import java.util.regex.Pattern;

public class ValidasiEmail {
    public static void main(String[] args) {
        Pattern pola = Pattern.compile("^[\\w.]+@[\\w.]+\\.[a-zA-Z]{2,}$");

        String[] kandidat = {
            "budi@example.com",
            "siti.kedua@example.co.id",
            "budi@contoh",
            "budi.example.com",
            "budi@@example.com"
        };

        for (String email : kandidat) {
            System.out.println(email + " -> " + pola.matcher(email).matches());
        }
    }
}