Example: CharacterFrequencyArray in Java

// CharacterFrequencyArray
import java.util.Scanner;

// Main class containing the entry point of the program
public class Main {
    public static void main(String[] args) {
        String str = "programming";
        // Assuming ASCII characters (0-255).
        // For only lowercase English letters, a smaller array of size 26 could be used:
        // int[] charFrequencies = new int[26]; and index would be c - 'a';
        int[] charFrequencies = new int[256];

        // Step 1: Iterate through each character of the string
        for (int i = 0; i < str.length(); i++) {
            char c = str.charAt(i);
            // Step 2: Use the character's ASCII value as an index to increment its count
            charFrequencies[c]++;
        }

        // Step 3: Print the character frequencies
        System.out.println("Character frequencies (Array):");
        for (int i = 0; i < charFrequencies.length; i++) {
            if (charFrequencies[i] > 0) {
                // Cast the index back to char to print the character
                System.out.println((char) i + ": " + charFrequencies[i]);
            }
        }
    }
}