Writing in the beginning of a text file Java

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You can’t really modify it that way – file systems don’t generally let you insert data in arbitrary locations – but you can:

  • Create a new file
  • Write the prefix to it
  • Copy the data from the old file to the new file
  • Move the old file to a backup location
  • Move the new file to the old file’s location
  • Optionally delete the old backup file

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