Question

In JAVA

Develop a class definition for a Person. Then develop a class definition for a Military Person that

inherits the properties of the Person, and a Navy Sailor that inherits the properties of a Military

Person. Finally, create two classes; an Officer and an Enlisted that each can inherit the properties of

a Navy Sailor. At each level, include the following class variables:

Person: FirstName, MiddleInitial, LastName, Gender

*

Military Person: Active Duty or Reserve

*

Navy Sailor: Base where stationed, Surface Ship or Submarine, Date Commissioned, Rank

Include a toString() method in each class that will print out what type of class it is. Include methods

read each of the class variables (i.e., getRank()) and methods to change the value of each class

variable. Finally, develop methods so that all of the information in an object can be printed out.

Write a short main() program to test it out.

Important Note: Be sure to incorporate the principles of encapsulation (Chapter 8) in your

definitions.

Answer 1

Please find the required program along with its output. Please see the comments against each line to understand the step.

class Test {

    public static void main(String[] args) {

        Person person = new Person("person"," ","one","male");  //create a person object
        MilitaryPerson militaryPerson = new MilitaryPerson("person"," ","two","male",true); //create a MilitaryPerson object
        NavySailor navySailor = new NavySailor("person"," ","three","male",true,"StationOne","Submarine","12-07-2016","captain");   //create a NavySailor object

        System.out.println(person); //print all objects, this will internally invoke each class's toString() method
        System.out.println(militaryPerson);
        System.out.println(navySailor);
    }
}

class Person{

    String FirstName;
    String MiddleInitial;
    String LastName;
    String Gender;

    public Person(String firstName, String middleInitial, String lastName, String gender) { //constructor
        FirstName = firstName;
        MiddleInitial = middleInitial;
        LastName = lastName;
        Gender = gender;
    }

    public String getFirstName() {
        return FirstName;
    }

    public void setFirstName(String firstName) {
        FirstName = firstName;
    }

    public String getMiddleInitial() {
        return MiddleInitial;
    }

    public void setMiddleInitial(String middleInitial) {
        MiddleInitial = middleInitial;
    }

    public String getLastName() {
        return LastName;
    }

    public void setLastName(String lastName) {
        LastName = lastName;
    }

    public String getGender() {
        return Gender;
    }

    public void setGender(String gender) {
        Gender = gender;
    }

    @Override
    public String toString() {
        return "Person{" +
                "FirstName='" + FirstName + '\'' +
                ", MiddleInitial='" + MiddleInitial + '\'' +
                ", LastName='" + LastName + '\'' +
                ", Gender='" + Gender + '\'' +
                '}';
    }
}

class MilitaryPerson extends Person {   //constructor

    boolean activeDutyOrReserve;

    public MilitaryPerson(String firstName, String middleInitial, String lastName, String gender, boolean activeDutyOrReserve) {
        super(firstName, middleInitial, lastName, gender);
        this.activeDutyOrReserve = activeDutyOrReserve;
    }

    public boolean isActiveDutyOrReserve() {
        return activeDutyOrReserve;
    }

    public void setActiveDutyOrReserve(boolean activeDutyOrReserve) {
        this.activeDutyOrReserve = activeDutyOrReserve;
    }
}

class NavySailor extends MilitaryPerson {   //constructor

    String Base;
    String ShipType;
    String CommissionedDate;
    String Rank;

    public NavySailor(String firstName, String middleInitial, String lastName, String gender, boolean activeDutyOrReserve, String base, String shipType, String commissionedDate, String rank) {
        super(firstName, middleInitial, lastName, gender, activeDutyOrReserve);
        Base = base;
        ShipType = shipType;
        CommissionedDate = commissionedDate;
        Rank = rank;
    }

    public String getBase() {
        return Base;
    }

    public void setBase(String base) {
        Base = base;
    }

    public String getShipType() {
        return ShipType;
    }

    public void setShipType(String shipType) {
        ShipType = shipType;
    }

    public String getCommissionedDate() {
        return CommissionedDate;
    }

    public void setCommissionedDate(String commissionedDate) {
        CommissionedDate = commissionedDate;
    }

    public String getRank() {
        return Rank;
    }

    public void setRank(String rank) {
        Rank = rank;
    }

    @Override
    public String toString() {
        return "NavySailor{" +
                "Base='" + Base + '\'' +
                ", ShipType='" + ShipType + '\'' +
                ", CommissionedDate='" + CommissionedDate + '\'' +
                ", Rank='" + Rank + '\'' +
                "} " + super.toString();
    }
}

class Officer extends NavySailor{
    public Officer(String firstName, String middleInitial, String lastName, String gender, boolean activeDutyOrReserve, String base, String shipType, String commissionedDate, String rank) {
        super(firstName, middleInitial, lastName, gender, activeDutyOrReserve, base, shipType, commissionedDate, rank);
    }

    @Override
    public String toString() {
        return "Officer{} " + super.toString();
    }
}

class Enlisted extends NavySailor{

    public Enlisted(String firstName, String middleInitial, String lastName, String gender, boolean activeDutyOrReserve, String base, String shipType, String commissionedDate, String rank) {
        super(firstName, middleInitial, lastName, gender, activeDutyOrReserve, base, shipType, commissionedDate, rank);
    }

    @Override
    public String toString() {
        return "Enlisted{} " + super.toString();
    }
}

--------------------------------------

OUTPUT:

Person{FirstName='person', MiddleInitial=' ', LastName='one', Gender='male'}
Person{FirstName='person', MiddleInitial=' ', LastName='two', Gender='male'}
NavySailor{Base='StationOne', ShipType='Submarine', CommissionedDate='12-07-2016', Rank='captain'} Person{FirstName='person', MiddleInitial=' ', LastName='three', Gender='male'}