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:
// 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)); } } |
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filter_none
Output:
4
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