Question

Part I:

Problem: Code the following in Java:

Candy Class

-price

-number of pounds sold

Create the following methods:

-Two constructors – default and second

- accessor and mutator methods for each of the fields. - check for invalid price. Negative price is invalid (use if then

else and display error message)

- a method named userInput to get user input for all the fields. - check for invalid price. Negative price is invalid

(use a loop to prompt the user to enter correct price)

- method name displayAll to display all attributes

- a method named calcCashCollected to calculate and return the amount of cash collected by the selling the candy

– which is calculated by multiplying the price and number of pounds sold

-a method named calcDiscountPrice to calculate and return the discounted price of the candy. (application will send discount rate via parameter).

Answer 1

Candy.java

import java.util.Scanner;

public class Candy {
private double price;
private int poundsSold;
  
public Candy()
{
this.price = 0.0;
this.poundsSold = 0;
}
  
public Candy(double price, int poundsSold)
{
this.price = price;
this.poundsSold = poundsSold;
}

public double getPrice() {
return price;
}

public void setPrice(double price) {
if(price < 0)
System.out.println("Price cannot be negative!");
else
this.price = price;
}

public int getPoundsSold() {
return poundsSold;
}

public void setPoundsSold(int poundsSold) {
if(poundsSold < 0)
System.out.println("Pounds sold value cannot be negative!");
else
this.poundsSold = poundsSold;
}
  
public void userInput()
{
Scanner sc = new Scanner(System.in);
System.out.print("Enter the price of the candy: $");
double candyPrice = Double.parseDouble(sc.nextLine().trim());
while(candyPrice < 0)
{
System.out.print("Invalid Input!\nEnter the price of the candy: $");
candyPrice = Double.parseDouble(sc.nextLine().trim());
}
  
System.out.print("Enter number of pounds candy sold: ");
int pSold = Integer.parseInt(sc.nextLine().trim());
while(pSold < 0)
{
System.out.print("Invalid Input!\nEnter number of pounds candy sold: ");
pSold = Integer.parseInt(sc.nextLine().trim());
}
  
setPrice(candyPrice);
setPoundsSold(pSold);
}
  
public void displayAll()
{
System.out.println("Price of candy: $" + String.format("%.2f", getPrice())
+ "\nNumber of pounds of candy sold: " + getPoundsSold());
}
  
public double calcCashCollected()
{
return(getPrice() * getPoundsSold());
}
  
public double calcDiscountPrice(double discountPercent)
{
return((discountPercent / 100) * calcCashCollected());
}
}

CandyClassTester.java (Main class)

public class CandyClassTester {
  
public static void main(String[] args)
{
Candy candy = new Candy();
  
candy.userInput();
  
System.out.println();
candy.displayAll();
  
System.out.println("Total cash collected: $" + String.format("%.2f", candy.calcCashCollected()) + "\n"
+ "Discount at 15% : " + String.format("%.2f", candy.calcDiscountPrice(15)) + "\n"
+ "Final price to pay: $"
+ String.format("%.2f", candy.calcCashCollected() - candy.calcDiscountPrice(15)));
}
}

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