Count occurrence of a given character in a string using Stream API in Java

Given a string and a character, the task is to make a function which counts the occurrence of the given character in the string using Stream API.

Examples:

Input: str = "geeksforgeeks", c = 'e'
Output: 4
'e' appears four times in str.

Input: str = "abccdefgaa", c = 'a' 
Output: 3
'a' appears three times in str.

Approach:



  • Convert the string into character stream
  • Check if the character in the stream is the character to be counted using filter() function.
  • Count the matched characters using the count() function

Below is the implementation of the above approach:

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java program to count occurrences
// of a character using Stream
  
import java.util.stream.*;
  
class GFG {
  
    // Method that returns the count of the given
    // character in the string
    public static long count(String s, char ch)
    {
  
        return s.chars()
            .filter(c -> c == ch)
            .count();
    }
  
    // Driver method
    public static void main(String args[])
    {
        String str = "geeksforgeeks";
        char c = 'e';
        System.out.println(count(str, c));
    }
}

chevron_right


Output:

4

Related Article: Program to count occurrence of a given character in a string



My Personal Notes arrow_drop_up

Check out this Author's contributed articles.

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.




Article Tags :
Practice Tags :


Be the First to upvote.


Please write to us at contribute@geeksforgeeks.org to report any issue with the above content.