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.   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 the variables of the class. Write a short main() program to test it out.

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

For each exercise, submit the source code and the screen output.

Answer 1

class Person
{
protected String FirstName, MiddleInitial, LastName, Gender;
public Person(String FirstName,String MiddleInitial,String LastName,String Gender)
{
this.FirstName=FirstName;
this.MiddleInitial=MiddleInitial;
this.LastName=LastName;
this.Gender=Gender;
}
public String toString()
{
return this.FirstName+" "+this.MiddleInitial+" "+this.LastName+" "+this.Gender;
}
}

class MilitaryPerson extends Person
{
boolean isActiveDuty;
public MilitaryPerson(String FirstName,String MiddleInitial,String LastName,String Gender,boolean isActiveDuty)
{
super(FirstName,MiddleInitial,LastName,Gender);
this.isActiveDuty=isActiveDuty;
}
public String toString()
{
return super.toString()+(this.isActiveDuty?" is active duty":"is reserve");
}
}
class NavySailor extends MilitaryPerson
{
String base,DateCommissioned;
boolean isSurface;
public NavySailor(String FirstName,String MiddleInitial,String LastName,String Gender,boolean isActiveDuty,String base,boolean isSurface,String DateCommissioned)
{
super(FirstName,MiddleInitial,LastName,Gender,isActiveDuty);
this.base=base;
this.isSurface=isSurface;
this.DateCommissioned=DateCommissioned;
}
public String toString()
{
return super.toString()+" based at "+this.base+(this.isSurface?" Surface Ship":" Submarine")+" commissioned on "+DateCommissioned;
}
  
}
public class Main
{
   public static void main(String[] args)
   {
       NavySailor n= new NavySailor("John","Arthur","Cotton","Male",true,"San Diego",true,"13 April 2009");
       System.out.println(n.toString());
   }
}