Homework SourseThe source code for TestVendingMachinejava is showing an err
The source code for TestVendingMachine.java is showing an error when compiling, which has to do with the exception VendingMachineException never thrown in body of corresponding try statement, catch(VendingMachineException vme). I cannot figure out what I am doing wrong and any help would be greatly appreciated. I will provide the three seperate source codes (TestVendingMachine.java, VendingMachineException.java, and VendingMachine.java) that should all work together to recreate the sample output provided.
TestVendingMachine.java
import javax.swing.*;
import java.io.Console;
public class TestVendingMachine
{
public static void main(String[] args) throws VendingMachineException
{
int deposit = 0;
int change = 0;
String choice = null;
Console console = System.console();
if (console != null)
{
// create VendingMachine object
console.format(\"Beginning Vending Machine Simulation.%n%n\");
VendingMachine vm1 = new VendingMachine(); // create a new vending machine object
console.format(\"%s%n%n\",vm1);
deposit = Integer.parseInt(console.readLine(\"Enter money as integer (e.g., 50) or 0 to exit: \"));
while(deposit > 0)
{
try
{
vm1.depositMoney(deposit);
choice = console.readLine(\"Please make a selection (e.g., A1): \");
change = vm1.buyItem(choice);
console.format(\"%nDispensing ...%n%n\");
console.format(\"%s%n\",vm1);
console.format(\"Change returned = %d%n%n\",change);
}
catch(VendingMachineException vme)
{
System.out.println(\"Error: \"+vme.getMessage());
}
deposit = Integer.parseInt(console.readLine(\"\ Enter money as integer (e.g., 50) or 0 to exit: \"));
}
if(vm1.getDeposit() > 0)
console.format(\"%nReturning change: $0.%d%n.\", vm1.getChange());
console.format(\"%nEnd of program.\");
}
else
System.err.println(\"No console.\");
}
}
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();
}
}
VendingMachineException.java
public class VendingMachineException extends Exception
{
public VendingMachineException(String ex)
{
super(ex);
}
}
(Sample output that program should match)
Solution
Since you are not throwing this exception in your VendingMachine class code, you can\'t put in try catch as it will never occur.
For the error messages you need to throw it like: for no console
import javax.swing.*;
import java.io.Console;
public class TestVendingMachine
{
public static void main(String[] args) throws VendingMachineException
{
int deposit = 0;
int change = 0;
String choice = null;
Console console = System.console();
if (console != null)
{
// create VendingMachine object
console.format(\"Beginning Vending Machine Simulation.%n%n\");
VendingMachine vm1 = new VendingMachine(); // create a new vending machine object
console.format(\"%s%n%n\",vm1);
deposit = Integer.parseInt(console.readLine(\"Enter money as integer (e.g., 50) or 0 to exit: \"));
while(deposit > 0)
{
vm1.depositMoney(deposit);
choice = console.readLine(\"Please make a selection (e.g., A1): \");
change = vm1.buyItem(choice);
console.format(\"%nDispensing ...%n%n\");
console.format(\"%s%n\",vm1);
console.format(\"Change returned = %d%n%n\",change);
deposit = Integer.parseInt(console.readLine(\"\ Enter money as integer (e.g., 50) or 0 to exit: \"));
}
if(vm1.getDeposit() > 0)
console.format(\"%nReturning change: $0.%d%n.\", vm1.getChange());
console.format(\"%nEnd of program.\");
}
else
throw new VendingMachineException(\"No Console.\");
}
}
