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Java - count number of element occurrences in ArrayList
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In this article, we would like to show you how to count the number of element occurrences in Arraylist in Java.
Quick solution:
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int occurrences = Collections.frequency(myArrayList, element);
In this example, we use Collections.frequency() method to count the number of A elements in letters ArrayList.
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import java.util.*;2
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public class Example {4
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public static void main(String[] args) {6
List<String> letters = new ArrayList<>();7
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letters.add("A");9
letters.add("A");10
letters.add("A");11
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int occurrencesA = Collections.frequency(letters, "A");13
System.out.println("number of A element occurrences: " + occurrencesA);14
}15
}Output:
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number of A element occurrences: 3