Formating Double as a Decimal
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Thread: Formating Double as a Decimal

  1. #1
    Join Date
    Jun 2011
    Posts
    8

    Formating Double as a Decimal

    You guys have been a lot of help so far. I've had to create a program that has an array of 5 items, where one side is an item, the other is a price of that item. I've created everything, but I'm struggling to format the price as a decimal. I have 2 classes written. I am posting the class that has my variables assigned. I think that's where I need to do it. I successfully did this last week with an array where the user entered 5 values, but as each array has 2 values, the method I learned last week formatter.format(x); isn't working. printf wouldn't work either. Anyways, here is my code. I need Price to have a set 2 decimal places on output.

    import java.text.DecimalFormat;
    import java.text.NumberFormat;

    public class Item
    {
    //private instance variables
    private String Name;
    private double price;

    //Create object to format as decimal
    NumberFormat formatter = new DecimalFormat("#0.00");

    public String getName()
    {
    return this.Name;
    }
    public void setItemName(String Name)
    {
    this.Name = Name;
    }

    public double getPrice()
    {
    return this.price;
    }
    public void setPrice(double Name)
    {
    this.price = price;
    }
    public String toString()
    {
    return this.getName() + " $" + this.getPrice();
    }

    //constructor
    public Item(String Name, double price)
    {
    this.Name = Name;
    this.price = price;
    }
    }

    My array looks like: ItemArray[0] = new Item("Donut", 1.50);

    I'm thinknig maybe instead of a double for price I should use a string, but that is only a work around and not a real solution. It'd work for this program, but it doesn't teach me anything.

  2. #2
    Join Date
    Jun 1999
    Location
    SW Missouri
    Posts
    3,450

    Re: Formating Double as a Decimal

    I need Price to have a set 2 decimal places on output
    ....
    formatter.format(x); isn't working.
    Please show the output and desribe what is wrong with it and how you would like it to look
    Norm

  3. #3
    dlorde is offline Elite Member Power Poster
    Join Date
    Aug 1999
    Location
    UK
    Posts
    10,163

    Re: Formating Double as a Decimal

    Quote Originally Posted by jbrintnell View Post
    ... the method I learned last week formatter.format(x); isn't working. printf wouldn't work either.
    The code you posted isn't trying to format the output at all, so it's not surprising it doesn't work properly.

    If you post up the code you tried to do the formatting, we might be able to suggest where it's going wrong.

    Having said that, when I use formatter.format(this.getPrice()) in the toString() method of your Item class, toString() returns a String like this:

    Donut $1.50

    This seems to be what you wanted, so I can't really see what the problem is.

    Testing can show the presence of errors, but not their absence...
    E. Dijkstra
    Please use [CODE]...your code here...[/CODE] tags when posting code. If you get an error, please post the full error message and stack trace, if present.

  4. #4
    Join Date
    Jun 2011
    Posts
    8

    Re: Formating Double as a Decimal

    Thank you, I put my formatter line in the wrong area. That fixed it.

    I had my formatter in the constructor for price. It works as intended this way.

    Thank you

  5. #5
    dlorde is offline Elite Member Power Poster
    Join Date
    Aug 1999
    Location
    UK
    Posts
    10,163

    Re: Formating Double as a Decimal

    Quote Originally Posted by jbrintnell View Post
    I had my formatter in the constructor for price.
    ?? price is a double, it doesn't have a constructor.

    It works as intended this way.
    You haven't posted the new code, so I'll have to take your word for it.

    It is not knowledge, but the act of learning, not possession, but the act of getting there which generates the greatest satisfaction...
    F. Gauss
    Please use [CODE]...your code here...[/CODE] tags when posting code. If you get an error, please post the full error message and stack trace, if present.

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