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,

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

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

◀ Previous Next ▶