Question 1

Which method of the JFileChooser object will return the file object that describes the file chosen by the user at runtime?

Accepted Answer

A) getSelectedFilePath() 
B) getSelectedFile() 
C) getFilePath() 
D) getFile() 
A) getSelectedFilePath() 
B) getSelectedFile() 
C) getFilePath() 
D) getFile()

Question 2

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(inputFile) 
B) new File(System.in) 
C) new File(outputFileName) 
D) new File(inputFileName) 
A) new File(inputFile) 
B) new File(System.in) 
C) new File(outputFileName) 
D) new File(inputFileName)

Question 3

Which of the following statements reflects the recommendations about closing files?

Accepted Answer

A) Only the output file must be explicitly closed in the program. 
B) Both the input and the output file should be explicitly closed in the program. 
C) Only the input file must be explicitly closed in the program. 
D) Both the input and the output file should not be explicitly closed in the program. 
A) Only the output file must be explicitly closed in the program. 
B) Both the input and the output file should be explicitly closed in the program. 
C) Only the input file must be explicitly closed in the program. 
D) Both the input and the output file should not be explicitly closed in the program.

Question 4

Consider the following code snippet:   How can the program ensure that the file will be closed if an exception occurs on the writeData call?

Accepted Answer

A) The program should place the outputFile.close() statement within a try block to ensure that the file will be closed. 
B) The program should declare the PrintWriter variable in a try-with-resources statement to ensure that the file is closed. 
C) It is not possible to ensure that the file will be closed when the exception occurs. 
D) The program does not need to take any action, because the output file will be automatically closed when the exception occurs. 
A) The program should place the outputFile.close() statement within a try block to ensure that the file will be closed. 
B) The program should declare the PrintWriter variable in a try-with-resources statement to ensure that the file is closed. 
C) It is not possible to ensure that the file will be closed when the exception occurs. 
D) The program does not need to take any action, because the output file will be automatically closed when the exception occurs.

Question 5

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) throws FileNotFound 
B) throws IllegalArgumentException 
C) throws IOException exception 
D) throws IOException 
A) throws FileNotFound 
B) throws IllegalArgumentException 
C) throws IOException exception 
D) throws IOException

Question 6

Consider the following code snippet:   If there is no integer number appearing next in the input, what will occur?

Accepted Answer

A) ageValue will contain a null value. 
B) ageValue will contain a zero. 
C) An exception will occur. 
D) ageValue will contain whatever characters are encountered. 
A) ageValue will contain a null value. 
B) ageValue will contain a zero. 
C) An exception will occur. 
D) ageValue will contain whatever characters are encountered.

Question 7

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

Accepted Answer

A) This code will not catch a FileNotFoundException that occurs in the try block. 
B) This code will not catch any exceptions that occur in the try block. 
C) This code will pass any exceptions back to its caller. 
D) This code will catch exceptions that occur in the try block but will do nothing about the exceptions. 
A) This code will not catch a FileNotFoundException that occurs in the try block. 
B) This code will not catch any exceptions that occur in the try block. 
C) This code will pass any exceptions back to its caller. 
D) This code will catch exceptions that occur in the try block but will do nothing about the exceptions.

Question 8

Which Java class implements a file dialog box for selecting a file by a program with a graphical user interface?

Accepted Answer

A) JOptionPane 
B) JFileChooser 
C) JFilePane 
D) JFileOption 
A) JOptionPane 
B) JFileChooser 
C) JFilePane 
D) JFileOption

Question 9

The Java compiler requires that your program handle which type of exceptions?

Accepted Answer

A) severe 
B) fatal 
C) checked 
D) unchecked 
A) severe 
B) fatal 
C) checked 
D) unchecked

Question 10

Which of the following objects should be used for reading from a text file?

Accepted Answer

A) Scanner 
B) PrintStream 
C) ReadStream 
D) ReadFile 
A) Scanner 
B) PrintStream 
C) ReadStream 
D) ReadFile

Question 11

Which of the following statements about using a PrintWriter object is NOT true?

Accepted Answer

A) PrintWriter is an enhancement of the PrintStream class. 
B) A program can write to a PrintWriter using println. 
C) A PrintWriter will be automatically closed when the program exits. 
D) Data loss may occur if a program fails to close a PrintWriter object before exiting. 
A) PrintWriter is an enhancement of the PrintStream class. 
B) A program can write to a PrintWriter using println. 
C) A PrintWriter will be automatically closed when the program exits. 
D) Data loss may occur if a program fails to close a PrintWriter object before exiting.

Question 12

Which return value of the JFileChooser object's showOpenDialog method indicates that a file was chosen by the user at run time?

Accepted Answer

A) OK_OPTION 
B) SELECTED_OPTION 
C) CANCEL_OPTION 
D) APPROVE_OPTION 
A) OK_OPTION 
B) SELECTED_OPTION 
C) CANCEL_OPTION 
D) APPROVE_OPTION

Question 13

Under which condition will the PrintWriter constructor generate a FileNotFoundException?

Accepted Answer

A) If the output file does not exist. 
B) If the output file cannot be opened or created due to a security error. 
C) If the output file already exists, but is empty. 
D) If the output file already exists, but has data in it. 
A) If the output file does not exist. 
B) If the output file cannot be opened or created due to a security error. 
C) If the output file already exists, but is empty. 
D) If the output file already exists, but has data in it.

Question 14

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

Accepted Answer

A) This code will read in one word at a time from the input file. 
B) This code will read in one floating point value at a time from the input file. 
C) This code will read in one character at a time from the input file. 
D) This code will read in the entire input file in one operation. 
A) This code will read in one word at a time from the input file. 
B) This code will read in one floating point value at a time from the input file. 
C) This code will read in one character at a time from the input file. 
D) This code will read in the entire input file in one operation.

Question 15

Consider the following code snippet:
PrintWriter out = new PrintWriter("output.txt");
If a file named "output.txt" already exists, which of the following statements about the PrintWriter object is correct?

Accepted Answer

A) An exception will occur. 
B) Existing data will be deleted before data are added to the file. 
C) A new file named "output_1.txt" will be created and used. 
D) Data will be added at the end of the file. 
A) An exception will occur. 
B) Existing data will be deleted before data are added to the file. 
C) A new file named "output_1.txt" will be created and used. 
D) Data will be added at the end of the file.

Question 16

Which of the following patterns should be used for the delimiter to read one character at a time using a Scanner object's next method?

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)

Question 17

Consider the following code snippet:   What characters will be ignored and not read in 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 18

Insert the missing code in the following code fragment.This fragment is intended to read floating-point numbers from a text file.

Accepted Answer

A) in.getNextDouble() 
B) in.hasNextDouble() 
C) in.hasNextInt() 
D) in.peek() 
A) in.getNextDouble() 
B) in.hasNextDouble() 
C) in.hasNextInt() 
D) in.peek()

Question 19

What is the purpose of the throw statement?

Accepted Answer

A) It is used to pass control to an error handler when an error situation is detected. 
B) It is used to discard erroneous input. 
C) It is used to detect an error situation. 
D) It is used to pass arguments to another method. 
A) It is used to pass control to an error handler when an error situation is detected. 
B) It is used to discard erroneous input. 
C) It is used to detect an error situation. 
D) It is used to pass arguments to another method.

Question 20

When writing a method, which of the following statements about exception handling is true?

Accepted Answer

A) The throws clause must list all checked exceptions that this method may throw, and may also list unchecked exceptions. 
B) The throws clause must list all checked exceptions, but cannot list unchecked exceptions. 
C) The throws clause must list all unchecked exceptions, and cannot list checked exceptions. 
D) The throws clause must list all unchecked exceptions, and may also list checked exceptions that this method may throw. 
A) The throws clause must list all checked exceptions that this method may throw, and may also list unchecked exceptions. 
B) The throws clause must list all checked exceptions, but cannot list unchecked exceptions. 
C) The throws clause must list all unchecked exceptions, and cannot list checked exceptions. 
D) The throws clause must list all unchecked exceptions, and may also list checked exceptions that this method may throw.

Exam 11: Input/Output and Exception Handling

Which method of the JFileChooser object will return the file object that describes the file chosen by the user at runtime?

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 reflects the recommendations about closing files?

Consider the following code snippet: How can the program ensure that the file will be closed if an exception occurs on the writeData call?

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: If there is no integer number appearing next in the input, what will occur?

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

Which Java class implements a file dialog box for selecting a file by a program with a graphical user interface?

The Java compiler requires that your program handle which type of exceptions?

Which of the following objects should be used for reading from a text file?

Which of the following statements about using a PrintWriter object is NOT true?

Which return value of the JFileChooser object's showOpenDialog method indicates that a file was chosen by the user at run time?

Under which condition will the PrintWriter constructor generate a FileNotFoundException?

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

Consider the following code snippet: PrintWriter out = new PrintWriter("output.txt"); If a file named "output.txt" already exists, which of the following statements about the PrintWriter object is correct?

Which of the following patterns should be used for the delimiter to read one character at a time using a Scanner object's next method?

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

Insert the missing code in the following code fragment.This fragment is intended to read floating-point numbers from a text file.

What is the purpose of the throw statement?

When writing a method, which of the following statements about exception handling is true?

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