// streams/TreeSetOfWords.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
import java.util.*;
import java.nio.file.*;
import java.util.stream.*;

public class TreeSetOfWords {
 public static void
 main(String[] args) throws Exception {
 Set<String> words2 =
 Files.lines(Paths.get("TreeSetOfWords.java"))
 .flatMap(s -> Arrays.stream(s.split("\\W+")))
 .filter(s -> !s.matches("\\d+")) // No numbers
 .map(String::trim)
 .filter(s -> s.length() > 2)
 .limit(100)
 .collect(Collectors.toCollection(TreeSet::new));
 System.out.println(words2);
 }
}
/* Output:
[Arrays, Collectors, Exception, Files, Output, Paths,
Set, String, System, TreeSet, TreeSetOfWords, args,
class, collect, file, filter, flatMap, get, import,
java, length, limit, lines, main, map, matches, new,
nio, numbers, out, println, public, split, static,
stream, streams, throws, toCollection, trim, util,
void, words2]
*/