Question

Part I:

1. Have a program class named TestArrays This class should have a main() method that behaves as follows:
2. Have an integer array of size 10.
3. Using a loop, fill the elements with increments of 5, starting with 5 in the first element.
4. Using the array elements, sum the second, fifth and seventh elements.
5. Display the sum with a label.
6. Change the fourth element to 86.
7. Subtract 9 from the ninth element.
8. Using a loop, display the elements of the array.
9. Compile and execute the code to ensure correct results.
10. Don't forget to include descriptive and detailed comments in your code!!!

Part II

1. have a toString() method for the Vehicle class that would display the attributes of the class.
2. have an array of 7 elements that will hold Vehicle references.
3. Using a loop, assign the first 4 elements to Vehicle objects using the null constructor.
4. Instantiate a Vehicle object with a base price of $37,000 and additional features of $400.
5. Assign the object to the 5th element of the array.
6. Assign the 6th element of the array to a Vehicle object with a base price of $24,000 and additional features of $5500.
7. Assign the 7th element of the array to a Vehicle object with a base price of $53,000 and additional features of $9000.
8. Calculate the total price for the 5th, 6th and 7th vehicles in the array.
9. Using an array, display the attributes of the objects in the array calling the toString().

//import statements

import java.util.Scanner;

public class Vehicle

{

//Attributes of class Vehicle

private double basePrice;

private double otherFeatures;

private double totalPrice;

//constructors

//no argument constructors

public Vehicle(){

  basePrice = 25000;

  otherFeatures = 3000;

  totalPrice = basePrice + otherFeatures;

}

//one argument constructor

public Vehicle(double basePrice){

  basePrice = basePrice;

otherFeatures = 0;

  totalPrice = basePrice + otherFeaturese;

}

//two argument constructor

  public Vehicle(double basePrice,double otherFeatures){

   basePrice = basePrice;

   otherFeatures = otherFeatures;

totalPrice = basePrice + otherFeaturese;

  }

  //getters

  public double getBestPrice(){

   return basePrice;

  }

  public double getOtherFeaturese(){

   return otherFeatures;

  }

  public double getTotalPrice(){

   return totalPrice;

  }

  //setters

  public void setBasePrice(double basePrice){

   basePrice = basePrice;

  }

  public void setotherFeatures(double additionalPrice){

  otherFeatures = otherFeatures;

  }

  public void calcTotalPrice(){

    totalPrice = basePrice + otherFeatures;

  }

}//End of class Vehicle

class testVehicle{

public static void main(String[] args){

//creating instances of class Vehicle

Vehicle Ford = new Vehicle();

Vehicle Toyota = new Vehicle(36000);

Vehicle Porsche = new Vehicle(64000,7000);

//changing base price of Ford to 28000

Ford.setBasePrice(28000);

//changing additional price of Toyota to 4500

Toyota.setOtherFeatures(4500);

//changing base price of Porsche to 72000

Porsche.setBasePrice(72000);

//Calculating total price for each vehicles.

Ford.calcTotalPrice();

Toyota.calcTotalPrice();

Porsche.calcTotalPrice();

//Calculating total price of 3 vehicles.

double totalCost = Ford.getTotalPrice()+Toyota.getTotalPrice()+Porsche.getTotalPrice();

  //displaying prices of vehicles

  System.out.println("Vehicle: Ford, Base Price: $ "+Ford.getBestPrice()

           +", otherFeatures: $ "+Ford.getOtherFeatures()

           +", Total cost: $ "+Ford.getTotalPrice());

  System.out.println("Vehicle: Toyota, Base Price: $ "+Toyota.getBestPrice()

           +", otherFeatures Cost: $ "+Toyota.getotherFeatures()

           +", Total cost: $ "+Toyota.getTotalPrice());

  System.out.println("Vehicle: Porsche, Base Price: $ "+Porsche.getBestPrice()

           +", otherFeatures: $ "+Porsche.getOtherFeatures()

           +", Total cost: $ "+Porsche.getTotalPrice());

  //displaying total cost of all 3 vehicles

  System.out.println("Total cost of all 3 Vehicles: "+totalCost);

}//End of main() function

}//End of class testVehicle

Answer 1

(Part i) The java code is as follows:-

import java.util.*;
public class TestArrays
{
   public static void main(String[] args)
   {
   int []arr=new int[10]; //Have an integer array of size 10
   int sum=0;
   for(int i=0;i<10;i++)//Using a loop, fill the elements with increments of 5, starting with 5 in the first element.
   arr[i]=i*5+5;
   sum+=arr[1]+arr[4]+arr[6];//Using the array elements, sum the second, fifth and seventh elements.
   System.out.println("Sum of second, fifth and seventh element is : "+sum);//Display the sum with a label.
   arr[3]=86;//Change the fourth element to 86.
   arr[8]-=9;//Subtract 9 from the ninth element.
   for(int i=0;i<10;i++)//Using a loop, display the elements of the array.
   System.out.print(arr[i]+" ");
   }
}

The output of the above code is as follows:-

Sum of second, fifth and seventh element is : 70
5 10 15 86 25 30 35 40 36 50

The screenshot of the above code is as follows:-

(Part ii) The java code is as follows:-

import java.util.Scanner;
class Vehicle
{
//Attributes of class Vehicle
private double basePrice;
private double otherFeatures;
private double totalPrice;
//constructors
//no argument constructors
public Vehicle()
{
basePrice = 25000;
otherFeatures = 3000;
totalPrice = basePrice + otherFeatures;
}
//one argument constructor
public Vehicle(double basePrice)
{
basePrice = basePrice;
otherFeatures = 0;
totalPrice = basePrice + otherFeatures;
}
//two argument constructor
public Vehicle(double basePrice,double otherFeatures)
{
this.basePrice = basePrice;
this.otherFeatures = otherFeatures;
this.totalPrice = basePrice + otherFeatures;
}
//getters
public double getBestPrice()
{
return this.basePrice;
}
public double getOtherFeatures()
{
return this.otherFeatures;
}
public double getTotalPrice()
{
return this.totalPrice;
}
//setters
public void setBasePrice(double basePrice)
{
this.basePrice = basePrice;
}
public void setOtherFeatures(double additionalPrice)
{
this.otherFeatures = otherFeatures;
}
public void calcTotalPrice()
{
totalPrice = basePrice + otherFeatures;
}
@Override
public String toString()
{
return "Base Price: $ "+this.getBestPrice()
+", otherFeatures: $ "+this.getOtherFeatures()
+", Total cost: $ "+this.getTotalPrice();
}
}//End of class Vehicle
class testVehicle
{
public static void main(String[] args)
{
//creating instances of class Vehicle
double totalCost=0;
Vehicle []obj=new Vehicle[7];
for(int i=0;i<7;i++)
{
if(i<4)
obj[i]=new Vehicle();
else if(i==4)
obj[i]=new Vehicle(37000,400);
else if(i==5)
obj[i]=new Vehicle(24000,5500);
else
obj[i]=new Vehicle(53000,9000);
}
obj[4].calcTotalPrice();
obj[5].calcTotalPrice();
obj[6].calcTotalPrice();
for(int i=0;i<7;i++)
{
System.out.println("Vehicle "+(i+1)+": "+obj[i].toString());
totalCost+=obj[i].getTotalPrice();
}
//displaying total cost of all 3 vehicles
System.out.println("Total cost of all Vehicles: "+totalCost);
}//End of main() function
}//End of class testVehicle

The output of the above code is as follows:-

Vehicle 1: Base Price: $ 25000.0, otherFeatures: $ 3000.0, Total cost: $ 28000.0
Vehicle 2: Base Price: $ 25000.0, otherFeatures: $ 3000.0, Total cost: $ 28000.0
Vehicle 3: Base Price: $ 25000.0, otherFeatures: $ 3000.0, Total cost: $ 28000.0
Vehicle 4: Base Price: $ 25000.0, otherFeatures: $ 3000.0, Total cost: $ 28000.0
Vehicle 5: Base Price: $ 37000.0, otherFeatures: $ 400.0, Total cost: $ 37400.0
Vehicle 6: Base Price: $ 24000.0, otherFeatures: $ 5500.0, Total cost: $ 29500.0
Vehicle 7: Base Price: $ 53000.0, otherFeatures: $ 9000.0, Total cost: $ 62000.0
Total cost of all Vehicles: 240900.0