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Thread: need help with Vending Machine code...

  1. #1
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    Default need help with Vending Machine code...

    guys, I'm working on an assignment for class that involves a vending machine application..... console (no gui) here's the link to project, there are a few things, that I'm having problem implementing like for example I use a "switch case" but I can't get input from the menu in letters, b/c "switch case" only works with int, and also I'm having problem with the "add coins", "buy", "remove coins" methods, I've decided to put all the data into an ArrayList in the for of String, and that's a problem when working with numbers like the price...... could someone take a look at my code and give me some pointers..... here's what I've got so far

    public class VendingMachine {
        String product = ""; 
        String price = ""; 
        String qty = "";
        //constructing vending machine that takes product, price and qty
        public VendingMachine(String product, String price, String qty)
        {
            this.product = product;
            this.price = price;
            this.qty = qty;
        }
     
        //getters
        public String getProduct()
        {
            return product;
        }
        public String getPrice()
        {
            return price;
        }
        public String getQty()
        {
            return qty;
        }
        @Override
        public String toString()
        {
            return product+" @"+price;
        }
    }

    import java.util.*;
    public class VendingMachineSimulation {
        public static void main(String [] args)
        {
            ArrayList<VendingMachine> vMachine = new ArrayList<VendingMachine>();
            Scanner myscan = new Scanner(System.in);
            vMachine.add(new VendingMachine("Pepsi Cola", "1.00", "10"));
            System.out.println("SELECT FROM MENU!");
            System.out.println("1)show product 2)insert coin 3)buy 4)Add product 5)remove coins 6)quit");
            int key = myscan.nextInt();
     
            switch (key)
            {
                case 1: for (int i = 0; i < vMachine.size(); i++)
                        {
                            System.out.println(vMachine.get(i));
                        }break;
                case 2:
                case 3:
                case 4: {
                        System.out.println("Description:");
                        String description = myscan.next();
                        System.out.println("Price:");
                        String price = myscan.next();
                        System.out.println("Quantity:");
                        String qty = myscan.next();
                        vMachine.add(new VendingMachine(description, price, qty));
                        }break;
     
                case 5:
                case 6:
            }
     
        }
    }

    Thanks in advance
    Last edited by mia_tech; March 6th, 2009 at 06:17 PM.


  2. #2
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    Default Switch case implementation problem in Vendor machine code

    well, I've made a few modification, but still, missing somethings

    public class VendingMachine {
        String product = ""; 
        double price = 0.0;
        int qty = 0;
        //constructing vending machine that takes product, price and qty
        public VendingMachine(String product, double price, int qty)
        {
            this.product = product;
            this.price = price;
            this.qty = qty;
        }
     
        //getters
        public String getProduct()
        {
            return product;
        }
        public double getPrice()
        {
            return price;
        }
        public int getQty()
        {
            return qty;
        }
        @Override
        public String toString()
        {
            return product+" @"+price;
        }
     
    }

    import java.util.*;
    public class VendingMachineSimulation {
        public static void main(String [] args)
        {
            ArrayList<VendingMachine> vMachine = new ArrayList<VendingMachine>();
            Scanner myscan = new Scanner(System.in);
            vMachine.add(new VendingMachine("Pepsi Cola", 1.00, 10));
            String key = "";
            do
            {
                System.out.println("SELECT FROM MENU!");
            System.out.println("S)how product I)nsert coin B)uy A)dd product R)emove coins Q)uit");
            key = myscan.next().toUpperCase();
     
     
                if (key.equals("S"))
                {
                    for (int i = 0; i < vMachine.size(); i++)
                            {
                                System.out.println(vMachine.get(i));
                            }break;
                }
                else if(key.equals("I"))
                {
                    //implement Insert coins
                }
                else if(key.equals("B"))
                {
                    //implement add product
                }
                else if(key.equals("A"))
                {
                    //implement add product
                    System.out.println("Description:");
                    String description = myscan.next();
                    System.out.println("Price:");
                    double price = myscan.nextDouble();
                    System.out.println("Quantity:");
                    int qty = myscan.nextInt();
                    vMachine.add(new VendingMachine(description, price, qty));
                }
                else if(key.equals("R"))
                {
                    //implement remove product
                }
                else break;
           }while(!(key.equals("Q")));
        }
    }

  3. #3

    Default Re: need help with Vending Machine code...

    About the switch case, you can use chars, for example:

     key = myscan.next().toUpperCase();
    			char c = key.charAt(0);
    			switch (c) {
    			case 'S':
    				System.out.println("show");
    				break;
    			case 'I':
    				System.out.println("insert");
    				break;
    			case 'B':
    				System.out.println("buy");
    				break;
    			default:
    				break;
    			}

    Or you can use an enumeration (you need some "wrapper") like this:


    key = myscan.next().toUpperCase();
    			Wrapper w = Wrapper.valueOf(key);
    			switch (w.ordinal()) {
    			case 0:
    				System.out.println("show");
    				break;
    			case 1:
    				System.out.println("insert");
    				break;
    			case 2:
    				System.out.println("buy");
    				break;
    			default:
    				break;
    			}
                           .................
                           private enum Wrapper {
    		           S, I, B, A, R;
    	               }

    What else do you need? Not hesitate to ask

  4. #4
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    Default Re: need help with Vending Machine code...

    Hello mia_tech,

    Did leandro help you to fix your problem or is this issue still open?
    Please use [highlight=Java] code [/highlight] tags when posting your code.
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