Deleting duplicate lines in a file using Java

Question

As part of a project I\'m working on, I\'d like to clean up a file I generate of duplicate line entries. These duplicates often won\'t occur near each other, however. I came

Answer 1

You could use Set in the Collections library to store unique, seen values as you read the file.

Set uniqueStrings = new HashSet();

// read your file, looping on newline, putting each line into variable 'thisLine'

    uniqueStrings.add(thisLine);

// finish read

for (String uniqueString:uniqueStrings) {
  // do your processing for each unique String
  // i.e. System.out.println(uniqueString);
}