Example: Remove Non-Alphabets by Iteration in Java

// Remove Non-Alphabets by Iteration
public class Main {
    public static void main(String[] args) {
        // Step 1: Define the input string
        String originalString = "Learn Java @ CodeAcademy!";
        System.out.println("Original String: " + originalString);

        // Step 2: Create a StringBuilder to efficiently build the new string
        StringBuilder cleanedStringBuilder = new StringBuilder();

        // Step 3: Iterate through each character of the original string
        for (char c : originalString.toCharArray()) {
            // Step 4: Check if the character is a letter
            if (Character.isLetter(c)) {
                // Step 5: Append the letter to the StringBuilder
                cleanedStringBuilder.append(c);
            }
        }

        // Step 6: Convert the StringBuilder content back to a String
        String cleanedString = cleanedStringBuilder.toString();

        // Step 7: Print the cleaned string
        System.out.println("Cleaned String: " + cleanedString);
    }
}