OnJava8-Examples/streams/TreeSetOfWords.java at master · allwrongabc/OnJava8-Examples

31 lines (30 loc) · 1.04 KB

// streams/TreeSetOfWords.java

// 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]

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