Create an Alien class. Include at least three protected data members of your cho

Question

Create an Alien class. Include at least three protected data members of your
choice, such as the number of eyes the Alien has. Include a constructor that
requires a value for each data field and a toString() method that returns a
String containing a complete description of the Alien. Save the file as
Alien.java.
b. Create two classes—Martian and Jupiterian—that descend from Alien. Supply
each with a constructor that sets the Alien data fields with values you choose.
For example, you can decide that a Martian has four eyes but a Jupiterian has
only two. Save the files as Martian.java and Jupiterian.java.
c. Create an application that instantiates one Martian and one Jupiterian. Call the
toString() method with each object and display the results. Save the application
as CreateAliens.java.

Explanation / Answer

Note: Here in th requirement as mentioned The Alien class has atleast 3 data members.So I took noOfEyes,noOfHands,noOfLegs.If you want me to change Just intimate,I will modify.

__________________________

Alien.java

public class Alien {
   //Declaring variables
   protected int noOfEyes;
   protected int noOfHands;
   protected int noOfLegs;
  
   //Parameterized constructor
   public Alien(int noOfEyes, int noOfHands, int noOfLegs) {
       super();
       this.noOfEyes = noOfEyes;
       this.noOfHands = noOfHands;
       this.noOfLegs = noOfLegs;
   }
   //toString() method displays the contents of an object inside it
   @Override
   public String toString() {
       return "Alien# NoOfEyes=" + noOfEyes + " NoOfHands=" + noOfHands
               + " NoOfLegs=" + noOfLegs;
   }
  
  

}

_____________________

Martian.java

public class Martian extends Alien {

   //Parameterized constructor
   public Martian(int noOfEyes, int noOfHands, int noOfLegs) {
       super(noOfEyes, noOfHands, noOfLegs);

   }

   //toString() method displays the contents of an object inside it
   @Override
   public String toString() {
       return " Martian# NoOfEyes=" + noOfEyes + " NoOfHands=" + noOfHands
               + " NoOfLegs=" + noOfLegs;
   }
      
}

______________________

Jupiterian.java

public class Jupiterian extends Alien {

   //Parameterized constructor
   public Jupiterian(int noOfEyes, int noOfHands, int noOfLegs) {
       super(noOfEyes, noOfHands, noOfLegs);
      
   }
  
   //toString() method displays the contents of an object inside it
   @Override
   public String toString() {
       return " Jupiterian# NoOfEyes=" + noOfEyes + " NoOfHands=" + noOfHands
               + " NoOfLegs=" + noOfLegs;
   }
}

_____________________

CreateAliens.java

public class CreateAliens {

   public static void main(String[] args) {
       //Creating an Martian class object by passing the arguments
       Martian m=new Martian(4, 2, 2);
      
       /* Calling the toString() method on the Martian
       * class object to display the contents of it
       */
       System.out.println(m.toString());
      
       //Creating an Jupiterian class object by passing the arguments
       Jupiterian j=new Jupiterian(2, 2, 2);
      
       /* Calling the toString() method on the Martian
       * class object to display the contents of it
       */
       System.out.println(j.toString());

   }

}

________________________

Output:

Martian#
NoOfEyes=4
NoOfHands=2
NoOfLegs=2

Jupiterian#
NoOfEyes=2
NoOfHands=2
NoOfLegs=2

_______________Thank You

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