Random access file to reverse all lines of a file in place Program plan: Import necessary packages. Create a class “LinesReverserTest”, Define the “main()” method. Execute “try” statement, Create a “Scanner” object. Prompt the user to enter the name of file. Get the name of file from the user. Call the method “reverseLines()”. Catch if exception occurs, Print the exception. Define the method “reverseLines()”, Create random access file. Initialize the variable. Declare the variable for the position. Execute a loop, Get the file pointer. Call the “seek()” method. Create a loop, Write the reversed line into the output. Call the method to print new line character into the output file. Close the file stream.

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Answer 1

Question

Chapter 20, Problem 4PE

Program Plan Intro

Random access file to reverse all lines of a file in place

Program plan:

Import necessary packages.

Create a class “LinesReverserTest”,

Define the “main()” method.

Execute “try” statement,

Create a “Scanner” object.

Prompt the user to enter the name of file.

Get the name of file from the user.

Call the method “reverseLines()”.

Catch if exception occurs,

Print the exception.

Define the method “reverseLines()”,

Create random access file.

Initialize the variable.

Declare the variable for the position.

Execute a loop,

Get the file pointer.

Call the “seek()” method.

Create a loop,

Write the reversed line into the output.

Call the method to print new line character into the output file.

Close the file stream.

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Answer 2

Question

Chapter 20, Problem 4PE

Program Plan Intro

Random access file to reverse all lines of a file in place

Program plan:

Import necessary packages.

Create a class “LinesReverserTest”,

Define the “main()” method.

Execute “try” statement,

Create a “Scanner” object.

Prompt the user to enter the name of file.

Get the name of file from the user.

Call the method “reverseLines()”.

Catch if exception occurs,

Print the exception.

Define the method “reverseLines()”,

Create random access file.

Initialize the variable.

Declare the variable for the position.

Execute a loop,

Get the file pointer.

Call the “seek()” method.

Create a loop,

Write the reversed line into the output.

Call the method to print new line character into the output file.

Close the file stream.

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Answer 3

Question

Chapter 20, Problem 4PE

Program Plan Intro

Random access file to reverse all lines of a file in place

Program plan:

Import necessary packages.

Create a class “LinesReverserTest”,

Define the “main()” method.

Execute “try” statement,

Create a “Scanner” object.

Prompt the user to enter the name of file.

Get the name of file from the user.

Call the method “reverseLines()”.

Catch if exception occurs,

Print the exception.

Define the method “reverseLines()”,

Create random access file.

Initialize the variable.

Declare the variable for the position.

Execute a loop,

Get the file pointer.

Call the “seek()” method.

Create a loop,

Write the reversed line into the output.

Call the method to print new line character into the output file.

Close the file stream.

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Answer 4

Question

Chapter 20, Problem 4PE

Program Plan Intro

Random access file to reverse all lines of a file in place

Program plan:

Import necessary packages.

Create a class “LinesReverserTest”,

Define the “main()” method.

Execute “try” statement,

Create a “Scanner” object.

Prompt the user to enter the name of file.

Get the name of file from the user.

Call the method “reverseLines()”.

Catch if exception occurs,

Print the exception.

Define the method “reverseLines()”,

Create random access file.

Initialize the variable.

Declare the variable for the position.

Execute a loop,

Get the file pointer.

Call the “seek()” method.

Create a loop,

Write the reversed line into the output.

Call the method to print new line character into the output file.

Close the file stream.

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Answer 5

Chapter 20, Problem 4PE

Program Plan Intro

Random access file to reverse all lines of a file in place

Program plan:

Import necessary packages.

Create a class “LinesReverserTest”,

Define the “main()” method.

Execute “try” statement,

Create a “Scanner” object.

Prompt the user to enter the name of file.

Get the name of file from the user.

Call the method “reverseLines()”.

Catch if exception occurs,

Print the exception.

Define the method “reverseLines()”,

Create random access file.

Initialize the variable.

Declare the variable for the position.

Execute a loop,

Get the file pointer.

Call the “seek()” method.

Create a loop,

Write the reversed line into the output.

Call the method to print new line character into the output file.

Close the file stream.

Answer 6

Chapter 20, Problem 4PE

Program Plan Intro

Random access file to reverse all lines of a file in place

Program plan:

Import necessary packages.

Create a class “LinesReverserTest”,

Define the “main()” method.

Execute “try” statement,

Create a “Scanner” object.

Prompt the user to enter the name of file.

Get the name of file from the user.

Call the method “reverseLines()”.

Catch if exception occurs,

Print the exception.

Define the method “reverseLines()”,

Create random access file.

Initialize the variable.

Declare the variable for the position.

Execute a loop,

Get the file pointer.

Call the “seek()” method.

Create a loop,

Write the reversed line into the output.

Call the method to print new line character into the output file.

Close the file stream.

Answer 7

Chapter 20, Problem 4PE

Program Plan Intro

Random access file to reverse all lines of a file in place

Program plan:

Import necessary packages.

Create a class “LinesReverserTest”,

Define the “main()” method.

Execute “try” statement,

Create a “Scanner” object.

Prompt the user to enter the name of file.

Get the name of file from the user.

Call the method “reverseLines()”.

Catch if exception occurs,

Print the exception.

Define the method “reverseLines()”,

Create random access file.

Initialize the variable.

Declare the variable for the position.

Execute a loop,

Get the file pointer.

Call the “seek()” method.

Create a loop,

Write the reversed line into the output.

Call the method to print new line character into the output file.

Close the file stream.

Answer 8

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Answer 9

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Answer 10

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Answer 11

Ch. 20.1 - Prob. 1SC Ch. 20.1 - Prob. 2SC Ch. 20.2 - Prob. 3SC Ch. 20.2 - Prob. 4SC Ch. 20.2 - Prob. 5SC Ch. 20.3 - Prob. 6SC Ch. 20.3 - Prob. 7SC Ch. 20.4 - Prob. 8SC Ch. 20.4 - Prob. 9SC Ch. 20.5 - Prob. 10SC

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Chapter 20 Solutions