Text file into Java Set using Commons or Guava

Question

I would like to load each line in a file into HashSet collection. Is there a simple way to do this?

Answer 1

How about:

Sets.newHashSet(Files.readLines(file, charSet));

(using Guava).

References:

• Files.readLines()
• Sets.newHashSet()

Answer 2

You can do

Set<String> lines = new HashSet<String>(FileUtils.readLines(new File("foo.txt")));

Using the Apache Commons FileUtils class and the readlines method.

Answer 3

Multiset can store duplicated strings, if your text contains duplicated lines. (add ordering)

Multiset<String> set = LinkedHashMultiset.create();

Answer 4

With Apache Commons IO you have readLines which returns a List. You can then add all elements from the returned list into your HashSet (beware: type compatibility between List and Set, and loosing duplicated lines).