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Thread: I need help with my Business Application

  1. #1
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    Default I need help with my Business Application

    So this application gets input from the user and converts it into a string. It then uses various methods to set instance variables of this class and ends up printing those classes to display information to the user about that products.

    package javaapplication5;
    import java.text.NumberFormat;
    import java.util.Scanner;
     
    public class Product
    {
        private String product;
        private String description;
        private double price;
     
        public Product()
        {
            String product = "";
            String description = "";
            double price = 0.0;
        }
     
     
        public static void main(String[] args)
        {
            Scanner sc = new Scanner(System.in);
            Product productObject = new Product();
     
            System.out.println("Enter a product for information. Choose either Java or C++");
            String productName = sc.next();
            productObject.setProductInfo(productName);
            System.out.println("Prduct: " + productObject.getProduct() + " Description: " + productObject.getDescription() + " Price " + productObject.getPrice());
     
     
        public void setProductInfo(String product)
        {
            Product productObject = new Product();
            String productName = productObject.getProduct();
            if(product.equalsIgnoreCase("java"))
            {
                productObject.setProduct("Murach's Java Programing");
                productObject.setDescription("Learn java with this fabulous book");
                productObject.setPrice(49.95);
            }
            else if(product.equalsIgnoreCase("C++"))
            {
                productObject.setProduct("Murach's C++ Programing");
                productObject.setDescription("Learn C++ with this fabulous book");
                productObject.setPrice(39.95);
            }
            else
                productObject.setProduct("Unkown");
        }
     
     
        public String getProduct() 
        {
            return product;
        }
     
     
        public void setProduct(String product) 
        {
            this.product = product;
        }
     
     
        public String getDescription() 
        {
     
            return description;
        }
     
     
        public void setDescription(String description)
        {
            this.description = description;
        }
     
     
        public double getPrice()
        {
            return price;
        }
     
     
        public void setPrice(double price) 
        {
            this.price = price;
        }
    }
    I am getting a logical error. My output is this:

    Enter a product for information. Choose either Java or C++
    java
    Prduct: null Description: null Price 0.0
    Last edited by cooljava50544; April 24th, 2014 at 12:48 PM. Reason: Fixed the old bug, found a new one. Fixed code tags


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: I need help with my Business Application

    Please fix the code tags. The ending one is missing.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: I need help with my Business Application

    Done.

  4. #4
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    Default Re: I need help with my Business Application

    In your setProductInfo() method, you are creating a new Product object and setting those values, instead of modifying the "this" Product (the "this" Product is the instance of Product which the method was called on).
    What I'm saying is: in the setProductInfo() method, get rid of this:
    Product productObject = new Product();
    String productName = productObject.getProduct();
    and every time you do something like this:
    productObject.setProduct("Murach's Java Programing");
    Instead do this:
    setProduct("Murach's Java Programing");
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  5. #5
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    Default Re: I need help with my Business Application

    Quote Originally Posted by aussiemcgr View Post
    In your setProductInfo() method, you are creating a new Product object and setting those values, instead of modifying the "this" Product (the "this" Product is the instance of Product which the method was called on).
    What I'm saying is: in the setProductInfo() method, get rid of this:
    Product productObject = new Product();
    String productName = productObject.getProduct();
    and every time you do something like this:
    productObject.setProduct("Murach's Java Programing");
    Instead do this:
    setProduct("Murach's Java Programing");
    Thanks!

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