Task 1: The OrderManager class built during the example discussion does not define a constructor. Add aprivate constructor to the OrderManager class. What changes must be made to the OrderManager class sothat client objects can create OrderManager instances?public class OrderManager (private int orderID = 0;private OrderManager () {se)//Meant to be used internallyprivate int getNextID () {++orderID;return order ID;}//public method to be used by client objectspublic void saveOrder (String item, int qty) {int ID getNextID ();System.out.println("Order ID=" + ID + "; Item=" + item +"; Qty=" + qty + " is saved. ");1 package privat;23 public class MainApp {34567894058}public static void main(String[] args) {OrderManager om = new OrderManager ();om.saveOrder ("

Task 1: The OrderManager class built during the example discussion does not define a constructor. Add a private constructor to the OrderManager class. What changes must be made to the OrderManager class so that client objects can create OrderManager instances? public class OrderManager ( private int orderID = 0; private OrderManager () 4 //Meant to be used internally private int getNextID () { } ++orderID; return orderID; //public method to be used by client objects public void saveOrder (String item, int qty) { } int ID getNextID(); System.out.println("Order ID="+ID+"; Item=" + item + "; Qty=" + qty+" is saved. "); 1 package privat; 3 public class MainApp ( public static void main(String[] args) { OrderManager om new OrderManager ().; om.saveOrder ("

Task 1: The OrderManager class built during the example discussion does not define a constructor. Add a private constructor to the OrderManager class. What changes must be made to the OrderManager class so that client objects can create OrderManager instances? public class OrderManager ( private int orderID = 0; private OrderManager () 4 //Meant to be used internally private int getNextID () { } ++orderID; return orderID; //public method to be used by client objects public void saveOrder (String item, int qty) { } int ID getNextID(); System.out.println("Order ID="+ID+"; Item=" + item + "; Qty=" + qty+" is saved. "); 1 package privat; 3 public class MainApp ( public static void main(String[] args) { OrderManager om new OrderManager ().; om.saveOrder ("

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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Concept explainers

OOPs

In today's technology-driven world, computer programming skills are in high demand. The object-oriented programming (OOP) approach is very much useful while designing and maintaining software programs. Object-oriented programming (OOP) is a basic programming paradigm that almost every developer has used at some stage in their career.

Constructor

The easiest way to think of a constructor in object-oriented programming (OOP) languages is:

Question

Task 1: The OrderManager class built during the example discussion does not define a constructor. Add a
private constructor to the OrderManager class. What changes must be made to the OrderManager class so
that client objects can create OrderManager instances?
public class OrderManager (
private int orderID = 0;
private OrderManager () {
se)
//Meant to be used internally
private int getNextID () {
++orderID;
return order ID;
}
//public method to be used by client objects
public void saveOrder (String item, int qty) {
int ID getNextID ();
System.out.println("Order ID=" + ID + "; Item=" + item +
"; Qty=" + qty + " is saved. ");
1 package privat;
2
3 public class MainApp {
3456789
40
5
8}
public static void main(String[] args) {
OrderManager om = new OrderManager ();
om.saveOrder ("<From Z
}
The constructor OrderManager() is not visible
1 quick fix available:
Change visibility of 'OrderManager()' to 'package!

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Task 2: Design an Order class (UML) with accessor methods for its instance variables. Order orderID: integer Items: Vector tax: double shipping: double Paid: boolean