Question 1

A Properties object is a __________ Hashtable object.

Accepted Answer

A) transient. 
B) persistent. 
C) polymorphic. 
D) protected. 
A) transient. 
B) persistent. 
C) polymorphic. 
D) protected. 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

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. D

Question 4

__________ allows a program to walk through the collection and remove elements from the collection.

Accepted Answer

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

Question 5

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 6

To find the smallest and largest element of a Collection,use Collections methods _________ and __________.

Accepted Answer

A) least,greatest. 
B) small,large. 
C) first,last. 
D) min,max. 
A) least,greatest. 
B) small,large. 
C) first,last. 
D) min,max.

Question 7

Which statement is false?

Accepted Answer

A) The Collections API provides a set of public static methods for converting collections to unmodifiable versions. 
B) Unmodifable wrappers throw ModificationExceptions if attempts are made to modify the collection. 
C) You can use an unmodifiable wrapper to create a collection that offers read-only access to others while allowing read-write access to yourself. 
D) You can create the kind of collection mentioned in part (c)simply by giving others a reference to the unmodifiable wrapper while you also retain a reference to the wrapped collection itself. 
A) The Collections API provides a set of public static methods for converting collections to unmodifiable versions. 
B) Unmodifable wrappers throw ModificationExceptions if attempts are made to modify the collection. 
C) You can use an unmodifiable wrapper to create a collection that offers read-only access to others while allowing read-write access to yourself. 
D) You can create the kind of collection mentioned in part (c)simply by giving others a reference to the unmodifiable wrapper while you also retain a reference to the wrapped collection itself.

Question 8

Collections method __________ returns true if two Collections have no elements in common.

Accepted Answer

A) shuffle. 
B) contains. 
C) hasCommon. 
D) disjoint. 
A) shuffle. 
B) contains. 
C) hasCommon. 
D) disjoint.

Question 9

Which statement is false?

Accepted Answer

A) When a List is backed up with an array,any modifications made through the List view change the array. 
B) When a List is backed up with 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 up with an array,any modifications made through the List view change the array. 
B) When a List is backed up with 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 10

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 11

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.

Question 12

Most objects in Java can now be output and input with Java's object __________.

Accepted Answer

A) encapsulation. 
B) overloading. 
C) Serialization. 
D) reflection. 
A) encapsulation. 
B) overloading. 
C) Serialization. 
D) reflection.

Question 13

Which statement is false?

Accepted Answer

A) All built-in collections are synchronized. 
B) Concurrent access to a Collection by multiple threads could cause indeterminate results or fatal errors. 
C) To prevent potential threading problems,synchronization wrappers are used around collection classes that might be accessed by multiple threads. 
D) A synchronization wrapper class receives method calls,adds some functionality for thread safety and then delegates the calls to the wrapped class. 
A) All built-in collections are synchronized. 
B) Concurrent access to a Collection by multiple threads could cause indeterminate results or fatal errors. 
C) To prevent potential threading problems,synchronization wrappers are used around collection classes that might be accessed by multiple threads. 
D) A synchronization wrapper class receives method calls,adds some functionality for thread safety and then delegates the calls to the wrapped class.

Question 14

The collections framework provides various __________ collection interfaces from which the programmer can quickly "flesh out" complete customized implementations.

Accepted Answer

A) abstract. 
B) concrete. 
C) structured. 
D) unstructured. 
A) abstract. 
B) concrete. 
C) structured. 
D) unstructured.

Question 15

Map method ________ is used to determine whether a map contains a mapping for the specified key.

Accepted Answer

A) containsKey. 
B) hasKey. 
C) containsMapping. 
D) hasMapping. 
A) containsKey. 
B) hasKey. 
C) containsMapping. 
D) hasMapping.

Question 16

Java SE 7 supports type inferencing with the  notation in statements that declare and create generic type variables and objects.For example,the following line: List list = new ArrayList();
Can be written as:

Accepted Answer

A) List list = new ArrayList(); 
B) List list = new ArrayList(); 
C) List list = new ArrayList(); 
D) List list = new ArrayList(); 
A) List list = new ArrayList(); 
B) List list = new ArrayList(); 
C) List list = new ArrayList(); 
D) List list = new ArrayList();

Question 17

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

Accepted Answer

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

Question 18

If the desired Object is not found,binarySearch returns __________.

Accepted Answer

A) a positive value 
B) zero 
C) a negative value 
D) an ObjectNotFoundError. 
A) a positive value 
B) zero 
C) a negative value 
D) an ObjectNotFoundError.

Question 19

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 20

If no elements are in the Stack,method pop throws an __________.

Accepted Answer

A) OutOfMemoryError. 
B) OutOfMemoryException. 
C) EmptyStackError. 
D) EmptyStackException. 
A) OutOfMemoryError. 
B) OutOfMemoryException. 
C) EmptyStackError. 
D) EmptyStackException.

Exam 20: Generic Collections

A Properties object is a __________ Hashtable object.

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

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

__________ allows a program to walk through the collection and remove elements from the collection.

Which statement is false?

To find the smallest and largest element of a Collection,use Collections methods _________ and __________.

Which statement is false?

Collections method __________ returns true if two Collections have no elements in common.

Which statement is false?

Which statement is false?

Algorithm __________ randomly orders a List's elements.

Most objects in Java can now be output and input with Java's object __________.

Which statement is false?

The collections framework provides various __________ collection interfaces from which the programmer can quickly "flesh out" complete customized implementations.

Map method ________ is used to determine whether a map contains a mapping for the specified key.

Java SE 7 supports type inferencing with the <> notation in statements that declare and create generic type variables and objects.For example,the following line: List< String > list = new ArrayList< String >(); Can be written as:

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

If the desired Object is not found,binarySearch returns __________.

LinkedList method listIterator returns a(n)__________.

If no elements are in the Stack,method pop throws an __________.

Introduction to Computers and Java

Introduction to Java Applications

Introduction to Classes and Objects

Control Statements: Part 1

Control Statements: Part 2

Methods: a Deeper Look

Arrays and Arraylists

Classes and Objects: a Deeper Look

Object Oriented Programming: Inheritance

Object-Oriented Programming: Polymorphism

Exception Handling

Atm Case Study,part 1: Object-Oriented Design With the Uml

Atm Case Study,part 2: Implementing an Object-Oriented Design

Gui Components: Part 1

Graphics and Java 2d

Strings

Files,streams and Object Serialization

Recursion

Searching, Sorting and Big O

Generic Classes and Methods

Custom Generic Data Structures

Applets and Java Web Start

Multimedia: Applets and Applications

Gui, Part 2

Multithreading

Networking

Accessing Databases With Jdbc

Java Server Faces Web Applications

Ajax-Enabled Jsf Web Applications

Web Services

Filters

To find the smallest and largest element of a Collection,use Collections methods _ and __.