How to count the Number of Occurrences of Specific Element in the List in Java - Step by Step Examples

How to count the Number of Occurrences of Specific Element in the List in Java ?

Answer

To count the number of occurrences of a specific element in a list in Java, you can use a loop to iterate through the list and increment a counter variable when the element matches the desired one.


✐ Examples

1 Count Occurrences of Element in List

In this example,

  1. We create an ArrayList named numbers containing integer elements.
  2. We use a for-each loop to iterate through the list and increment a counter when the element matches the desired one.
  3. After looping, the counter variable holds the count of occurrences.
  4. Finally, we print the count to the console.

Java Program

import java.util.ArrayList;

public class Main {
    public static void main(String[] args) {
        ArrayList<Integer> numbers = new ArrayList<>();
        numbers.add(1);
        numbers.add(2);
        numbers.add(3);
        numbers.add(4);
        numbers.add(1);
        numbers.add(2);
        numbers.add(1);
        int count = 0;
        for (int num : numbers) {
            if (num == 1) {
                count++;
            }
        }
        System.out.println("Count of 1 is: " + count);
    }
}

Output

Count of 1 is: 3

2 Count Occurrences of String in List

In this example,

  1. We create an ArrayList named words containing string elements.
  2. We use a for-each loop to iterate through the list and increment a counter when the string matches the desired one.
  3. After looping, the counter variable holds the count of occurrences.
  4. Finally, we print the count to the console.

Java Program

import java.util.ArrayList;

public class Main {
    public static void main(String[] args) {
        ArrayList<String> words = new ArrayList<>();
        words.add("apple");
        words.add("banana");
        words.add("apple");
        words.add("cherry");
        int count = 0;
        for (String word : words) {
            if (word.equals("apple")) {
                count++;
            }
        }
        System.out.println("Count of 'apple' is: " + count);
    }
}

Output

Count of 'apple' is: 2

Summary

In this tutorial, we learned How to count the Number of Occurrences of Specific Element in the List in Java language with well detailed examples.


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