public abstract class Person {

String firstName;

String lastName;

String ID;

Phone phoneNumber;

public Person() {

firstName = "";

lastName = new String();

ID = "";

phoneNumber = new Phone();

}

public Person(String fN, String lN, String id, Phone pN){

firstName = fN;

lastName = lN;

ID = id;

phoneNumber = pN;

}

public String getFirstName(){

return firstName;

}

public String getLastName(){

return lastName;

}

public String getID(){

return ID;

}

public void setFirstName(String fN){

firstName = fN;

}

public void setLastName(String lN){

lastName = lN;

}

public void setID(String id){

ID = id;

}

public abstract void display();

}