Question

Use inheritance to implement the following classes: A: A Car that is a Vehicle and has a name, a max_speed value and an instance variable called the number_of_cylinders in its engine. Add public methods to set and get the values of these variables. When a car is printed (using the toString method), its name, max_speed and number_of_cylinders are shown. B: An Airplane that is also a vehicle and has a name, a max_speed value and an instance variable called the number_of_engines it has. Add public methods to set and get the values of these variables. When an airplane is printed (using the toString method), its name, max_speed and number_of_engines are shown. C: Write a VehicleDemo.java class that does the following: 1- Creates an instance of a Car and an Airplane class. 2- Assign values to the name, speed, number_of_cylinders (for the Car object) and number_of_engines (for the Airplane object) variables. 3- Compares which vehicle goes faster and prints the result. 4- Prints the instances of the car and airplane classes.needed coding in java

Answer 1

Vehicle.java

public class Vehicle {
   //Declaring variables
   private String name;
   private int max_speed;
  
   //Parameterized constructor
   public Vehicle(String name, int max_speed) {
       super();
       this.name = name;
       this.max_speed = max_speed;
   }
  
   //Setters and getters
   public String getName() {
       return name;
   }
   public void setName(String name) {
       this.name = name;
   }
   public int getMax_speed() {
       return max_speed;
   }
   public void setMax_speed(int max_speed) {
       this.max_speed = max_speed;
   }
   @Override
   public String toString() {
       return "Name=" + name + "\nMax Speed=" + max_speed;
   }
  
   }

______________________

Car.java

public class Car extends Vehicle {

   //Declaring instance variables
   int no_of_cylinders;

  
   //parameterized constructor
   public Car(String name, int max_speed, int no_of_cylinders) {
       super(name, max_speed);
       this.no_of_cylinders = no_of_cylinders;
   }

   //getters and setters
   public int getNo_of_cylinders() {
       return no_of_cylinders;
   }

   public void setNo_of_cylinders(int no_of_cylinders) {
       this.no_of_cylinders = no_of_cylinders;
   }

   //toString() method is used to display the contents of an object inside it
   @Override
   public String toString() {
       System.out.println("\n** CAR **");
       System.out.println(super.toString());
       return "No of cylinders=" + no_of_cylinders;
   }

}

_________________________

Airplane.java

public class Airplane extends Vehicle {
   //Declaring instance variables
   int no_of_engines;

   //parameterized constructor
   public Airplane(String name, int max_speed, int no_of_engines) {
       super(name, max_speed);
       this.no_of_engines = no_of_engines;
   }

   //getters and setters
   public int getNo_of_engines() {
       return no_of_engines;
   }

   public void setNo_of_engines(int no_of_engines) {
       this.no_of_engines = no_of_engines;
   }

   //toString() method is used to display the contents of an object inside it
   @Override
   public String toString() {
       System.out.println("\n** AIRPLANE **");
       System.out.println(super.toString());
       return "No of engines=" + no_of_engines;
   }
  

}

______________________

VehicleDemo.java

public class VehicleDemo {

   public static void main(String[] args) {
       //Creating the references of Vehicle class
       Vehicle car,airplane;
      
       //creating the Car class object
       car=new Car("Ferrari",300,12);
      
       //creating the Airplane class object
       airplane=new Airplane("Boeing 747-8",700,4);
      
      
       //Calling the toString() method on the Car class object
       System.out.println(car.toString());
      
       //Calling the toString() method on the Airplane class object
       System.out.println(airplane.toString());

   }

}

____________________________

output:

** CAR **
Name=Ferrari
Max Speed=300
No of cylinders=12

** AIRPLANE **
Name=Boeing 747-8
Max Speed=700
No of engines=4

________________Thank You