Chapter 21, Problem 5PE

Program Plan Intro

To use temporary file to reverse all lines in a file

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 the input file stream to get the bytes from an input file.
    • Get the input bytes form the file.
    • Call the method “readAllLines()” to read all the lines from the input file.
    • Create a temporary file stream.
    • Create a temporary file.
    • Get the file name.
    • Create an input file stream.
    • Create a loop,
      • Create an inner loop,
        • Call the method “write()” to write the content into temporary file.
        • • Call the method “write()” to write new line in the temporary file.
    • Close the temporary file stream.
    • Get the path of original file.
    • Get the path of temporary file.
    • Delete the original file.
    • Get the original file.
    • Call the method “move()” to move the temporary file into its original file.