Find the most common String in ArrayList()

Question

Is there a way to find the most common String in an ArrayList?

ArrayList<String> list = new ArrayList<>();
list.add("test");
list.add("test");
list.add("hello");
list.add("test");

Should find the word "test" from this list ["test","test","hello","test"]

Answer 1

In statistics, this is called the "mode". A vanilla Java 8 solution looks like this:

Stream.of("test","test","hello","test")
      .collect(Collectors.groupingBy(s -> s, Collectors.counting()))
      .entrySet()
      .stream()
      .max(Comparator.comparing(Entry::getValue))
      .ifPresent(System.out::println);

Which yields:

test=3

jOOλ is a library that supports mode() on streams. The following program:

System.out.println(
    Seq.of("test","test","hello","test")
       .mode()
);

Yields:

Optional[test]

(disclaimer: I work for the company behind jOOλ)

Answer 2

As per question, Specifically just to get word, not the number of times (i.e. value of key).

String mostRepeatedWord 
    = list.stream()
          .collect(Collectors.groupingBy(w -> w, Collectors.counting()))
          .entrySet()
          .stream()
          .max(Comparator.comparing(Entry::getValue))
          .get()
          .getKey();