Code: import java.util.Scanner; public class ReceiptMaker { public static final String SENTINEL = "checkout"; public final int MAX_NUM_ITEMS; public final int TAX_RATE; private String itemNames; private double [] itemPrices; private int numItemsPurchased; public ReceiptMaker(){ MAX_NUM_ITEMS = 10; TAX_RATE = .0875; itemNames = new String[MAX_NUM_ITEMS]; itemPrices = new double[MIN_NUM_ITEMS]; numItemsPurchased = 0; } public ReceiptMaker(int maxNumItems, double taxRate){ if(isValid(maxNumItems)){ MAX_NUM_ITEMS = maxNumItems; } else{ MAX_NUM_ITEMS= 10; } if(isValid(taxRate)){ TAX_RATE = taxRate; } else{ TAX_RATE = .0875; } itemNames = new String[MAX_NUM_ITEMS]; itemPrices = new double[MAX_NUM_ITEMS]; numItemsPurchased = 0; } public void greetUser(){ System.out.println("Welcome to the "+MAX_NUM_ITEMS+" items or less checkout line"); } public void promptUserForProductEntry(){ System.out.println("Enter item #"+(numItemsPurchased+1)+"'s name and price separated by a space, or enter ""+SENTINEL+"\" to end transaction early"); } public void addNextPurchaseItemFromUser(String itemName, double itemPrice){ itemNames[numItemsPurchased] = itemName; itemPrices[numItemsPurchased] = itemPrice; numItemsPurchased++; } public double getSubtotal(){ double subTotal = 0; for(int i=0; i maxPrice){ maxPrice = itemPrices[i]; } } return maxPrice; } public int getIndexOfMaxPrice(){ int indexOfMax = 0; for(int i=1; i itemPrices[indexOfMax]){ indexOfMax = numItemsPurchased; } } return indexOfMax; } public double getMeanPrice(){ return getSubtotal()/numItemsPurchased; } public double getTaxOnSubtotal(){ return getSubtotal() * TAX_RATE; } public double getTotal(){ return getSubtotal() + getTaxOnSubtotal(); } public void displayReceipt(){ System.out.println("-------------------------------------------------"); System.out.printf("Subtotal: $ %04.2f | # of Items %02d\n", getSubtotal(),numItemsPurchased); System.out.printf(" Tax: $ %05.2f \n",getTaxOnSubtotal()); System.out.printf(" Total: $ %04.2f \n", getTotal()); System.out.println("--------------------THANK YOU--------------------"); } public void displayReceiptStats(){ System.out.println("\n-----------------RECEIPT STATS-----------------"); System.out.printf("Min Item Name: %12s | Price: $ %04.2f\n"+ itemNames[getIndexOfMinPrice()], getMinPrice()); System.out.print("Max Item Name: %12s | Price: $ %04.2f\n", itemNames[getIndexOfMaxPrice()], getMaxPrice()); System.out.printf("Mean price of %02d items purchased: $ %04.2f\n\n", numItemsPurchased, getMeanPrice()); } public void displayAllItemsWithPrices(){ System.out.println("\n---------------RECEIPT BREAKDOWN---------------"); for(int i=0; i

Code:

import java.util.Scanner;
public class ReceiptMaker {

public static final String SENTINEL = "checkout";
public final int MAX_NUM_ITEMS;
public final int TAX_RATE;
private String itemNames;
private double [] itemPrices;
private int numItemsPurchased;

public ReceiptMaker(){
MAX_NUM_ITEMS = 10;
TAX_RATE = .0875; 
itemNames = new String[MAX_NUM_ITEMS];
itemPrices = new double[MIN_NUM_ITEMS];
numItemsPurchased = 0;
}
public ReceiptMaker(int maxNumItems, double taxRate){
if(isValid(maxNumItems)){
MAX_NUM_ITEMS = maxNumItems;
}
else{
MAX_NUM_ITEMS= 10;
}
if(isValid(taxRate)){
TAX_RATE = taxRate;
}
else{
TAX_RATE = .0875;
}
itemNames = new String[MAX_NUM_ITEMS];
itemPrices = new double[MAX_NUM_ITEMS];
numItemsPurchased = 0;
}
public void greetUser(){
System.out.println("Welcome to the "+MAX_NUM_ITEMS+" items or less checkout line");
}
public void promptUserForProductEntry(){
System.out.println("Enter item #"+(numItemsPurchased+1)+"'s name and price separated by a space, or enter ""+SENTINEL+"\" to end transaction early");
}
public void addNextPurchaseItemFromUser(String itemName, double itemPrice){
itemNames[numItemsPurchased] = itemName;
itemPrices[numItemsPurchased] = itemPrice;
numItemsPurchased++;
}
public double getSubtotal(){
double subTotal = 0;
for(int i=0; i<numItemsPurchased; i++){
subTotal += itemPrices[i];
}
return subTotal;
}
public double getMinPrice(){
double minPrice =  Integer.MIN_VALUE;    
for(int i=0; i<numItemsPurchased; i++){
if(itemPrices[i]<minPrice){
minPrice = itemPrices[i];
}
}
return minPrice;
}
public int getIndexOfMinPrice(){
int indexOfMin = 0;
for(int i=1; i<numItemsPurchased; i++){
if(itemPrices[i]< itemPrices[indexOfMin]){
indexOfMin = i;
}
}
return indexOfMin;
}
public double getMaxPrice(){
double maxPrice = Integer.MIN_VALUE;
for(int i=0; i<numItemsPurchased; i++){
if(itemPrices[i] > maxPrice){
maxPrice = itemPrices[i];
}
}
return maxPrice;
}
public int getIndexOfMaxPrice(){
int indexOfMax = 0;
for(int i=1; i<numItemsPurchased; i++){
if(itemPrices[i] > itemPrices[indexOfMax]){
indexOfMax = numItemsPurchased;
}
}
return indexOfMax;
}
public double getMeanPrice(){
return getSubtotal()/numItemsPurchased;
}

public double getTaxOnSubtotal(){
return getSubtotal() * TAX_RATE;
}

public double getTotal(){
return getSubtotal() + getTaxOnSubtotal();
}
public void displayReceipt(){
System.out.println("-------------------------------------------------");
System.out.printf("Subtotal: $ %04.2f    | # of Items %02d\n", getSubtotal(),numItemsPurchased);
System.out.printf("     Tax: $ %05.2f \n",getTaxOnSubtotal());
System.out.printf("   Total: $ %04.2f \n", getTotal());
System.out.println("--------------------THANK YOU--------------------");
}
public void displayReceiptStats(){
System.out.println("\n-----------------RECEIPT STATS-----------------");
System.out.printf("Min Item Name: %12s | Price: $ %04.2f\n"+ itemNames[getIndexOfMinPrice()], getMinPrice());
System.out.print("Max Item Name: %12s | Price: $ %04.2f\n", itemNames[getIndexOfMaxPrice()], getMaxPrice());
System.out.printf("Mean price of %02d items purchased:  $ %04.2f\n\n", numItemsPurchased, getMeanPrice());
}
public void displayAllItemsWithPrices(){
System.out.println("\n---------------RECEIPT BREAKDOWN---------------");
for(int i=0; i<numItemsPurchased; i++){
System.out.printf("Item #%02d   Name: %3s | Price: $ %04.2f\n",(i+1), itemNames[i], itemPrices[i]);
}
}
private double getItemPriceFromUser(Scanner scanner){
//does not handle InputMismatchException
double price = -1;
while( (price = scanner.nextDouble()) < 0 ){
System.out.println("Price \""+price+ "\" cannot be negative.\nReenter price");
}
return price;

}
public void scanCartItems(Scanner scanner){

while(numItemsPurchased < MAX_NUM_ITEMS){
promptUserForProductEntry();
String token1;
double token2=-1;
if(!(token1 = scanner.next()).equalsIgnoreCase(SENTINEL)){
token2 = getItemPriceFromUser(scanner);
addNextPurchaseItemFromUser(token1, token2);
}
else{
break;
}
}
    }

private boolean isValid(int a) {
return (a >= 0);
}
private boolean isValid(double a) {
return (a >= 0);
}
public static void main(String [] args){
Scanner scanner = new Scanner(System.in);
ReceiptMaker rm = new ReceiptMaker();
rm.greetUser();
rm.scanCartItems(scanner);
rm.displayReceipt();
rm.displayReceiptStats();
rm.displayAllItemsWithPrices();
scanner.close();
}   
}

Result:

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

Subtotal: $ 44.98 | # of Items 10

Tax: $ 03.94

Total: $ 48.92

--------------------THANK YOU--------------------

-----------------RECEIPT STATS-----------------

Min Item Name: ice | Price: $ 1.99

Max Item Name: hummus | Price: $ 7.63

Mean price of 10 items purchased: $ 4.50

---------------RECEIPT BREAKDOWN---------------

Item #01 Name: apples | Price: $ 5.32

Item #02 Name: bananas | Price: $ 3.78

Item #03 Name: cantaloupe | Price: $ 2.99

Item #04 Name: donuts | Price: $ 6.55

Item #05 Name: eggs | Price: $ 4.87

Item #06 Name: flour | Price: $ 3.21

Item #07 Name: grapes | Price: $ 5.89

Item #08 Name: hummus | Price: $ 7.63

Item #09 Name: ice | Price: $ 1.99

Item #10 Name: jello | Price: $ 2.75