INSY 4305 Lab 3 Instructions Cruiseship Cargo Ship Class

Insy 4305 Lab 3 Instructionsship Cruiseship Cargoship Classes Anddi

Design an abstract Ship class that has the following members:

• A field for the name of the ship (a string).
• A field for the year that the ship was built (a string).
• A constructor and appropriate accessor and mutators.
• A toString method that displays the ships 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).
• A constructor, a copy 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).
• A constructor, a copy 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.

In a driver program (shipDemo.java),

1. Demonstrate the classes in a Ship array by assigning various CruiseShip and CargoShip objects to the array elements, then iterate through the array, calling each object's display method (polymorphism).
2. Create an ArrayList of Ship objects, add various CruiseShip and CargoShip objects, then iterate through the list, calling each object's toString method (polymorphism).
3. Test the copy constructors in both CruiseShip and CargoShip within shipDemo.java.

Interface to your lab 3 (Ship implements Displayable):

public interface Displayable {
void display();
}

Paper For Above instruction

The implementation of a comprehensive object-oriented program that models different types of ships involves creating a flexible class hierarchy with polymorphic behavior. This program uses abstract classes, inheritance, interfaces, and collections in Java to demonstrate the principles of object-oriented programming (OOP) for managing ship objects, specifically CruiseShip and CargoShip subclasses derived from an abstract Ship class.

Abstract Ship Class Design

The foundation of this program is the abstract class Ship, which encapsulates common attributes and behaviors shared by all ships. It contains private fields for the ship's name and the year it was built, ensuring encapsulation. The constructor initializes these fields, and accessor (getter) and mutator (setter) methods provide controlled access and modification. The toString method offers a standard string representation for any Ship object, displaying its name and year built, which simplifies debugging and logging.

CruiseShip and CargoShip Subclass Designs

The CruiseShip class extends the Ship class and introduces an additional attribute: the maximum number of passengers it can accommodate. This class includes a parameterized constructor for initializing all fields, a copy constructor for creating deep copies, and overridden methods to display information specific to cruise ships. Its toString method is overridden to include only the ship's name and passenger capacity for concise output.

Similarly, the CargoShip class also extends Ship and adds a cargo capacity attribute. Its constructors and methods follow the same pattern, with an overridden toString that presents only the necessary information: the ship’s name and cargo capacity, emphasizing efficiency and specificity.

Interface Implementation and Polymorphism

Both CruiseShip and CargoShip classes implement the Displayable interface, which requires a display method. This design allows for polymorphism, where objects of different subclasses can be treated uniformly through the interface reference. In the driver program, an array of Ship references is created, and various objects are assigned to it. During iteration, calling the display method on each element demonstrates runtime polymorphism, as the appropriate subclass method executes dynamically.

Collection Handling with ArrayList

Furthermore, the program showcases the flexibility and dynamic nature of the ArrayList collection by storing different ship objects. As with the array, each object’s toString method, overridden in subclasses, produces meaningful output. This approach underscores the importance of polymorphism in collection management, allowing diverse objects to be processed uniformly.

Copy Constructors and Testing

Testing copy constructors ensures the reliability of object cloning, particularly when deep copies are necessary to avoid shared references that could lead to bugs. Both CruiseShip and CargoShip classes include copy constructors that duplicate objects' internal state, verifying correct implementation via dedicated test cases in the driver program. This aspect emphasizes good practices in object management and cloneability in Java.

Conclusion

This program demonstrates key OOP concepts such as inheritance, polymorphism, encapsulation, and abstraction, effectively modeling a variety of ships in a flexible and extensible manner. It showcases how interfaces facilitate behavior sharing and how collections enable dynamic management of diverse objects. Proper use of constructors, especially copy constructors, underlines sound design in cloning objects, a critical aspect in complex software systems. Such implementations are foundational in software engineering, especially in domains requiring detailed and organized object models like maritime management systems.

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