Create a VendingMachineException class defined inVendingMach

Create a VendingMachineException class defined inVendingMachineException.java. This class has a single constructor which takes a String, msg, and passes it to the parent Exception class. It also should contain a private String, error, with the value of \"***Error: Vending Machine–\"; and override the getMessage() method to prepend error to the message from the parent class and return to the caller.

I have provided you with a VendingMachine class, defined in VendingMachine.java, which you need to modify to remove all output and to use the VendingMachineException class.

When throwing an exception, pass the appropriate text message to display the reason for the error. When the message indicates data from a variable, it uses the variable(s)–do not simply type the amount, selection, or price as text. Review string concatenation, if necessary. Neither of the above classes should do any input or output.

Throw a VendingMachineException under the following conditions: (A) in the buyItem() method; if no money has been deposited, throw an error message containing the user selection. (B) in the buyItem() method; if the item selected is not valid, throw an error message containing the user selection. (C) in the buyItem() method; if the selected item is out of stock, throw an error message containing the selected item description and price. (D) in the buyItem() method; if the money deposited is insufficient for the item cost, throw an error message containing the selected item description, price, and amount deposited so far by the user.

(Provided Code) VendingMachine.java

import java.util.Random;
import java.util.regex.*;

public class VendingMachine
{
   // soft drinks candy bars snacks
   private String[][] items = { {\"Pepsi\",    \"Snickers\",    \"Potato Chips\"},
                                {\"Diet Pepsi\", \"Resse\'s Cup\", \"Ruffles\"},
                                {\"Dr. Pepper\", \"M&M chocolate\",\"Fritos\"},
                                {\"Diet Dr. P\", \"Peanut M&Ms\", \"Doritos\"},
                                {\"Sprite\",      \"Twisters\",    \"Almonds\"},
                                {\"Diet Sprite\",\"Hershey\'s\", \"Peanuts\"} };

   private int[][] prices = { {75,65,30},
                              {80,60,35},
                              {70,55,40},
                              {75,60,45},
                              {60,45,50},
                              {65,40,35} };

   private int[][] quantity = { {3,1,0},
                                {4,6,5},
                                {7,5,4},
                                {5,0,5},
                                {0,4,0},
                                {6,4,3} };

   private int depositedAmt = 0;
   private boolean haveValidSelection = false;
   private int selectedRow = 0;
   private char selectedCol = \'A\';

   // default constructor
   public VendingMachine()
   {
   }

   public int buyItem(String selection)
   {
      Pattern validChars = Pattern.compile(\"[^A-Ca-c1-6]+\");
      Matcher m1 = validChars.matcher(selection);

      Pattern selectionRange = Pattern.compile(\"[1-6]+\");
      Matcher m2;
      boolean illegal = false;
      int change = -1;

      if(depositedAmt > 0)
      {
         if(selection.length() != 2)
            illegal = true;

if(!illegal)
illegal = m1.find();

         if(!illegal)
            if( Character.getNumericValue(selection.charAt(1)) < 1)
               illegal = true;

         m2 = selectionRange.matcher(selection.substring(0,1));
         if(!illegal)
            illegal = m2.find();

haveValidSelection = !illegal;

         if(haveValidSelection)
         {
            selectedRow = Character.getNumericValue(selection.charAt(1) - 1);
            selectedCol = Character.toUpperCase(selection.charAt(0)); // allows for upper- or lowercase entry
            int col = selectedCol - 65;

            if(quantity[selectedRow][col] > 0)
               if( depositedAmt >= prices[selectedRow][col])
               {
                  depositedAmt -= prices[selectedRow][col];
                  --quantity[selectedRow][col];
                  change = getChange();
               }
               else
                  System.out.print(String.format(\"Insufficient funds for item: %s%nCost: $0.%d, Deposited: $%.2f\",
                                                items[selectedRow][col], prices[selectedRow][col], getDeposit()/100.0));
            else
                  System.out.print(String.format(\"Out of stock on this item: %s%nCost: $0.%d\",
                                                items[selectedRow][col], prices[selectedRow][col]));
         }
         else
            System.out.print(\"Invalid item selection: \"+selection);
      }
      else
         System.out.print(\"Please enter proper funds before making selection: \"+selection);

return change;
}

   public void depositMoney(int payment)
   {
      if(payment > 0)
         depositedAmt += payment;
   }

   public int getChange()
   {
      int returned = depositedAmt;
      depositedAmt = 0;
      return returned;
   }

   public int getDeposit()
   {
      return depositedAmt;
   }

   // returns String representation of object
   public String toString()
   {
      // display items, quantity on hand, and prices
      StringBuffer display = new StringBuffer();

      // holds display contents
      display.append(\" Price A (in stock)    Price B (in stock)      Price C (in stock)\ \");
      display.append(\"1 $0.\"+prices[0][0]+\" Pepsi(\"+quantity[0][0]+\")        $0.\"
                     +prices[0][1]       +\" Snickers(\"+quantity[0][1]
                     +\")       $0.\"+prices[0][2]+\" Potato Chips(\"+quantity[0][2]+\")\ \");
      display.append(\"2 $0.\"+prices[1][0]+\" Diet Pepsi(\"+quantity[1][0]
                     +\")   $0.\"+prices[1][1]+\" Resse\'s Cup(\"+quantity[1][1]
                     +\")    $0.\"+prices[1][2]+\" Ruffles(\"+quantity[1][2]+\")\ \");
      display.append(\"3 $0.\"+prices[2][0]+\" Dr. Pepper(\"+quantity[2][0]
                     +\")   $0.\"+prices[2][1]+\" M&Ms (reg)(\"+quantity[2][1]
                     +\")     $0.\"+prices[2][2]+\" Fritos(\"+quantity[2][2]+\")\ \");
      display.append(\"4 $0.\"+prices[3][0]+\" Diet Dr. P(\"+quantity[3][0]
                     +\")   $0.\"+prices[3][1]+\" Peanut M&Ms(\"+quantity[3][1]
                     +\")    $0.\"+prices[3][2]+\" Doritos(\"+quantity[3][2]+\")\ \");
      display.append(\"5 $0.\"+prices[4][0]+\" Sprite(\"+quantity[4][0]
                     +\")       $0.\"+prices[4][1]+\" Twisters(\"+quantity[4][1]
                     +\")       $0.\"+prices[4][2]+\" Almonds(\"+quantity[4][2]+\")\ \");
      display.append(\"6 $0.\"+prices[5][0]+\" Diet Sprite(\"+quantity[5][0]
                     +\") $0.\"+prices[5][1]+\" Hershey\'s(\"+quantity[5][1]
                     +\")      $0.\"+prices[5][2]+\" Peanuts(\"+quantity[5][2]+\")\ \");

return display.toString();
}
}