Question 1

Class Collections provides algorithms for reversing,filling and copying ________.

Accepted Answer

A) Lists. 
B) Collections. 
C) Arrays. 
D) Stacks. 
A) Lists. 
B) Collections. 
C) Arrays. 
D) Stacks.

Question 2

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 3

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 4

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 5

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 6

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 7

Which of the following performs a boxing conversion?

Accepted Answer

A) int x = 7; 
B) Integer x = 7; 
C) Neither of the above. 
D) Both of the above. 
A) int x = 7; 
B) Integer x = 7; 
C) Neither of the above. 
D) Both of the above.

Question 8

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 9

Collections method ___________ returns a Comparator object that orders the collection's elements in reverse order.

Accepted Answer

A) rotate. 
B) shuffle. 
C) reverse. 
D) reverseOrder. 
A) rotate. 
B) shuffle. 
C) reverse. 
D) reverseOrder.

Question 10

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.

Question 11

Which of the following does not implement interface List?

Accepted Answer

A) ArrayList. 
B) LinkedList. 
C) Vector. 
D) ListIterator. 
A) ArrayList. 
B) LinkedList. 
C) Vector. 
D) ListIterator.

Question 12

Which statement is false?

Accepted Answer

A) Each primitive type has a corresponding type-wrapper class. 
B) The type-wrapper classes enable you to manipulate primitive-type values as objects. 
C) Type-wrapper classes are final,so you cannot extend them. 
D) The methods for primitive types correspond to the methods for the corresponding type-wrapper classes. 
A) Each primitive type has a corresponding type-wrapper class. 
B) The type-wrapper classes enable you to manipulate primitive-type values as objects. 
C) Type-wrapper classes are final,so you cannot extend them. 
D) The methods for primitive types correspond to the methods for the corresponding type-wrapper classes.

Question 13

Iterator method __________ determines whether the Collection contains more elements.

Accepted Answer

A) hasNext. 
B) next. 
C) contains. 
D) containsNext. 
A) hasNext. 
B) next. 
C) contains. 
D) containsNext.

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

Objects of many classes 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 16

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 17

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

Accepted Answer

A) least,greatest. 
B) smallest,largest. 
C) first,last. 
D) min,max. 
A) least,greatest. 
B) smallest,largest. 
C) first,last. 
D) min,max.

Question 18

Which statement about hashing is false?

Accepted Answer

A) Hashing facilitates high-speed storing and retrieval of data. 
B) Two different data items can hash to the same cell;this is called a collision. 
C) A load factor of 0.5 usually results in good hashing performance,but less efficient utilization of memory. 
D) A load factor of 1.0 usually results in good hashing performance,but less efficient utilization of memory. 
A) Hashing facilitates high-speed storing and retrieval of data. 
B) Two different data items can hash to the same cell;this is called a collision. 
C) A load factor of 0.5 usually results in good hashing performance,but less efficient utilization of memory. 
D) A load factor of 1.0 usually results in good hashing performance,but less efficient utilization of memory.

Question 19

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 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

Class Collections provides algorithms for reversing,filling and copying ________.

Which statement is false?

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

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?

Method shuffle is a member of __________.

Which of the following performs a boxing conversion?

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

Collections method ___________ returns a Comparator object that orders the collection's elements in reverse order.

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

Which of the following does not implement interface List?

Which statement is false?

Iterator method __________ determines whether the Collection contains more elements.

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

Objects of many classes can now be output and input with Java's object __________.

Which statement is false?

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

Which statement about hashing is false?

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

Which statement is false?

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

Gui Components: Part 1

Graphics and Java 2D

Strings

Files,streams and Object Serialization

Lambdas

Recursion

Searching, Sorting and Big O

Generic Classes and Methods

Custom Generic Data Structures

Concurrency

Accessing Databases With Jdbc

JavaFX

Filters

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