Example: CharacterFrequencyStreams in Java

// CharacterFrequencyStreams
import java.util.Map;
import java.util.function.Function;
import java.util.stream.Collectors;

// Main class containing the entry point of the program
public class Main {
    public static void main(String[] args) {
        String inputString = "programming";

        // Step 1: Convert the string to an IntStream of character codes
        Map<Character, Long> charFrequencies = inputString.chars()
            // Step 2: Map each int character code back to a Character object
            .mapToObj(c -> (char) c)
            // Step 3: Collect the characters, grouping them by identity and counting occurrences
            .collect(Collectors.groupingBy(Function.identity(), Collectors.counting()));

        // Step 4: Print the character frequencies
        System.out.println("Character frequencies (Java 8 Streams Method):");
        charFrequencies.forEach((key, value) -> System.out.println(key + ": " + value));
    }
}