Question 1

When a program throws an exception within a method that has no try-catch block, which of the following statements about exception handling is true?

Accepted Answer

A) The user must decide whether to continue or terminate the program. 
B) The current method must decide whether to continue or terminate. 
C) The current method terminates immediately. 
D) Execution will continue with the next statement in the method. 
A) The user must decide whether to continue or terminate the program. 
B) The current method must decide whether to continue or terminate. 
C) The current method terminates immediately. 
D) Execution will continue with the next statement in the method.

Question 2

Which of the following statements about assertions is NOT true?

Accepted Answer

A) An assertion is always checked during program execution. 
B) If an executed assertion fails, then the assert statement throws an AssertionError exception. 
C) Assertion checking is particularly useful during program development and testing. 
D) An assertion checks that a condition is true in a particular program location. 
A) An assertion is always checked during program execution. 
B) If an executed assertion fails, then the assert statement throws an AssertionError exception. 
C) Assertion checking is particularly useful during program development and testing. 
D) An assertion checks that a condition is true in a particular program location.

Question 3

Under which condition will the Scanner constructor generate a FileNotFoundException?

Accepted Answer

A) If the input file already exists, but is empty. 
B) If the input file does not exist. 
C) If any I/O error occurs while opening the file. 
D) If the input file already exists, but has data in it. 
A) If the input file already exists, but is empty. 
B) If the input file does not exist. 
C) If any I/O error occurs while opening the file. 
D) If the input file already exists, but has data in it.

Question 4

Consider the following code snippet.   Which of the following statements about this code is correct?

Accepted Answer

A) The methods of the Scanner class can be used on line to scan the string. 
B) The methods of the Scanner class can be used on lineScanner to scan the string. 
C) This code will not compile because a Scanner cannot be constructed on a String. 
D) This code compiles but generates a run-time exception. 
A) The methods of the Scanner class can be used on line to scan the string. 
B) The methods of the Scanner class can be used on lineScanner to scan the string. 
C) This code will not compile because a Scanner cannot be constructed on a String. 
D) This code compiles but generates a run-time exception.

Question 5

Insert the missing code in the following code fragment.This fragment is intended to read a web page.

Accepted Answer

A) new Scanner(pageLocation.openStream()) 
B) new Scanner(new File(pageLocation)) 
C) new Scanner("http://horstmann.com/index.html") 
D) new Scanner(pageLocation) 
A) new Scanner(pageLocation.openStream()) 
B) new Scanner(new File(pageLocation)) 
C) new Scanner("http://horstmann.com/index.html") 
D) new Scanner(pageLocation)

Question 6

Your program wishes to open a file named C:\java\myProg\input.txt on a Windows system.Which of the following is the correct code to do this?

Accepted Answer

A) inputFile = new File("c:\java\myProg\input.txt"); 
B) inputFile = new File.open("c:\java\myProg\input.txt"); 
C) inputFile = new File("c:\java\myProg\input.txt"); 
D) inputFile = new File.open("c:\java\myProg\input.txt"); 
A) inputFile = new File("c:\java\myProg\input.txt"); 
B) inputFile = new File.open("c:\java\myProg\input.txt"); 
C) inputFile = new File("c:\java\myProg\input.txt"); 
D) inputFile = new File.open("c:\java\myProg\input.txt");

Question 7

An example of a fatal error that rarely occurs and is beyond your control is the ____.

Accepted Answer

A) FileNotFoundException 
B) NumberFormatException 
C) RuntimeException 
D) OutOfMemoryError 
A) FileNotFoundException 
B) NumberFormatException 
C) RuntimeException 
D) OutOfMemoryError

Question 8

Insert the missing code in the following code fragment.This fragment is intended to read an input file named dataIn.txt and write to an output file named dataOut.txt.

Accepted Answer

A) new File("dataIn.txt") 
B) new Scanner(inputFile) 
C) new Scanner("dataIn.txt") 
D) new File(inputFileName) 
A) new File("dataIn.txt") 
B) new Scanner(inputFile) 
C) new Scanner("dataIn.txt") 
D) new File(inputFileName)

Question 9

Which of the following statements about command line arguments is correct?

Accepted Answer

A) You must declare additional parameters in the main method to receive command line argument values. 
B) You cannot pass arguments to a program when starting the program from a command line prompt. 
C) Command line arguments can be read using the main method's args parameter. 
D) Command line arguments must be read with a Scanner object. 
A) You must declare additional parameters in the main method to receive command line argument values. 
B) You cannot pass arguments to a program when starting the program from a command line prompt. 
C) Command line arguments can be read using the main method's args parameter. 
D) Command line arguments must be read with a Scanner object.

Question 10

Insert the missing code in the following code fragment.This fragment is intended to read an input file named hoursWorked.txt.You want the program to terminate if the file does not exist.

Accepted Answer

A) throws FileMissingException 
B) catch FileNotFoundException 
C) catch FileMissingException 
D) throws FileNotFoundException 
A) throws FileMissingException 
B) catch FileNotFoundException 
C) catch FileMissingException 
D) throws FileNotFoundException

Question 11

Assuming that inputFile is a Scanner object used to read words from a text file, select an expression to complete the following code segment, which counts the number of words in the input file.

Accepted Answer

A) inputFile.nextString() 
B) inputFile.nextDouble() 
C) inputFile.next() 
D) inputFile.nextInt() 
A) inputFile.nextString() 
B) inputFile.nextDouble() 
C) inputFile.next() 
D) inputFile.nextInt()

Question 12

Which method of an exception object will provide information about the chain of method calls that led to the exception?

Accepted Answer

A) printStackTrace() 
B) getCallStack() 
C) printCallStack() 
D) getStackTrace() 
A) printStackTrace() 
B) getCallStack() 
C) printCallStack() 
D) getStackTrace()

Question 13

You have opened a command prompt window and you have entered the following:
java myProg Bob Smith
Which of the following statements is correct?

Accepted Answer

A) You have supplied two argument values, and these values can be accessed in the main method using the args parameter. 
B) You have supplied one argument value, and this value can be accessed in the main method using the arg1 parameter. 
C) You have supplied one argument value, and this value can be accessed in the main method using the args parameter. 
D) You have supplied two argument values, and these values can be accessed in the main method using the arg1 and arg2 parameters. 
A) You have supplied two argument values, and these values can be accessed in the main method using the args parameter. 
B) You have supplied one argument value, and this value can be accessed in the main method using the arg1 parameter. 
C) You have supplied one argument value, and this value can be accessed in the main method using the args parameter. 
D) You have supplied two argument values, and these values can be accessed in the main method using the arg1 and arg2 parameters.

Question 14

Consider the following code snippet:   What characters will be ignored and not read in when using this code?

Accepted Answer

A) Only numeric characters will be ignored. 
B) Only non-alphabetic characters will be ignored. 
C) Only alphabetic characters will be ignored. 
D) Only non-numeric characters will be ignored. 
A) Only numeric characters will be ignored. 
B) Only non-alphabetic characters will be ignored. 
C) Only alphabetic characters will be ignored. 
D) Only non-numeric characters will be ignored.

Question 15

Insert the missing code in the following code fragment.This fragment is intended to read an input file named dataIn.txt that resides in a folder named payroll on the C: drive of a Windows system.

Accepted Answer

A) new File(c://payroll//"dataIn.txt") 
B) new File("c:\payroll\dataIn.txt") 
C) new File("c:\payroll\dataIn.txt") 
D) new File(c:/payroll/"dataIn.txt") 
A) new File(c://payroll//"dataIn.txt") 
B) new File("c:\payroll\dataIn.txt") 
C) new File("c:\payroll\dataIn.txt") 
D) new File(c:/payroll/"dataIn.txt")

Question 16

Which of the following statements about white space in Java is correct?

Accepted Answer

A) In Java, white space includes spaces, tab characters, newline characters, and punctuation. 
B) In Java, white space includes spaces and tab characters only. 
C) In Java, white space includes spaces, tab characters, and newline characters. 
D) In Java, white space includes spaces only. 
A) In Java, white space includes spaces, tab characters, newline characters, and punctuation. 
B) In Java, white space includes spaces and tab characters only. 
C) In Java, white space includes spaces, tab characters, and newline characters. 
D) In Java, white space includes spaces only.

Question 17

Insert the missing code in the following code fragment.This fragment is intended to read an input file named dataIn.txt.

Accepted Answer

A) finally FileNotFoundException 
B) throws FileNotFoundException 
C) extends FileNotFoundException 
D) catches FileNotFoundException 
A) finally FileNotFoundException 
B) throws FileNotFoundException 
C) extends FileNotFoundException 
D) catches FileNotFoundException

Question 18

Which of the following code snippets about exceptions is correct?

Accepted Answer

A) public void read(String filename) throw (IOException, ClassNotFoundException) 
B) public void read(String filename) throw IOException, ClassNotFoundException 
C) public void read(String filename) throws IOException, ClassNotFoundException 
D) public void read(String filename) throws IOException, throws ClassNotFoundException 
A) public void read(String filename) throw (IOException, ClassNotFoundException) 
B) public void read(String filename) throw IOException, ClassNotFoundException 
C) public void read(String filename) throws IOException, ClassNotFoundException 
D) public void read(String filename) throws IOException, throws ClassNotFoundException

Question 19

Your program will read in an existing text file.You want the program to terminate if the file does not exist.Which of the following indicates the correct code for the main method header?

Accepted Answer

A) public static void main(String[] args) throws FileNotFoundException 
B) public static void main(String[] args) throws UnknownFileException 
C) public static void main(String[] args) 
D) public static void main(String[] args) throws FileMissingException 
A) public static void main(String[] args) throws FileNotFoundException 
B) public static void main(String[] args) throws UnknownFileException 
C) public static void main(String[] args) 
D) public static void main(String[] args) throws FileMissingException

Question 20

Insert the missing code in the following code fragment.This fragment is intended to read a file named dataIn.txt and write to a file named dataOut.txt.

Accepted Answer

A) new PrintWriter(outputFile) 
B) new PrintWriter(outputFileName) 
C) new Scanner(outputFile) 
D) new Scanner(outputFileName) 
A) new PrintWriter(outputFile) 
B) new PrintWriter(outputFileName) 
C) new Scanner(outputFile) 
D) new Scanner(outputFileName)

Exam 11: Input/Output and Exception Handling

When a program throws an exception within a method that has no try-catch block, which of the following statements about exception handling is true?

Which of the following statements about assertions is NOT true?

Under which condition will the Scanner constructor generate a FileNotFoundException?

Consider the following code snippet. Which of the following statements about this code is correct?

Insert the missing code in the following code fragment.This fragment is intended to read a web page.

Your program wishes to open a file named C:\java\myProg\input.txt on a Windows system.Which of the following is the correct code to do this?

An example of a fatal error that rarely occurs and is beyond your control is the ____.

Insert the missing code in the following code fragment.This fragment is intended to read an input file named dataIn.txt and write to an output file named dataOut.txt.

Which of the following statements about command line arguments is correct?

Insert the missing code in the following code fragment.This fragment is intended to read an input file named hoursWorked.txt.You want the program to terminate if the file does not exist.

Assuming that inputFile is a Scanner object used to read words from a text file, select an expression to complete the following code segment, which counts the number of words in the input file.

Which method of an exception object will provide information about the chain of method calls that led to the exception?

You have opened a command prompt window and you have entered the following: java myProg Bob Smith Which of the following statements is correct?

Consider the following code snippet: What characters will be ignored and not read in when using this code?

Insert the missing code in the following code fragment.This fragment is intended to read an input file named dataIn.txt that resides in a folder named payroll on the C: drive of a Windows system.

Which of the following statements about white space in Java is correct?

Insert the missing code in the following code fragment.This fragment is intended to read an input file named dataIn.txt.

Which of the following code snippets about exceptions is correct?

Your program will read in an existing text file.You want the program to terminate if the file does not exist.Which of the following indicates the correct code for the main method header?

Insert the missing code in the following code fragment.This fragment is intended to read a file named dataIn.txt and write to a file named dataOut.txt.

Introduction

Using Objects

Implementing Classes

Fundamental Data Types

Decisions

Loops

Arrays and Array Lists

Designing Classes

Inheritance

Interfaces

Object-Oriented Design

Recursion

Sorting and Searching

The Java Collections Framework

Basic Data Structures

Tree Structures

Generic Classes

Stream Processing

Graphical User Interfaces

Advanced Input/Output

Multithreading

Internet Networking

Relational Databases

XML

Filters