Ordering results from Collections.frequency

Question

I have got an ArrayList with 500+ words in. I'm trying to organise them into a list where the word that appears the most is at the top and then the 2nd most frequent and so on.

So far I've managed to filter out words with a frequency of less than 5 with the code below however I cannot work out how I can organise these results into a list of their frequencies in descending order.

    Set<String> unique = new HashSet<String>(wordsL);

    for (String key : unique) {
      if (Collections.frequency(wordsL, key) > 5) {
//        println(Collections.frequency(wordsL, key));
        lwords.add(key);
        println(lwords);
      }
    }

Thanks in advance for any help.

Why not using `Map` for counting. This can be [sorted by value](http://stackoverflow.com/questions/109383/how-to-sort-a-mapkey-value-on-the-values-in-java) later. — BobTheBuilder, Apr 25 '13 at 11:16

score 1 · Accepted Answer · edited May 23 '17 at 10:25

1

You can use Map<String, Integer> for counting.

You can later sort the map by value.

edited May 23 '17 at 10:25

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answered Apr 25 '13 at 11:19

BobTheBuilder

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Thanks for this, I'm new to this and I am unfamiliar with maps, great help! – John Smith Apr 25 '13 at 11:21

Ordering results from Collections.frequency

1 Answers1