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

Question

I have an array of String:

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

Is there a quick way to count the number of occurrence

Answer 1

You can use the frequency method:

List list = Arrays.asList(myArray);
int count = Collections.frequency(list, "B");

or in one line:

int count = Collections.frequency(Arrays.asList(myArray), "B");

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With Java 8 you can also write:

long count = Arrays.stream(myArray).filter(s -> "B".equals(s)).count();

Or with a method reference:

long count = Arrays.stream(myArray).filter("B"::equals).count();