Cop3252 Final

Front 1

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.

Back 1

polymorphic

Front 2

Back 2

9

Front 3

Back 3

Both (a) and (b)

Must implement a method called calculate

Will not be able to access the instance variable a

Front 4

In this question, assume a class, Book, has been defined. Which set of statements creates an array of Book objects?

Back 4

Book[] books;books = new Book[ numberElements ];

Front 5

When a subclass constructor calls its superclass constructor, what happens if the superclass’s constructor does not assign a value to an instance variable?

Back 5

The program compiles and runs because the instance variables are initialized to their default values

Front 6

The preferred means of creating multithreaded Java applications is by implementing the ________ interface. An object of a class that implements this interface represents a task to perform.

Back 6

Runnable

Front 7

__________ enable programmers to specify, with a single method declaration, a set of related methods.

Back 7

Generic methods

Front 8

The import declaration import *; ________.

Back 8

causes a compilation error.

Front 9

Which of the following should usually be private?

Back 9

Variables (or fields)

Front 10

Attributes of a class are also known as:

Back 10

Fields

Front 11

Which of the following statements about the continue statement is true?

Back 11

A continue statement proceeds with the next iteration of the immediately enclosing while, for, do…while statement.

Front 12

Non-abstract classes are called:

Back 12

concrete classes

Front 13

Back 13

This porridge is too hot.

Front 14

To exit out of a loop completely, and resume the flow of control at the next line in the method, use _______.

Back 14

A break statement.

Front 15

An uncaught exception:

Back 15

is an exception that occurs for which there are no matching catch clauses.

Front 16

When a __________ method or block is running on an object, the object is locked so no other such method can run on that object at the same time

Back 16

synchronized

Front 17

When no access modifier is specified for a method or variable, the method or variable:

Back 17

Has package access.

Front 18

Declaring main as ________ allows the JVM to invoke main without creating an instance of the class.

Back 18

static.

Front 19

Which statement best describes the relationship between superclass and subclass types?

Back 19

A subclass reference can be assigned to a superclass variable, but a superclass reference cannot be assigned to a subclass variable.

Front 20

Which superclass members are inherited by all subclasses of that superclass?

Back 20

protected instance variables and methods

Front 21

Declaring a method final means

Back 21

it cannot be overridden

Front 22

Which of the following is a valid fully qualified name?

Back 22

java.util.Scanner

Front 23

Which of the following statements about the break statement is false?

Back 23

The break statement, when executed in a while, for or do…while, skips the remaining statements in the loop body and proceeds with the next iteration of the loop

Front 24

Which of the following statements is false

Back 24

Information in the memory unit is persistent—it is retained when the computer's power is turned off.

Front 25

A(n) ________ enables a program to read data from the user.

Back 25

Scanner

Front 26

The control variable of a counter-controlled loop should be declared as ________to prevent errors.

Back 26

int

Front 27

Back 27

0

Front 28

Back 28

"This porridge is too hot."

"This porridge is just right."

Front 29

Back 29

if ( gender == 1 && age >= 65 ) ++seniorFemales;

Front 30

Polymorphism enables you to:

Back 30

program in the general

Front 31

Polymorphism allows for specifics to be dealt with during:

Back 31

execution

Front 32

All of the following methods are implicitly final except:

Back 32

a method in an abstract class

Front 33

All exception classes inherit, either directly or indirectly, from:

Back 33

class Throwable

Front 34

The main method executes in the _____ thread of exectution

Back 34

main

Front 35

To catch an exception, the code that might throw the exception must be enclosed in a

Back 35

try block

Front 36

A new thread begins its life cycle by transitioning to the ____ state.

Back 36

new

Front 37

Which of the following statements about try blocks is true?

Back 37

The try block should contain statements that may throw an exception

Front 38

In the catch block below, what is arithmeticException?

catch(ArithmeticException arithmeticException)

{

System.err.printf(arithmetricException);

} // end catch

Back 38

The name of catch block's exception parameter

Front 39

Which of the following is not true of ExecutorService

Back 39

It is an object that can be run in a separate thread

Front 40

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

Back 40

Comparable

Front 41

When the compiler translates a generic method into Java bytecodes, it uses _____ to replace the type parameters with actual types.

Back 41

erasure

Front 42

Which statement is false?

Back 42

A List cannot contain duplicate elements

Front 43

When a generic class is instantiated without specifying a type argument, it is said to have a _______

Back 43

raw type

Front 44

One generic Stack class could be the basis for creating many Stack classes, e.g., Stack, Stack and Stack. These classes are known as ________

Back 44

parameterized classes

Front 45

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

Back 45

Iterator

Front 46

T/F: A non-generic class cannot be derived from a generic class

Back 46

False

Front 47

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

Back 47

java.util

Front 48

T/F: With datagram sockets a process establishes a connectino to another process

Back 48

False

Front 49

T/F: UDP is a connection-oriented protocol

Back 49

False

Front 50

A(n) _____ is thrown when a String that is not in proper URL format is passed to a URL constructor

Back 50

MalformedURLException

Front 51

A JEditorPane generates HyperlinkEvents only if it is _______

Back 51

uneditable

Front 52

Once the ServerSocket is created, the server can listen indefinitely (or block) for an attempt by a client to connect. This is accomplished with a call to the ServerSocket method_____.

Back 52

accept

Front 53

Which statement is false? Normally, an applet ______

Back 53

can read files on any server that can be reached over the network

Front 54

A(n) ______ is thrown when a server address indicated by a client cannot be resolved

Back 54

UnknownHostException

Front 55

Using a URL as an argument to the ______ method of interface AppletContext causes the browser to which an applet is executing to display the URL

Back 55

showDocument

Front 56

______ sockets and the ________ protocol are more desirable for the vast majority of Java programmers

Back 56

Stream, TCP

Front 57

If an ObjectInputStream is used to read information from the server, an ____ is generated when the client attempts to read a value from a stream on which end-of-stream is detected

Back 57

EOFException