Method main

collections/UniqueWords.java:9–19

(String[] args)

public class UniqueWords {
  public static void
  main(String[] args) throws Exception {
    List<String> lines = Files.readAllLines(
      Paths.get("SetOperations.java"));
    Set<String> words = new TreeSet<>();
    for(String line : lines)
      for(String word : line.split("\\W+"))
        if(word.trim().length() > 0)
          words.add(word);
    System.out.println(words);
  }
}
/* Output:
[A, B, C, Collections, D, E, F, G, H, HashSet, I, J, K,