Answered: in a loop that continues until a user…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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This is the question -

In the exercises in Chapter 6, you created a class named Purchase. Each Purchase contains an invoice number, amount of sale, amount of sales tax, and several methods. Add get methods for the invoice number and sale amount fields so their values can be used in comparisons.

Next, write a program that declares an array of five Purchase objects and prompt a user for their values. Then, in a loop that continues until a user inputs a sentinel value of Z, ask the user whether the Purchase objects should be sorted and displayed in invoice number order or sale amount order.

This is the code I have. The programming isn't likeing what I have at all for the area where it says to write code -

public class Purchase

{

private int invoiceNumber;

private double saleAmount;

private double tax;

private static final double RATE = 0.05;

public void setInvoiceNumber(int num)

{

invoiceNumber = num;

}

public void setSaleAmount(double amt)

{

saleAmount = amt;

tax = saleAmount * RATE;

}

public double getSaleAmount()

{

return saleAmount;

}

public int getInvoiceNumber()

{

return invoiceNumber;

}

public void display()

{

System.out.println("Invoice #" + invoiceNumber +

" Amount of sale: $" + saleAmount + " Tax: $" + tax);

}

------------------------------------------------------------------

import java.util.Scanner;

public class SortPurchasesArray {

public static void main(String[] args) {

// Write your code here

//create a Scanner class object

Scanner scan=new Scanner(System.in);

//create of 5 Purchase objects

Purchase[] p=new Purchase[5];

//declare a string variables

String choice;

//read sales amount and invoice for five Purchase objects

for (int i = 0; i < p.length; i++)

{

p[i]=new Purchase();

System.out.printf("Enter sale amount,$: ");

double sales=Double.parseDouble(scan.nextLine());

System.out.printf("Enter invoice number#: ");

int invoice=Integer.parseInt(scan.nextLine());

p[i].setInvoiceNumber(invoice);

p[i].setSaleAmount(sales);

}

//do while continues until user enters 'Z' to stop loop

{

System.out.println("***Menu***");

System.out.println("a. sort by sales");

System.out.println("b. sort by invoice");

System.out.println("Enter your choice or Z to exit: ");

choice=scan.nextLine();

//check if choice is "a"

if(choice.equals("a"))

{

sortBySaleAmount(p);

display(p, "Sort By Sales");

}

//check if choice is "b"

else if(choice.equals("b"))

{

sortByInvoice(p);

display(p, "Sort By Invoice");

}

}while(!choice.equals("Z"));

}

/*static method , sortBySaleAmount that takes Purchase array

* and then sort the data by sales amount. */

}

public static void sortBySaleAmount(Purchase[] array) {

// Write your code here

int n = array.length;

Purchase temp = null;

for(int i=0; i < n; i++)

{

for(int j=1; j < (n-i); j++)

{

if(array[j-1].getSaleAmount()> array[j].getSaleAmount())

{

//swap elements

temp = array[j-1];

array[j-1] = array[j];

array[j] = temp;

}

/*static method , sortByInvoice that takes Purchase array

* and then sort the data by invoice account number. */

}

public static void sortByInvoice(Purchase[] array) {

// Write your code here

int n = array.length;

Purchase temp = null;

for(int i=0; i < n; i++)

{

for(int j=1; j < (n-i); j++)

{

if(array[j-1].getInvoiceNumber()> array[j].getInvoiceNumber())

{

//swap elements

temp = array[j-1];

array[j-1] = array[j];

array[j] = temp;

}

/*static display method that takes a Purchase array and message

* as input arguments and then display the Purchase and message*/

}

public static void display(Purchase[] p, String msg) {

// Write your code here

// Write code here

System.out.println(msg);

for (int index = 0; index < p.length; index++)

{

p[index].display();

}

}//end of the display method

}

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