Question 1

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

Accepted Answer

A) Both alphabetic and numeric characters will be ignored. 
B) Only numeric characters will be ignored. 
C) Characters that are neither alphabetic nor numeric will be ignored. 
D) Only alphabetic characters will be ignored. 
A) Both alphabetic and numeric characters will be ignored. 
B) Only numeric characters will be ignored. 
C) Characters that are neither alphabetic nor numeric will be ignored. 
D) Only alphabetic characters will be ignored.

Question 2

Select an expression to complete the program segment below, which is designed to read data from a file whose name is specified as the first command line argument.If no command line arguments are given, the program reads data from the default.txt file.

Accepted Answer

A) args > 0 
B) args[0] != null 
C) args.length >= 0 
D) args.length > 0 
A) args > 0 
B) args[0] != null 
C) args.length >= 0 
D) args.length > 0

Question 3

Which of the following is the correct syntax for starting a Java program named myProg from a command line if the program requires two arguments named arg1 and arg2 to be supplied?

Accepted Answer

A) java myProg(arg1, arg2) 
B) java myProg "arg1" "arg2" 
C) java myProg arg1 arg2 
D) java myProg arg1, arg2 
A) java myProg(arg1, arg2) 
B) java myProg "arg1" "arg2" 
C) java myProg arg1 arg2 
D) java myProg arg1, arg2

Question 4

Which of the following statements about using the PrintWriter object is correct?

Accepted Answer

A) If the output file does not exist, a FileNotFoundException will occur. 
B) If the output file already exists, the new data will be appended to the end of the file. 
C) If the output file does not exist, an IllegalArgumentException will occur. 
D) If the output file already exists, the existing data will be discarded before new data are written into the file. 
A) If the output file does not exist, a FileNotFoundException will occur. 
B) If the output file already exists, the new data will be appended to the end of the file. 
C) If the output file does not exist, an IllegalArgumentException will occur. 
D) If the output file already exists, the existing data will be discarded before new data are written into the file.

Question 5

Assume inputFile is a Scanner object used to read data from a text file that contains a number of lines.Some lines contain an alphabetic string, while others contain a single integer value.Select an expression to complete the following code segment, which counts the number of integer values in the input file.

Accepted Answer

A) inputFile.hasNext() 
B) inputFile.hasNextInt() 
C) Character.isDigit(inputFile.next()) 
D) inputFile.nextInt() 
A) inputFile.hasNext() 
B) inputFile.hasNextInt() 
C) Character.isDigit(inputFile.next()) 
D) inputFile.nextInt()

Question 6

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

Accepted Answer

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

Question 7

Insert the missing code in the following code fragment.This fragment is intended to write an output file named dataOut.txt that resides in a folder named reports on the C: drive of a Windows system.

Accepted Answer

A) new PrintWriter("c:\reports\dataOut.txt") 
B) new PrintWriter("c:/reports/dataOut.txt") 
C) new PrintWriter("c://reports//dataOut.txt") 
D) new PrintWriter("c:eports\dataOut.txt") 
A) new PrintWriter("c:\reports\dataOut.txt") 
B) new PrintWriter("c:/reports/dataOut.txt") 
C) new PrintWriter("c://reports//dataOut.txt") 
D) new PrintWriter("c:eports\dataOut.txt")

Question 8

When you start a Java program from a command line and supply argument values, the values ____.

Accepted Answer

A) are stored as float values 
B) are stored as int values 
C) are stored as String values 
D) are stored as the type of value indicated by the argument 
A) are stored as float values 
B) are stored as int values 
C) are stored as String values 
D) are stored as the type of value indicated by the argument

Question 9

Consider the following code snippet:   If the input file contains the characters 626.14 average, what values will number and result have after this code is executed?

Accepted Answer

A) number will contain the value 0 and result will contain the value 626.14. 
B) number will contain the value 626.14 and result will contain the value average. 
C) number will contain the value 626 and result will contain the value 14. 
D) number will contain the value 0 and result will contain the value average. 
A) number will contain the value 0 and result will contain the value 626.14. 
B) number will contain the value 626.14 and result will contain the value average. 
C) number will contain the value 626 and result will contain the value 14. 
D) number will contain the value 0 and result will contain the value average.

Question 10

Consider the following code snippet:   If the file cannot be located, which of the following statements about this code is correct?

Accepted Answer

A) It cannot be determined how the method must handle the exception if the file cannot be located. 
B) This method must handle the exception in the body of the method. 
C) This method will be terminated if the file cannot be located. 
D) This method must use a throw statement to pass the error back to its caller. 
A) It cannot be determined how the method must handle the exception if the file cannot be located. 
B) This method must handle the exception in the body of the method. 
C) This method will be terminated if the file cannot be located. 
D) This method must use a throw statement to pass the error back to its caller.

Question 11

You wish to use the Scanner class's nextInt() method to read in whole numbers.To avoid exceptions that would occur if the input is not a whole number, you should use the ____ method before calling nextInt().

Accepted Answer

A) hasNextInteger() 
B) hasNext() 
C) hasNextInt() 
D) hasIntegerValue() 
A) hasNextInteger() 
B) hasNext() 
C) hasNextInt() 
D) hasIntegerValue()

Question 12

Consider the following code snippet:   If the input file begins with the characters 626.14 average, what values will number and result have after this code is executed?

Accepted Answer

A) number will contain the value 0 and result will contain the value average. 
B) number will contain the value 626.14 and result will contain the value average. 
C) number will contain the value 626 and result will contain the value 14. 
D) number will contain the value 0 and result will contain the value 626.14. 
A) number will contain the value 0 and result will contain the value average. 
B) number will contain the value 626.14 and result will contain the value average. 
C) number will contain the value 626 and result will contain the value 14. 
D) number will contain the value 0 and result will contain the value 626.14.

Question 13

Which expression converts the string input containing floating-point digits to its floating-point value?

Accepted Answer

A) input.parseFloat() 
B) input.parseDouble() 
C) Double.parseDouble(input) 
D) Float.parseFloat(input) 
A) input.parseFloat() 
B) input.parseDouble() 
C) Double.parseDouble(input) 
D) Float.parseFloat(input)

Question 14

Which of the following statements about exception reporting is true?

Accepted Answer

A) Use the throw statement to report that an exception has occurred. 
B) Use the reportError statement to report that an exception has occurred. 
C) Use the reportException statement to report that an exception has occurred. 
D) Use the throwException statement to report that an exception has occurred. 
A) Use the throw statement to report that an exception has occurred. 
B) Use the reportError statement to report that an exception has occurred. 
C) Use the reportException statement to report that an exception has occurred. 
D) Use the throwException statement to report that an exception has occurred.

Question 15

If the current method in a program will not be able to handle an exception, what should be coded into the method?

Accepted Answer

A) The method should include a try/catch block for all possible exceptions. 
B) The method declaration should be enclosed in a try/catch block. 
C) The throws clause should list the name of the method to which the exception should be passed. 
D) The throws clause should list the names of all exceptions that the method will not handle. 
A) The method should include a try/catch block for all possible exceptions. 
B) The method declaration should be enclosed in a try/catch block. 
C) The throws clause should list the name of the method to which the exception should be passed. 
D) The throws clause should list the names of all exceptions that the method will not handle.

Question 16

Which statement about handling exceptions is true?

Accepted Answer

A) If an exception has no handler, the program will be terminated. 
B) If an exception has no handler, the error will be ignored. 
C) Statements to handle exceptions should be placed inside a try clause. 
D) Statements that may cause exceptions should be placed inside a catch clause. 
A) If an exception has no handler, the program will be terminated. 
B) If an exception has no handler, the error will be ignored. 
C) Statements to handle exceptions should be placed inside a try clause. 
D) Statements that may cause exceptions should be placed inside a catch clause.

Question 17

Consider the following code snippet:
throw new IllegalArgumentException("This operation is not allowed!");
Which of the following statements about this code is correct?

Accepted Answer

A) This code throws an existing IllegalArgumentException object. 
B) This code will not compile. 
C) This code constructs an object of type IllegalArgumentException and throws the object. 
D) This code constructs an object of type IllegalArgumentException and reserves it for future use. 
A) This code throws an existing IllegalArgumentException object. 
B) This code will not compile. 
C) This code constructs an object of type IllegalArgumentException and throws the object. 
D) This code constructs an object of type IllegalArgumentException and reserves it for future use.

Question 18

When reading words using a Scanner object's next method, ____.

Accepted Answer

A) the program must discard white space characters at the beginning of the input before calling the next method 
B) any characters that are considered to be white space within the word become part of the word 
C) any characters at the beginning of the input that are considered to be white space are consumed and become part of the word being read 
D) any characters at the beginning of the input that are considered to be white space are consumed and do not become part of the word being read 
A) the program must discard white space characters at the beginning of the input before calling the next method 
B) any characters that are considered to be white space within the word become part of the word 
C) any characters at the beginning of the input that are considered to be white space are consumed and become part of the word being read 
D) any characters at the beginning of the input that are considered to be white space are consumed and do not become part of the word being read

Question 19

Which of the following statements about reading web pages is true?

Accepted Answer

A) A Scanner object cannot be used to read a web page. 
B) You must create a URL object to use with a Scanner object to read a web page. 
C) You must use the openStream() method of a Scanner object to read a web page. 
D) You must create a File object to use with a Scanner object to read a web page. 
A) A Scanner object cannot be used to read a web page. 
B) You must create a URL object to use with a Scanner object to read a web page. 
C) You must use the openStream() method of a Scanner object to read a web page. 
D) You must create a File object to use with a Scanner object to read a web page.

Question 20

Which of the following statements about reading and writing text files is correct?

Accepted Answer

A) You use the Scanner class to read text files and the PrintWriter class to write text files. 
B) You use the Scanner class to write text files and the PrintWriter class to read text files. 
C) You use the Scanner class to read and write text files. 
D) You use the PrintWriter class to read and write text files. 
A) You use the Scanner class to read text files and the PrintWriter class to write text files. 
B) You use the Scanner class to write text files and the PrintWriter class to read text files. 
C) You use the Scanner class to read and write text files. 
D) You use the PrintWriter class to read and write text files.

Exam 11: Input/Output and Exception Handling

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

Select an expression to complete the program segment below, which is designed to read data from a file whose name is specified as the first command line argument.If no command line arguments are given, the program reads data from the default.txt file.

Which of the following is the correct syntax for starting a Java program named myProg from a command line if the program requires two arguments named arg1 and arg2 to be supplied?

Which of the following statements about using the PrintWriter object is correct?

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

Insert the missing code in the following code fragment.This fragment is intended to write an output file named dataOut.txt that resides in a folder named reports on the C: drive of a Windows system.

When you start a Java program from a command line and supply argument values, the values ____.

Consider the following code snippet: If the input file contains the characters 626.14 average, what values will number and result have after this code is executed?

Consider the following code snippet: If the file cannot be located, which of the following statements about this code is correct?

You wish to use the Scanner class's nextInt() method to read in whole numbers.To avoid exceptions that would occur if the input is not a whole number, you should use the ____ method before calling nextInt().

Consider the following code snippet: If the input file begins with the characters 626.14 average, what values will number and result have after this code is executed?

Which expression converts the string input containing floating-point digits to its floating-point value?

Which of the following statements about exception reporting is true?

If the current method in a program will not be able to handle an exception, what should be coded into the method?

Which statement about handling exceptions is true?

Consider the following code snippet: throw new IllegalArgumentException("This operation is not allowed!"); Which of the following statements about this code is correct?

When reading words using a Scanner object's next method, ____.

Which of the following statements about reading web pages is true?

Which of the following statements about reading and writing text files 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

Filters