Given a String, find the first repeated character in it using Stream functions?

This program finds the first repeated character in a String using Java Stream functions. It groups characters by occurrence count with Collectors.groupingBy() using a LinkedHashMap (to preserve order), then filters for the first character whose count is greater than 1.

Code Example:

import java.util.*;
import java.util.stream.*;
import java.util.function.Function;

public class FirstRepeated {

    public static void main(String args[]) {

        String input = "Java Articles are Awesome";

        Character result = input.chars()
                .mapToObj(s -> Character.toLowerCase(Character.valueOf((char) s)))
                .collect(Collectors.groupingBy(
                        Function.identity(),
                        LinkedHashMap::new,
                        Collectors.counting()))
                .entrySet().stream()
                .filter(entry -> entry.getValue() > 1L)
                .map(entry -> entry.getKey())
                .findFirst()
                .get();

        System.out.println(result);
    }
}

Output:

a