import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class Person {

    private final List<String> emails;

    public Person(List<String> emails) {
        this.emails = new ArrayList<>(emails);
    }

    public void printEmails() {
    	System.out.println(emails);
    }

    public static void main(String args[]) {
        List<String> emails = new ArrayList<>(Arrays.asList("a@gmail.com", "b@gmail.com"));
        Person person = new Person(emails);
        person.printEmails();
        emails.add("newEmail@gmail.com");
        person.printEmails();
    }
}