Question

For Project 02 you’re going to take starter code I’m providing (See in BlackBoard under Projects->Project 02). The zip file contains a P02.java, a HelperClass.java, and an enumeration under Money.java. The only coding you’ll do will be in P02.java. I’ve already provided you with the menu and switch as well as all the methods you’ll need stubbed out. Your assignment is to take the program and complete it without adding any more methods but merely adding code to those stubbed out methods. I’ve coded the switch statement that will call those methods. You only need to put code in these methods for add, remove, view, and empty.

You will use the helper class to get all input from the user. If an int is needed use HelperClass.getIntegerInput(prompt) If a double is then use HelperClass.getIDoubleInput(prompt) If a String is required use HelperClass.getStringInput(prompt), and so on.

Menu Choice 1: When menu choice 1 is selected you will display all possible denominations with the numerical values in a list and ask the user what numerical value they would like to put in the wallet (-1 to exit back to the main menu).

Ask them to enter the amount and you will check if they entered -1 which will exit back to the main menu. If they didn’t enter -1 then check against the enumeration Money to see if that is a valid amount. If it is a valid amount then add that amount to the Vector of doubles simulating putting the money in the virtual wallet.

You will keep prompting them to put money in the wallet until they enter a -1. I suggest using a do while until -1 is entered. Remember that the user will be entering a double so check for -1.0 in your do while.

Menu Choice 2: Remove money from wallet. When this option is selected you will display all the money in the wallet and ask the user to enter a numerical amount for a value in the wallet. You can group the amounts and even sort them if you like. I suggest you code displayMoneyInWallet() first and call this from this method to show the user what they have in the wallet. Allow the user to keep removing money until either the wallet is empty or -1 is entered. Each time they enter something show them what’s in the wallet again and ask them to enter another amount or -1.

Each time you will check against the enumeration to first make sure it’s a valid amount. If it is then you will check the vector (wallet) to make sure it is in there, removing the first instance of that value.

Menu Choice 3: Display Money in Wallet. When display money is selected display the contents of the wallet to the screen. The output doesn’t need to be sorted but it does need to be grouped. Sorting would be cool though. Just display what’s in the wallet with the name of the denomination as well as the total in the wallet. You’ll need to group the denominations. I suggest just creating variables for each denomination, setting it initially to zero, like penny, nickel, dime…. And as you loop through the wallet increment these values displaying only the denominations you have in the wallet.

Output could be something like: 10 Penny 2 Quarter 2 Five 1 Ten Total: $ 20.60 That’s all this method does.

Menu Choice 4: When option 4 is selected from emptyWallet() you will call displayWallet to show the user what was in their wallet and then clear out the Vector (wallet).

Menu Choice 5: When 5 is selected the program exits. I’ve already coded this for you.

THIS IS MY CODE ALL I NEED IS THE SECTIONS TO BE FILLED IN AND CODE SHOULD RUN.

package p02;

import static java.lang.System.*;
import java.io.*;
import java.util.*;

public class P02 {
  
public static Vector<Double> wallet=new Vector<Double>();
  
public static void addMoneyToWallet(){
  
}
  
public static void removeMoneyFromWallet(){
  
}
  
public static void displayMoneyInWallet(){
  
}
  
public static void emptyWallet(){
  
}
  
public static void main(String[] args){
int choice=0;
String menu="Wallet Application:\n\n" +
"1) Add Money to Wallet\n" +
"2) Remove Money from Wallet\n" +
"3) Display Money in Wallet\n" +
"4) Empty Wallet\n" +
"5) Exit\n" +   
"Please enter a selection->";
do {
choice=HelperClass.getIntegerInput(menu);
switch(choice){
case 1:
addMoneyToWallet();
break;
case 2:
removeMoneyFromWallet();
break;
case 3:
displayMoneyInWallet();
break;
case 4:
emptyWallet();
break;
case 5:
out.println("Okay, goodbye!!!");
break;
default:
out.println("That is not a valid choice.../nPlease try again!!!\n\n");
break;
}
}while(choice!=5);   
}
  
}

Answer 1

1. addMoneyToWallet()

public static void addMoneyToWallet()

{

Money[] denominations = Money.values();

boolean isValidDenom = false;

while(true)

{

// show all the denominations.

for(Money denomination: denominations)

{

System.out.println(denomination.getDenom());

}

double moneyToBeAdded = HelperClass.getDoubleInput("Select any of these denominations by entering their value or -1 to go back to main menu : ");

isValidDenom = false;

// if the user doesn't select -1

if(moneyToBeAdded != -1.0)

{

for(Money denomination : denominations)

{

if(denomination.getDenom() == moneyToBeAdded)

{

isValidDenom = true;

}

}

// check if it is valid in the first place.

if(isValidDenom)

{

// then add to the wallet.

wallet.add(moneyToBeAdded);

}

else

{

System.out.println("That's not a valid denomination or -1 to exit: ");

continue;

}

}

// return if -1 is entered.

else return;

}

}

removeMoneyFromWallet()

public static void removeMoneyFromWallet()

{

double totalMoney = 0;

for(double money : wallet)

{

totalMoney += money;

}

while(totalMoney != 0)

{

// first display the money in the wallet.

displayMoneyInWallet();

double moneyToBeRemoved = HelperClass.getDoubleInput("Enter any denomination present in your wallet or -1 to go back to main menu: ");

// if the user doesn't select -1.

if(moneyToBeRemoved != -1.0)

{

// remove the money

wallet.remove(moneyToBeRemoved);

totalMoney -= moneyToBeRemoved;

}

else return;

} // give the option to remove until there is no money in the wallet.

}

displayMoneyInWallet()

public static void displayMoneyInWallet()

{

int penny=0;

int nickel= 0;

int dime= 0;

int quarter= 0;

int half= 0;

int one= 0;

int two= 0;

int five= 0;

int ten= 0;

int twenty= 0;

int fifty= 0;

int hundred = 0;

double totalMoney = 0;

// loop through the wallet and count all the denominations.

for(double money: wallet)

{

if(money == .01) penny++;

else if(money == .05) nickel++;

else if(money == .10) dime++;

else if(money == .25) quarter++;

else if(money == .50) half++;

else if(money == 1.00) one++;

else if(money == 2.00) two++;

else if(money == 5.00) five++;

else if(money == 10.00) ten++;

else if(money == 20.00) twenty++;

else if(money == 50.00) fifty++;

else if(money == 100.00) hundred++;

// increment the total money.

totalMoney += money;

}

System.out.println("Money in wallet");

if(penny != 0) System.out.println(penny + " penny");

if(nickel != 0) System.out.println(nickel + " nickel");

if(dime != 0) System.out.println(dime + " dime");

if(quarter != 0) System.out.println(quarter + " quarter");

if(half != 0) System.out.println(half + " half");

if(one != 0) System.out.println(one + " one");

if(two != 0) System.out.println(two + " two");

if(five != 0) System.out.println(five + " five");

if(ten != 0) System.out.println(ten + " ten");

if(fifty != 0) System.out.println(fifty + " fifty");

if(twenty != 0) System.out.println(twenty + " twenty");

if(hundred != 0) System.out.println(hundred + " hundred");

System.out.println("Total : $ " + totalMoney);

}

emptyWallet()

public static void emptyWallet()

{

displayMoneyInWallet();

wallet.clear();

}