Question 1

Insert the missing code in the following code fragment.This fragment is intended to allow the user to select a file to be opened.

Accepted Answer

A) chooser.getFileName() 
B) chooser.getSelectedFileName() 
C) chooser.getSelectedFile() 
D) chooser.getFilePath() 
A) chooser.getFileName() 
B) chooser.getSelectedFileName() 
C) chooser.getSelectedFile() 
D) chooser.getFilePath() C

Question 2

Select an appropriate expression to complete the header for the method below.

Accepted Answer

A) throws new FileNotFoundException 
B) throw FileNotFoundException 
C) throw new FileNotFoundException 
D) throws FileNotFoundException 
A) throws new FileNotFoundException 
B) throw FileNotFoundException 
C) throw new FileNotFoundException 
D) throws FileNotFoundException D

Question 3

The ______ method of the Scanner class specifies a pattern for word boundaries when reading text.

Accepted Answer

A) setDelimiter() 
B) usePattern() 
C) useDelimiter() 
D) setPattern() 
A) setDelimiter() 
B) usePattern() 
C) useDelimiter() 
D) setPattern() C

Question 4

Which command enables assertion checking during program execution?

Accepted Answer

A) java -enableassertions MainClass 
B) javac -enableassertions MainClass 
C) javac -ea MainClass 
D) java -assertions MainClass 
A) java -enableassertions MainClass 
B) javac -enableassertions MainClass 
C) javac -ea MainClass 
D) java -assertions MainClass

Question 5

Which of the following statements about character encodings is NOT true?

Accepted Answer

A) It is recommended to specify the UTF-8 encoding when processing files with special symbols or characters in multiple languages. 
B) Java assumes the UTF-8 encoding. 
C) A character is encoded as a sequence of bytes, each having a value between 0 and 255. 
D) Java supports the reading and writing of files in the UTF-8 encoding. 
A) It is recommended to specify the UTF-8 encoding when processing files with special symbols or characters in multiple languages. 
B) Java assumes the UTF-8 encoding. 
C) A character is encoded as a sequence of bytes, each having a value between 0 and 255. 
D) Java supports the reading and writing of files in the UTF-8 encoding.

Question 6

Insert the missing code in the following code fragment.This code is intended to open a file and handle the situation where the file cannot be found.

Accepted Answer

A) {Scanner in = new Scanner(inputFile)} 
B) (Scanner in = new Scanner(inputFile)) 
C) Scanner in = new Scanner(inputFile); 
D) (FileNotFound exception) 
A) {Scanner in = new Scanner(inputFile)} 
B) (Scanner in = new Scanner(inputFile)) 
C) Scanner in = new Scanner(inputFile); 
D) (FileNotFound exception)

Question 7

Consider the following code snippet:   What characters will be read in using this code?

Accepted Answer

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

Question 8

Which method of an exception object will retrieve a description of the exception that occurred?

Accepted Answer

A) printStackTrace() 
B) printMessage() 
C) getDescription() 
D) getMessage() 
A) printStackTrace() 
B) printMessage() 
C) getDescription() 
D) getMessage()

Question 9

Which of the following statements about exception handling is correct?

Accepted Answer

A) Statements that may cause an exception should be placed within a catch block. 
B) Statements that may cause an exception should be placed within a try block. 
C) The main method of a Java program will handle any error encountered in the program. 
D) Statements that may cause an exception should be placed within a throws block. 
A) Statements that may cause an exception should be placed within a catch block. 
B) Statements that may cause an exception should be placed within a try block. 
C) The main method of a Java program will handle any error encountered in the program. 
D) Statements that may cause an exception should be placed within a throws block.

Question 10

Consider the following code snippet:
File inputFile = new File("input.txt");
You wish to read the contents of this file using a Scanner object.Which of the following is the correct syntax for doing this?

Accepted Answer

A) Scanner in = new Scanner("input.txt"); 
B) Scanner in = new Scanner(inputFile); 
C) Scanner in = Scanner.open(inputFile); 
D) Scanner in = Scanner("input.txt"); 
A) Scanner in = new Scanner("input.txt"); 
B) Scanner in = new Scanner(inputFile); 
C) Scanner in = Scanner.open(inputFile); 
D) Scanner in = Scanner("input.txt");

Question 11

Consider the following code snippet.
File hoursFile = new File("hoursWorked.txt");
Your program must read the contents of this file using a Scanner object.Which of the following is the correct syntax for doing this?

Accepted Answer

A) Scanner in = new Scanner("hoursWorked.txt"); 
B) Scanner in = new Scanner(hoursFile); 
C) Scanner in = Scanner.open(hoursFile); 
D) Scanner in = Scanner("hoursWorked.txt"); 
A) Scanner in = new Scanner("hoursWorked.txt"); 
B) Scanner in = new Scanner(hoursFile); 
C) Scanner in = Scanner.open(hoursFile); 
D) Scanner in = Scanner("hoursWorked.txt");

Question 12

Consider the following code snippet, assuming that filename represents the name of the output file and writeData outputs the data to that file:   Which of the following statements about this code is correct?

Accepted Answer

A) The close method of the outputFile object will be automatically invoked when the try block ends, but only if no exception occurred. 
B) The program will terminate with an unhandled exception if the PrintWriter constructor fails. 
C) The close method of the outputFile object will be automatically invoked when the try block ends, whether or not an exception has occurred. 
D) The close method of the outputFile object will be automatically invoked when the try block ends, but only if an exception occurs. 
A) The close method of the outputFile object will be automatically invoked when the try block ends, but only if no exception occurred. 
B) The program will terminate with an unhandled exception if the PrintWriter constructor fails. 
C) The close method of the outputFile object will be automatically invoked when the try block ends, whether or not an exception has occurred. 
D) The close method of the outputFile object will be automatically invoked when the try block ends, but only if an exception occurs.

Question 13

Consider the following code snippet, where data is a variable defined as a double array that is populated by the readData method for valid data:   Which of the following statements about this method's code is correct?

Accepted Answer

A) Any exceptions that occur in this method will be suppressed. 
B) This method will pass any IOException-type exception back to the caller. 
C) The method will never close the file if an IOException exception occurs in this method. 
D) This method will pass any type of exception back to the caller. 
A) Any exceptions that occur in this method will be suppressed. 
B) This method will pass any IOException-type exception back to the caller. 
C) The method will never close the file if an IOException exception occurs in this method. 
D) This method will pass any type of exception back to the caller.

Question 14

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

Accepted Answer

A) The main method is designed to catch and handle all types of exceptions. 
B) The main method will not terminate if any exception occurs. 
C) The main method is designed to catch and handle the FileNotFoundException. 
D) The main method terminates if the FileNotFoundException occurs. 
A) The main method is designed to catch and handle all types of exceptions. 
B) The main method will not terminate if any exception occurs. 
C) The main method is designed to catch and handle the FileNotFoundException. 
D) The main method terminates if the FileNotFoundException occurs.

Question 15

Which of the following statements about checked and unchecked exceptions is NOT true?

Accepted Answer

A) Handling of checked exceptions is enforced by the compiler. 
B) Unchecked exceptions are the programmer's fault. 
C) Unchecked exceptions belonging to subclasses of the RunTimeException class are beyond the control of the programmer. 
D) Internal errors belonging to subclasses of the Error class are beyond the control of the programmer. 
A) Handling of checked exceptions is enforced by the compiler. 
B) Unchecked exceptions are the programmer's fault. 
C) Unchecked exceptions belonging to subclasses of the RunTimeException class are beyond the control of the programmer. 
D) Internal errors belonging to subclasses of the Error class are beyond the control of the programmer.

Question 16

Complete the code fragment below, which is designed to throw an exception if String variable accountNumber has more than seven characters.

Accepted Answer

A) throws new IllegalArgumentException("Account number exceeds maximum length"); 
B) throw new IllegalArgumentException("Account number exceeds maximum length"); 
C) throws IllegalArgumentException("Account number exceeds maximum length"); 
D) throw IllegalArgumentException("Account number exceeds maximum length"); 
A) throws new IllegalArgumentException("Account number exceeds maximum length"); 
B) throw new IllegalArgumentException("Account number exceeds maximum length"); 
C) throws IllegalArgumentException("Account number exceeds maximum length"); 
D) throw IllegalArgumentException("Account number exceeds maximum length");

Question 17

Assume inputFile is a Scanner object used to read data from a text file that contains a number of lines.Each line contains an arbitrary number of words, with at least one word per line.Select an expression to complete the following code segment, which prints the last word in each line.

Accepted Answer

A) words.hasNext() 
B) line.hasNext() 
C) words.hasNextInt() 
D) inputFile.hasNext() 
A) words.hasNext() 
B) line.hasNext() 
C) words.hasNextInt() 
D) inputFile.hasNext()

Question 18

Insert the missing code in the following code fragment.This fragment is intended to read characters from a text file.

Accepted Answer

A) in.getNext() 
B) in.next().charAt(0) 
C) in.next() 
D) in.nextChar() 
A) in.getNext() 
B) in.next().charAt(0) 
C) in.next() 
D) in.nextChar()

Question 19

Which String class method will remove spaces from the beginning and the end of a string?

Accepted Answer

A) clean() 
B) strip() 
C) truncate() 
D) trim() 
A) clean() 
B) strip() 
C) truncate() 
D) trim()

Question 20

Consider the following code snippet:
public static void main(String[] args) throws IOException
Which of the following statements about this code is correct?

Accepted Answer

A) The main method will not terminate if any exception occurs. 
B) The main method is designed to catch and handle all types of exceptions. 
C) The main method is designed to catch and handle the IOException. 
D) The main method terminates if the IOException occurs. 
A) The main method will not terminate if any exception occurs. 
B) The main method is designed to catch and handle all types of exceptions. 
C) The main method is designed to catch and handle the IOException. 
D) The main method terminates if the IOException occurs.

Exam 11: Input/Output and Exception Handling

Insert the missing code in the following code fragment.This fragment is intended to allow the user to select a file to be opened.

Select an appropriate expression to complete the header for the method below.

The ______ method of the Scanner class specifies a pattern for word boundaries when reading text.

Which command enables assertion checking during program execution?

Which of the following statements about character encodings is NOT true?

Insert the missing code in the following code fragment.This code is intended to open a file and handle the situation where the file cannot be found.

Consider the following code snippet: What characters will be read in using this code?

Which method of an exception object will retrieve a description of the exception that occurred?

Which of the following statements about exception handling is correct?

Consider the following code snippet: File inputFile = new File("input.txt"); You wish to read the contents of this file using a Scanner object.Which of the following is the correct syntax for doing this?

Consider the following code snippet. File hoursFile = new File("hoursWorked.txt"); Your program must read the contents of this file using a Scanner object.Which of the following is the correct syntax for doing this?

Consider the following code snippet, assuming that filename represents the name of the output file and writeData outputs the data to that file: Which of the following statements about this code is correct?

Consider the following code snippet, where data is a variable defined as a double array that is populated by the readData method for valid data: Which of the following statements about this method's code is correct?

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

Which of the following statements about checked and unchecked exceptions is NOT true?

Complete the code fragment below, which is designed to throw an exception if String variable accountNumber has more than seven characters.

Assume inputFile is a Scanner object used to read data from a text file that contains a number of lines.Each line contains an arbitrary number of words, with at least one word per line.Select an expression to complete the following code segment, which prints the last word in each line.

Insert the missing code in the following code fragment.This fragment is intended to read characters from a text file.

Which String class method will remove spaces from the beginning and the end of a string?

Consider the following code snippet: public static void main(String[] args) throws IOException Which of the following statements about this code is correct?

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

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