Text file into Java Set<String> using Commons or Guava

问题

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

回答1:

How about:

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

(using Guava).

References:

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

回答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.

回答3:

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

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

回答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).

来源：https://stackoverflow.com/questions/5804269/text-file-into-java-setstring-using-commons-or-guava