Chapter 7, Problem 10PE

Program Plan Intro

Reverse the file content

Program plan:

• Include the required header files in the program
• Define the “Reverse” class
  • Define the “readLinesToArray” method
    • Declare “lineList” as an “ArrayList” variable
    • In “try” block, declare an object for “Scanner” class and pass the filename as an argument.
      • Add the each lines to the “lineList” variable using “while” condition
    • The “catch” block throws an error message if the file is not found.
    • Return the value.
  • Define “reverse” method
    • Declare the string variable “reversed”
    • Iterate “i” until it reaches length of the “line” variable
      • Reverse each character in the file and store the reversed characters in “reversed” variable.
    • Return the “reversed” variable
  • Define “reverseAll” method
    • Iterate “i” until it reaches length of the “lineOfLines” variable
      • Call the “reverse” method and reverse each lines in the file
  • Define the “writeAll” method
    • In “try” block, declare an object for “PrintWriter” class and pass the filename as an argument.
    • Write all the lines in the file
    • The “catch” block throws an error message if the file is not found.
  • Define the main method
    • Check the “args” length is less than 1
    • If the condition is true, then display error message
    • Otherwise, create an object of “readLinesToArray” method
      • Call the “reverseAll” method with an argument
      • Call the “writeAll” with the arguments
      • Display the successive message.