Question

[JAVA]

Program:

• Design a Ship class that the following members:
  • A field for the name of the ship (a string) o A field for the year the the ship was built (a string) o A constructor and appropriate accessors and mutators
  • A toString method that displays the ship's name and the year it was built

• Design a CruiseShip class that extends the Ship class. The CruiseShip class should have the following members:
  • A field for the maximum number of passengers (an int) o A constructor and appropriate accessors and mutators
  • A toString method that overrides the toString method in the base class. The CruiseShip class's toString method should display only the ship's name and the maximum number of passengers

• Design a CargoShip class that extends the Ship class. The CargoShip class should have the following members:
  • A field for the cargo capacity in tonnage (an int) o A constructor and appropriate accessors and mutators
  • A toString method that overrides the toString method in the base class. The CargoShip class's toString method should display only the ship's name and the ship's cargo capacity

• Design an interface called Militarizable with a method called fireWeapons

• Design a Destroyer class that extends the Ship class and implements the Militarizable interface (show “Weapons Fired!” message when fireWeapons is called). The class should have the following members:
  • A field for the number of rockets available (an int) o A field for the number of weapon platforms (an int) o A constructor and appropriate accessors and mutators
  • A toString method that overrides the toString method in the base class. The Destroyer class's toString method should display its current state

• Demonstrate the classes in a program that has a Ship array. Assign various Ship, CruiseShip, CargoShip, and Destroyer objects to the array elements. The program should then step through the array, calling each object's toString method.

Answer 1

Note: Could you plz go through this code and let me know if u need any changes in this.Thank You
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// Ship.java

public class Ship {
   // Declaring variables
   private String name;
   private int built_year;

   // Parameterized constructor
   public Ship(String name, int built_year) {
       this.name = name;
       this.built_year = built_year;

   }

   // Setters and Getters.
   public String getName() {
       return name;
   }

   public void setName(String name) {
       this.name = name;
   }

   public int getBuilt_year() {
       return built_year;
   }

   public void setBuilt_year(int built_year) {
       this.built_year = built_year;
   }

   // toString() method which displays the contents of the object inside it
   @Override
   public String toString() {
       return "\nShip #\nName=" + name + ",\nBuild Year=" + built_year;
   }

}

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// CargoShip.java

public class CargoShip extends Ship {
   //Declaring variables
       private int capacity_tonnage;
      
       //Parameterized constructor
       public CargoShip(String name, int built_year,int capacity) {
           super(name, built_year);
           this.capacity_tonnage=capacity;
          
       }
      
       //Setters and Getters.
       public int getCapacity_tonnage() {
           return capacity_tonnage;
       }
       public void setCapacity_tonnage(int capacity_tonnage) {
           this.capacity_tonnage = capacity_tonnage;
       }
      
       //toString() method which displays the contents of the object inside it
       @Override
       public String toString() {
          
           return "\nThis is CargoShip#\n"+super.getName()+"\nCapacity Tonnage=" + capacity_tonnage;
       }
      

}
_____________________

// CruiseShip.java

public class CruiseShip extends Ship {
     
       //Declaring variables
       private int capacity;
      
       //Parameterized constructor
       public CruiseShip(String name, int built_year,int capacity) {
           super(name, built_year);
           this.capacity=capacity;
       }
      
       //Setters and Getters.
       public int getCapacity() {
           return capacity;
       }
       public void setCapacity(int capacity) {
           this.capacity = capacity;
       }
      
       //toString() method which displays the contents of the object inside it
       @Override
       public String toString() {
           return "\nThis is CruiseShip#\nName="+super.getName()+"\nCapacity=" + capacity;
       }
}
_____________________

// Militarizable.java

public interface Militarizable {
   public void fireWeapons();
}
____________________

// Destroyer.java

public class Destroyer extends Ship implements Militarizable {

   private int noOfRockets;
   private int noOfWeaponPlatforms;

   public Destroyer(String name, int built_year, int noOfRockets,
           int noOfWeaponPlatforms) {
       super(name, built_year);
       this.noOfRockets = noOfRockets;
       this.noOfWeaponPlatforms = noOfWeaponPlatforms;
   }

   @Override
   public void fireWeapons() {
       System.out.println("Weapons Fired!");

   }

   @Override
   public String toString() {
       return "\nThis is Destroyer# [NoOfRockets=" + noOfRockets
               + ", noOfWeaponPlatforms=" + noOfWeaponPlatforms + "]"+super.toString();
   }

}
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// Test.java

public class Test {

   public static void main(String[] args) {
       Ship shipArray[] = new Ship[4];
       shipArray[0] = new Ship("The Ship", 2009);
       shipArray[1] = new CargoShip("The CargoShip", 2000, 5000);
       shipArray[2] = new CruiseShip("The CruiseShip", 1999, 2000);
       shipArray[3] = new Destroyer("The BattleShip", 2009, 20, 4);
       for (int i = 0; i < shipArray.length; i++) {
           System.out.println(shipArray[i]);
       }

   }

}
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Output:

Ship #
Name=The Ship,
Build Year=2009

This is CargoShip#
The CargoShip
Capacity Tonnage=5000

This is CruiseShip#
Name=The CruiseShip
Capacity=2000

This is Destroyer# [NoOfRockets=20, noOfWeaponPlatforms=4]
Ship #
Name=The BattleShip,
Build Year=2009

_______________Could you plz rate me well.Thank You