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$/*$

$*$ TCSS $143$ B $-$ Fundamentals Of Object$-$Oriented Programming Theory And Application

$-$ Fall $2023$

$*$ Instructor: Dr$.$ Dongfang Zhao

$*$ Programming Assignment $1$

$*/$

import java.util.Scanner;

$/**$

$*$ This is the main class for the GroceryList program. This program will perform

$*$ some operations on the list.

$*$ The operations are adding an item to the list, displaying the total cost of

$*$ the items, modifying the quantity of an item in the list and printing the

$*$ list.

$*$

$*$ @author TCSS $143$ B Instruction Team

$*$ @version $0\mathrm{.}1$

$*/$

public class GroceryMain $\{$

$/**$

$*$ This is the main method for the GroceryMain class.

$*$

$*$ @param theArgs is used for the commandline arguments.

$*/$

public static void main$($String$[]$ theArgs$)\{$

System.out.println$("$Welcome to the Programming Assignment $1$ Grocery List

Program!"$)$;

System.out.println$("$This test program will perform some operations on the

list"$)$;

$//$ Creates an object of the GroceryList class.

GroceryList list $=$ new GroceryList$()$;

$//$ While loop to prompt the user to enter the choice for the operation to

be

$//$ performed on the list untill the user wants to exit.

while $($true$)\{$

System.out.println$("$What would you like to do $?")$;

System.out.println$("$Enter $1$ to Add an item to the list"$)$;

System.out.println$("$Enter $2$ to Display the total cost of the items"$)$;

System.out.println$("$Enter $3$ to Modify the quantity of an item in the

list"$)$;

System.out.println$("$Enter $4$ to print the list"$)$;

System.out.println$("$Enter $5$ to Exit the program"$)$;

$//$ Scanner object to read the choice$/$input from the user for the

operation to be

$//$ performed on the list.

Scanner input $=$ new Scanner$($System$.$in$)$;

$//$ Reading the choice from the user and performing the operation based

on the

$//$ choice.

int choice $=$ input.nextInt$()$;

$//$ If the user enters $1$ then the program will add an item to the list.

if $($choice $==1)\{$

$//$ If the number of items in the list is $10$ then the program will

display the

$//$ below message.

if $($list$.$getNumItems$()==10)\{$

System.out.println$("$Number of items in the list is $10.$ Cannot

add more items to the list."$)$;

System.out.println$("-----------------------------------------")$;

$\}$

$//$ If the number of items in the list is less than $10$ then the

program will add

$//$ an item to the list.

else $\{$

System.out.println$("$Enter the name of the item"$)$;

String name $=$ input.next$()$;

System.out.println$("$Enter the quantity of the item"$)$;

int quantity $=$ input.nextInt$()$;

if $($quantity $<1)\{$

System.out.println$("$ The Quantity cannot be less than $1.$

Make sure to enter atleast $1")$;

$\}$

System.out.println$("$Enter the price of the item"$)$;

double price $=$ input.nextDouble$()$;

if $($price $<0)\{$

System.out.println$("$ Price cannnot be less than $0.$ Make

sure to enter more than $0")$;

$\}$

list.add$($new GroceryItemOrder$($name$,$ quantity, price$))$;

System.out.println$("$Item added to the list successfully"$)$;

System.out.println$("-----------------------------------------")$;

$\}$

$\}$

$//$ If the user enters $2$ then the program will display the total cost of

the

$//$ items in the list.

else if $($choice $==2)\{$

System.out.println$("$Total cost of the items in the list so far is $"$

$+$ list.getTotalCost$())$;

System.out.println$("-----------------------------------------")$;

$\}$

$//$ If the user enters $3$ then the program will modify the quantity of an

item in

$//$ the list.

else if $($choice $==3)\{$

$//$ If the number of items in the list is $0$ then the program will

display the

$//$ below message.

if $($list$.$getNumItems$()==0)\{$

System.out.println$("$No items in the list to modify"$)$;

System.out.println$("-----------------------------------------")$;

$\}$

$//$ If the number of items in the list is not $0$ then the program

will modify the

$//$ quantity of an item in the list.

else $\{$

System.out.println$("-----------------------------------------")$;

System.out.println$("$The items in the list are"$)$;

System.out.println$($list$.$toString$())$;

System.out

$.$println$("$Please make sure to enter the index of the

item correctly$($Index starts from $0)")$;

System.out.println$("$Enter the index of the item to modify the

quantity"$)$;

int index $=$ input.nextInt$()$;

if $($index $<0)\{$

System.out.println$("$ The index cannot be less than $0")$;

$\}$

System.out.println$("$Enter the new quantity of the item"$)$;

int quantity $=$ input.nextInt$()$;

if $($quantity $<1)\{$

System.out.println$("$ The Quantity cannot be less than $1.$

Make sure to enter atleast $1")$;

$\}$

list.modifyItem$($index$,$ quantity$)$;

System.out.println$("$Item Quantity modified successfully"$)$;

System.out.println$("-----------------------------------------")$;

$\}$

$\}$

$//$ If the user enters $4$ then the program will print the list.

else if $($choice $==4)\{$

$//$ If the number of items in the list is $0$ then the program will

display the

$//$ below message.

if $($list$.$getNumItems$()==0)\{$

System.out.println$("$No items in the list to print"$)$;

System.out.println$("-----------------------------------------")$;

$\}$

$//$ If the number of items in the list is not $0$ then the program

will print the