Person.java

/**
 * The class Person contains some information about a person.
 * It does not depend on other classes.
 */

// added interface and implementing it here
public class Person implements PersonInterface {
    private String firstName, lastName, emailAddress, phoneNumber;

    @Override
    public String getFirstName() {
        return firstName;
    }

    @Override
    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    @Override
    public String getLastName() {
        return lastName;
    }

    @Override
    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    @Override
    public String getEmailAddress() {
        return emailAddress;
    }

    @Override
    public void setEmailAddress(String emailAddress) {
        this.emailAddress = emailAddress;
    }

    @Override
    public String getPhoneNumber() {
        return phoneNumber;
    }

    @Override
    public void setPhoneNumber(String phoneNumber) {
        this.phoneNumber = phoneNumber;
    }
}