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import java.util.Scanner; public class EmailValidator { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System.out.print("Enter an email address: "); String email = scanner.nextLine(); if (validateEmail(email)) { System.out.println("Email address is valid."); } else { System.out.println("Email address is invalid."); } scanner.close(); } public static boolean validateEmail(String email) { // Check for exactly one "@" symbol if (email.chars().filter(ch -> ch == '@').count() != 1) { return false; } String[] parts = email.split("@"); String localPart = parts[0]; String domainPart = parts[1]; // Check local part if (!localPart.matches("[a-zA-Z0-9._]+")) { return false; } // Check domain part if (!domainPart.matches("[a-zA-Z0-9]+(\\.[a-zA-Z0-9]+)+")) { return false; } // Check for dot at the beginning or end if (email.startsWith(".") || email.endsWith(".")) { return false; } return true; } }