Chapter 12, Problem 12.18PE

Program Plan Intro

Add package statement

Program plan:

• Import the required packages into the program.
• Declare the required variables.
• Get the file input path from the user as the command line arguments.
• Use the try{}..catch() block for exception handling.
• Check the input argument value is valid or not.
  • Check the input argument path exists 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.
      • If the file contents are directory, then get the directory name starting with “chapter” and prepare a insert package statement.
      • Call the “insertIntoFilesInDirectory()” method to insert the package statement.
• The “insertIntoFilesInDirectory()” method lists the files available in each directory.
  • This method gets the files name that end with “.java”.
  • This method calls the “insertPackageStatment()” method to insert the package name in each file ending with the name “.java”.
• The “insertPackageStatment()” method reads each file that ends with the name “.java” and appends the package name as “package chapteri;”at the beginning of each file.