Chapter 12, Problem 12.22PE

Program Plan Intro

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Program plan:

• Import the required packages into the program.
• Create a class Exercise12_22 to replace the text of all the files located in a specific directory.
  • Declare the required variables.
  • Get the file input path from the user as the command line arguments.
  • In the main() method.
    • Check command line parameter is valid or not.
    • Check the input path is a directory or not.
      • If it is not a directory, then display the error message.
      • If it is a directory, then list the file content of the directory.
      • The directory contents are files, then invoke the method replaceInAFile() to replace the file old string with new string.
  • The method replaceInAFile() is used with the try{}..catch() block for exception handling.
    • This method replaces all the files in old string with a new string located in a directory.