Question 1

Which statement is false?

Accepted Answer

A)  Java does not guarantee which item will be found first when a binarySearch is performed on a List containing multiple elements equivalent to the search key. 
B)  If the search key is found, method binarySearch returns the List index (position relative to 1) of the element containing the search key. 
C)  The binary search algorithm is fast. 
D)  Method binarySearch takes a List as the first argument. 
A)  Java does not guarantee which item will be found first when a binarySearch is performed on a List containing multiple elements equivalent to the search key. 
B)  If the search key is found, method binarySearch returns the List index (position relative to 1) of the element containing the search key. 
C)  The binary search algorithm is fast. 
D)  Method binarySearch takes a List as the first argument. B

Question 2

The classes and interfaces which comprise the collections framework are members of package ________.

Accepted Answer

A)  java.util. 
B)  javax.swing. 
C)  java.collections. 
D)  java.collection. 
A)  java.util. 
B)  javax.swing. 
C)  java.collections. 
D)  java.collection. A

Question 3

Algorithm __________ randomly orders a List's elements.

Accepted Answer

A)  randomShuffle. 
B)  randomPlacement. 
C)  fiftyTwoCardPickup. 
D)  shuffle. 
A)  randomShuffle. 
B)  randomPlacement. 
C)  fiftyTwoCardPickup. 
D)  shuffle. D

Question 4

Which of the following is not an abstract implementation provided by the collections framework?

Accepted Answer

A)  AbstractCollection. 
B)  AbstractTree. 
C)  AbstractMap. 
D)  AbstractList. 
A)  AbstractCollection. 
B)  AbstractTree. 
C)  AbstractMap. 
D)  AbstractList.

Question 5

The collections framework algorithms are __________, i.e., each of these algorithms can operate on objects that implement specified interfaces without concern for the underlying implementations.

Accepted Answer

A)  stable. 
B)  lexicographical. 
C)  polymorphic. 
D)  implementation dependent. 
A)  stable. 
B)  lexicographical. 
C)  polymorphic. 
D)  implementation dependent.

Question 6

Which statement is false?

Accepted Answer

A)  When a List is backed by an array, any modifications made through the List view change the array. 
B)  When a List is backed by an array, any modifications made to the array change the List view. 
C)  The only operation permitted on the view returned by Arrays method asList is delete, which deletes the value from the view and the backing array. 
D)  Adding elements to the view returned by Arrays method asList results in an UnsupportedOperationException. 
A)  When a List is backed by an array, any modifications made through the List view change the array. 
B)  When a List is backed by an array, any modifications made to the array change the List view. 
C)  The only operation permitted on the view returned by Arrays method asList is delete, which deletes the value from the view and the backing array. 
D)  Adding elements to the view returned by Arrays method asList results in an UnsupportedOperationException.

Question 7

Interface Collection contains __________ operations (i.e., operations performed on the entire collection).

Accepted Answer

A)  aggregate. 
B)  composite. 
C)  integral. 
D)  bulk. 
A)  aggregate. 
B)  composite. 
C)  integral. 
D)  bulk.

Question 8

Which statement is false?

Accepted Answer

A)  A ListIterator accesses the elements of a List. 
B)  Class ArrayList is a fixed-size array. 
C)  A LinkedList is a linked list implementation of a List. 
D)  ArrayLists execute faster than Vectors because they are not thread safe. 
A)  A ListIterator accesses the elements of a List. 
B)  Class ArrayList is a fixed-size array. 
C)  A LinkedList is a linked list implementation of a List. 
D)  ArrayLists execute faster than Vectors because they are not thread safe.

Question 9

Which of the following performs an unboxing conversion? 
Assume x refers to an Integer object.

Accepted Answer

A)  int y = x; 
B)  Integer y = x; 
C)  Neither of the above. 
D)  Both of the above. 
A)  int y = x; 
B)  Integer y = x; 
C)  Neither of the above. 
D)  Both of the above.

Question 10

Collections method sort that accepts a List as an argument. It sorts the List elements, which must implement the __________ interface.

Accepted Answer

A)  Comparable. 
B)  Comparator. 
C)  Compare. 
D)  Ordering. 
A)  Comparable. 
B)  Comparator. 
C)  Compare. 
D)  Ordering.

Question 11

Which statement is false?

Accepted Answer

A)  SortedSet extends Set. 
B)  Class SortedSet implements TreeSet. 
C)  When a HashSet is constructed, it removes any duplicates in the Collection. 
D)  By definition, a Set object does not contain any duplicates. 
A)  SortedSet extends Set. 
B)  Class SortedSet implements TreeSet. 
C)  When a HashSet is constructed, it removes any duplicates in the Collection. 
D)  By definition, a Set object does not contain any duplicates.

Question 12

A(n)__________ allows a program to walk through the collection and remove elements from the collection.

Accepted Answer

A)  Set. 
B)  Queue. 
C)  Iterator. 
D)  List. 
A)  Set. 
B)  Queue. 
C)  Iterator. 
D)  List.

Question 13

LinkedList method listIterator returns a(n) __________.

Accepted Answer

A)  Iterator. 
B)  List. 
C)  sub list. 
D)  bidirectional iterator. 
A)  Iterator. 
B)  List. 
C)  sub list. 
D)  bidirectional iterator.

Question 14

Comparator method compare should return ________ if the first argument is greater than the second argument.

Accepted Answer

A)  a positive int value. 
B)  zero. 
C)  a negative int value. 
D)  a String. 
A)  a positive int value. 
B)  zero. 
C)  a negative int value. 
D)  a String.

Question 15

PriorityQueue method __________ inserts an element at the appropriate location in the queue.

Accepted Answer

A)  offer. 
B)  push. 
C)  poll. 
D)  peek. 
A)  offer. 
B)  push. 
C)  poll. 
D)  peek.

Question 16

Which of these is not an example of a "real-life" collection?

Accepted Answer

A)  The cards you hold in a card game. 
B)  Your favorite songs stored in your computer. 
C)  The players on a soccer team. 
D)  The number of pages in a book. 
A)  The cards you hold in a card game. 
B)  Your favorite songs stored in your computer. 
C)  The players on a soccer team. 
D)  The number of pages in a book.

Question 17

Method shuffle is a member of __________.

Accepted Answer

A)  class Arrays. 
B)  class Collections. 
C)  interface Collection. 
D)  Interface List. 
A)  class Arrays. 
B)  class Collections. 
C)  interface Collection. 
D)  Interface List.

Question 18

__________ methods enable a program to view a portion of a collection.

Accepted Answer

A)  Focus-view. 
B)  Range-view. 
C)  Delimiter-view. 
D)  Subset-view. 
A)  Focus-view. 
B)  Range-view. 
C)  Delimiter-view. 
D)  Subset-view.

Question 19

Which statement is false?

Accepted Answer

A)  Queue is a new collection interface introduced in J2SE 5.0. 
B)  Queue and PriorityQueue are included in the java.util package. 
C)  PriorityQueue orders elements in increasing order, so that smallest value will be the first element removed from PriorityQueue. 
D)  Queue extends interface Collection. 
A)  Queue is a new collection interface introduced in J2SE 5.0. 
B)  Queue and PriorityQueue are included in the java.util package. 
C)  PriorityQueue orders elements in increasing order, so that smallest value will be the first element removed from PriorityQueue. 
D)  Queue extends interface Collection.

Question 20

Which statement is false?

Accepted Answer

A)  A List is a Collection. 
B)  A List cannot contain duplicate elements. 
C)  A List is sometimes called a sequence. 
D)  Lists use zero-based indices. 
A)  A List is a Collection. 
B)  A List cannot contain duplicate elements. 
C)  A List is sometimes called a sequence. 
D)  Lists use zero-based indices.

Exam 16: Generic Collections

Which statement is false?

The classes and interfaces which comprise the collections framework are members of package ________.

Algorithm __________ randomly orders a List's elements.

Which of the following is not an abstract implementation provided by the collections framework?

The collections framework algorithms are __________, i.e., each of these algorithms can operate on objects that implement specified interfaces without concern for the underlying implementations.

Which statement is false?

Interface Collection contains __________ operations (i.e., operations performed on the entire collection).

Which statement is false?

Which of the following performs an unboxing conversion? Assume x refers to an Integer object.

Collections method sort that accepts a List as an argument. It sorts the List elements, which must implement the __________ interface.

Which statement is false?

A(n)__________ allows a program to walk through the collection and remove elements from the collection.

LinkedList method listIterator returns a(n) __________.

Comparator method compare should return ________ if the first argument is greater than the second argument.

PriorityQueue method __________ inserts an element at the appropriate location in the queue.

Which of these is not an example of a "real-life" collection?

Method shuffle is a member of __________.

__________ methods enable a program to view a portion of a collection.

Which statement is false?

Which statement is false?

Introduction to Computers, the Internet and Java

Introduction to Java Applications; Inputoutput and Operators

Introduction to Classes, Objects, Methods and Strings

Control Statements: Assignment, and Operators

Control Statements: Logical Operators

Methods: a Deeper Look

Arrays and Arraylists

Classes and Objects: a Deeper Look

Object-Oriented Programming: Inheritance

Object-Oriented Programming: Polymorphism and Interfaces

Exception Handling: a Deeper Look

Javafx Graphical User Interfaces

Javafx Gui

Strings, Characters and Regular Expressions

Files, Inputoutput Streams, Nio and Xml Serialization

Lambdas and Streams

Recursion

Searching, Sorting and Big O

Generic Classes and Methods: a Deeper Look

Custom Generic Data Structures

Concurrency

Accessing Databases With Jdbc

Swing Gui Components

Graphics and Java 2d

Networking

Java Persistence Api Jpa

Javaserver Faces Web Apps

Javaserver Faces Web Apps

Swing Gui Components

Filters