Java Program To Remove Characters In A String Except Alphabets

Understanding the Problem

Here's a sample Java program that demonstrates how to remove characters in a string except for alphabets: public class Main { public static void main(String[] args) { String input = "Hello, World! 123"; String output = input.replaceAll("[^a-zA-Z]", ""); System.out.println(output); } }. This program uses the replaceAll() method, which replaces each substring of the input string that matches the given regular expression with the specified replacement string. In this case, the regular expression [^a-zA-Z] matches any character that is not a letter (either uppercase or lowercase), and the replacement string is an empty string, effectively removing these characters.