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Thread: Why is my code storing input data in all three of my product objects?

  1. #1
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    Default Why is my code storing input data in all three of my product objects?

    Hello,

    I have been trying to figure out this problem for the past day and yet every tweak I make I seem to mess it up even more. I should add that I am relatively new to java and programming in general.

    My problem is that in my program, I have the user input data for one of three product objects, however when I read the data for all three objects, the same data is stored in all of them.
    Anyway this is the method from the Interface class:

    private void readInput() // the only method in the program that accepts product data from the user
        {
            Store matesStore = new Store();
            String name;
            int demandRate, productChoice;
            double setupCost, unitCost, inventoryCost, sellingPrice;
     
            Scanner console = new Scanner(System.in); 
            System.out.println("Please choose a product: (1), (2), (3)"); //this is where the user chooses which product they wish to enter data for.
            productChoice = console.nextInt();
            System.out.println("Please enter the product's name: ");
            name = console.next();   
            Store.check(name); 
            System.out.println("Please enter the product's demand rate: ");
            demandRate = console.nextInt();                         
            System.out.println("Please enter the product's setup cost: ");
            setupCost = console.nextDouble();
            System.out.println("Please enter the product's unit cost: ");
            unitCost = console.nextDouble();
            System.out.println("Please enter the product's inventory cost: ");
            inventoryCost = console.nextDouble();
            System.out.println("Please enter the product's selling price: ");
            sellingPrice = console.nextDouble();
            matesStore.addData(productChoice, name, demandRate, setupCost, unitCost, inventoryCost, sellingPrice); 
            // uses the addData() method in the Store class to set the data in the created Store object matesStore
            //continueOption();  //is meant to ask the user whether they are ready to continue but I still have some problems with it
            showInterface();
            chooseOption();
        }

    And here is the method from the Store class:

    public static void addData(int option, String newName, int newDemand, double newSetup, double newUnit, double newInventory, double newPrice) 
        //sets the product data for a particular product
        {
            if (option==1) setData(product1, newName, newDemand, newSetup, newUnit, newInventory, newPrice);
            else if (option==2) setData(product2, newName, newDemand, newSetup, newUnit, newInventory, newPrice);
            else /*(option==3)*/ setData(product3, newName, newDemand, newSetup, newUnit, newInventory, newPrice);      
        }
        private static void setData(Product product, String name, int demandRate, double setupCost, double unitCost, double inventoryCost, double sellingPrice)
        //uses the Product class' mutator methods to set the data
        {        
            Product.setName(name);
            Product.setDemand(demandRate);
            Product.setSetup(setupCost);
            Product.setUnit(unitCost);
            Product.setInventory(inventoryCost);
            Product.setPrice(sellingPrice);        
        }

    If there's any additional info you need to help, I'm happy to provide it. Any help would be greatly appreciated.

    Cheers

    Edit: The problem I had was with static variables and methods. Any one having similar problems should read about the difference between static and instance variables and methods.
    Last edited by MrPigeon; May 8th, 2014 at 12:48 AM. Reason: Solved on my own


  2. #2
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    Default Re: Why is my code storing input data in all three of my product objects?

    Thanks for providing guidance for others with similar problems.

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