Question

1. Create a base class called Vehicle that has the manufacturer’s name (type String), number of cylinders in the engine (type int). Then create a class called Truck that is derived from Vehicle and has additional properties: the load capacity in tons (type double) and towing capacity in tons (type double).

Add the following methods to the Vehicle class:

1. A default constructor that sets the vehicle class properties to default values (manufacturer = "None"; cylinders = 0).
2. A constructor that sets a vehicle properties (manufacturer and cylinders) to a specified values.
3. The accessor and mutator methods for manufacturer and cylinders.
4. A method called writeOutput that prints out a vehicle object information (manufacturer and cylinders).
5. A method named equals to test whether two instances of vehicle objects are equal. The method returns Boolean data type.

Add the following methods to the Truck class:

1. A default constructor that sets the truck class properties to default values (load capacity = 0; towing capacity = 0).
2. A constructor that sets a truck properties (manufacturer, cylinders, load capacity, and towing capacity) to a specified values.
3. The accessor and mutator methods for load capacity, and towing capacity.
4. A method called writeOutput that overrides the writeOutput from Vehicle. This new version needs to prints out a truck object information (manufacturer, cylinders, load capacity, and towing capacity).
5. A method named equals to test whether two instances of truck objects are equal. The method returns Boolean data type.

Write a driver program that tests all your methods. Create at least two objects of truck class, and two objects of vehicle class.

(JAVA)

Answer 1

// Screenshot of the code

// Sample output

// Code to copy

Vehicle.java

public class Vehicle {
   private String maker;
   private int cylinders;
  

   public Vehicle()
   {
   maker="none";
   cylinders=1;
     
   }
   public Vehicle(String m,int n)//m is maker,n is the number of cylinders
   {
   maker=m;
   cylinders=n;
     
   }
  
   public void setMaker(String m)
   {
   maker=m;
   }
   public void setCylinders(int newNum)
   {
   cylinders=newNum;
   }
  
   public String getMaker()
   {
   return maker;
   }
   public int getCylinders()
   {
   return cylinders;
   }
  
   public String writeOutput()
   {
   return "\nManufacturer: "+maker+"\nEngine: "+cylinders;
   }
   public boolean equals(Vehicle other)
   {
   return maker.equals(other.maker)&&cylinders==other.cylinders;
   }
}

Truck.java

public class Truck extends Vehicle{
   private double loadCap;
   public double towCap;

   public Truck()
   {
   super();
   loadCap=0.00;
   towCap=0.00;
   }
   public Truck(String maker,int cylinders,double loadCapa,double towCapa)
   {
   super(maker,cylinders);
   loadCap=loadCapa;
   towCap=towCapa;
   }
     
   public void setLoadCap(double newLoadCap)
   {
   loadCap=newLoadCap;
   }
   public void setTowCap(double towCap2)
   {
   towCap=towCap2;
   }
   public double getLoadCap()
   {
   return loadCap;
   }
   public double getTowCap()
   {
   return towCap;
   }
   public String writeOutput()
   {
   return super.toString()+","+loadCap+" pound load, "+towCap+" tow";
   }
   public boolean equals(Truck other)
   {
   return super.equals(other)&&loadCap==other.loadCap&&towCap==other.towCap;
   }
}

VehicleDemo.java

import java.util.Scanner;
public class VehicleDemo {

   public static void main(String[] args) {
       Scanner input =new Scanner(System.in);
     

   Vehicle aCar1=new Vehicle("Chevrolet",5);

   Vehicle aCar2=new Vehicle();
   String maker1;  
   int cylinders1;

   System.out.println("Input your cars info:");
   System.out.print("What is the manufacture name? ");
   maker1=input.nextLine();
  
   System.out.print("What is the number of cylinders? ");
   cylinders1=input.nextInt();     

   aCar2.setMaker(maker1);
   aCar2.setCylinders(cylinders1);
     

   Truck aTruck1=new Truck();
   aTruck1.setMaker("Toyota");
   aTruck1.setCylinders(6);
     
   aTruck1.setLoadCap(250.55);
   aTruck1.setTowCap(3000);

   Truck aTruck2=new Truck();
   String maker2;     
   int cylinders2;
   double towCap;
   double loadCap;

   System.out.println("\nInput your trucks info:");
   System.out.print("What is the manufacture name? ");
   maker2=input.next();  
   System.out.print("What is the number of cylinders? ");
   cylinders2=input.nextInt();
   System.out.print("What is the load capacity? ");
   loadCap=input.nextDouble();
   System.out.print("What is the tow capacity? ");
   towCap=input.nextDouble();
     

   aTruck2.setMaker(maker2);
   aTruck2.setCylinders(cylinders2);  
   aTruck2.setLoadCap(loadCap);
   aTruck2.setTowCap(towCap);

   System.out.println("\nFirst Cars info:");
   System.out.println(aCar1.getMaker());
   System.out.println(aCar1.getCylinders());
  

   System.out.println("\nSecond Cars info:");
   System.out.println(aCar2.getMaker());
   System.out.println(aCar2.getCylinders());
  

   System.out.println("\nFirst Trucks info:");
   System.out.println(aTruck1.getMaker());
   System.out.println(aTruck1.getCylinders());     
   System.out.println(aTruck1.getLoadCap());
   System.out.println(aTruck1.getTowCap());

   System.out.println("\nSecond Trucks info:");
   System.out.println(aTruck2.getMaker());
   System.out.println(aTruck2.getCylinders());  
   System.out.println(aTruck2.getLoadCap());
   System.out.println(aTruck2.getTowCap());

     
   if(aTruck1.equals(aTruck2)==true)
   {
   System.out.println("The trucks are both the same.");
   }
   else
   {
   System.out.println("The trucks are not the same.");
   }
   if(aCar1.equals(aCar2)==true)
   {
   System.out.println("The cars are both the same.");
   }
   else
   {
   System.out.println("The cars are not the same.");
   }
   input.close();
   }

}