,but the K parameter must be a String.

The number of entries that may be added to a HashMap<K,V> object is limited to what is specified as the initial capacity in the constructor for the HashMap<K,V> object.

Write a Java statement to resize the resulting vector in number 2 above to 100.

A ___________ is used to specify a wide range of parameters.

To change an existing element of a vector you must use the __________ method.

An Iterator is an object that allows your code to produce the elements in a vector or other container one after the other,exactly once.

The method contains(Object o) of the ArrayList class returns a value of type:

What is the difference between a vector's size and a vector's capacity?

Elements of a vector must be of a primitive type,such as int,double,or char.

<T> is a wildcard used to specify a wide range of parameters.

The method ___________ can be used to determine the number of elements in an ArrayList.

If you do not need efficient random access but need to efficiently move sequentially through the list,then use the _____________ class.

The Collection class or interface that allows only unique elements is the ___________ class or interface.