One-liner to count number of occurrences of String in a String[] in Java?

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走了就别回头了
走了就别回头了 2021-02-19 03:59

I have an array of String:

String[] myArray = {\"A\", \"B\", \"B\", \"C\"};

Is there a quick way to count the number of occurrence

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  •  予麋鹿
    予麋鹿 (楼主)
    2021-02-19 04:52

    You can also try using Guava which is full of useful utilities. Using below code, you can count the frequency via Multiset:

    public static void main(final String[] args) {
            String[] myArray = {"A", "B", "B", "C"};
            Multiset wordsMultiset = HashMultiset.create();
            wordsMultiset.addAll(new ArrayList(Arrays.asList(myArray)));
            int counts=wordsMultiset.count("B");
            System.out.println(counts);
        }
    

    Although I know that you are looking for a single liner, but Guava is full of many more utils which are not possible with routine java utils.

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