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BoltedDown

02-15-2005 10:21 PM

[JAVA] Need to add 'double' to hashtable

Here is what i'm working with:

Code:

public class Menu1DB

{

    public static Hashtable loadMenu()

        {

        int i = 0;

        String line;

        Hashtable hshProdDesc = new Hashtable();

        Hashtable hshProdPrice = new Hashtable();

        StringTokenizer strings;

                try

                {

                        BufferedReader file =

                        new BufferedReader(new FileReader("menu.txt"));

                        // priming read

                        line = file.readLine();

                        //while ((line = file.readLine()) != null)

                        while (line != null)

                        {

                        strings = new StringTokenizer(line, ",");

                        String strProdID = strings.nextToken();

                        String strProdDesc = strings.nextToken();

                        String strProdPrice = strings.nextToken();

                        double dblProdPrice = Double.valueOf(strProdPrice).doubleValue();

                        hshProdDesc.put(strProdID,strProdDesc);

//-->>                     hshProdPrice.put(strProdID,dblProdPrice);

Apparently '.put' only allows (Object, Object) so i'm stuck. I need to do (Object, double).

Thanks!

-BD

a-j	02-15-2005 11:35 PM

The Double class is derived from object, you need to use that since Java 1.4- doesn't support putting primitives inside hashtables. Something like

Code:

String strProdPrice = strings.nextToken();

Double dblProdPrice = Double.valueOf(strProdPrice);

hshProdDesc.put(strProdID,dblProdDesc);

madcow

02-16-2005 05:20 PM

a-j hit the nail on the head there. On a side note, it looks like you are adding both the product Id and the price under the same Hash table key. This won't work. Each item in a hash table needs to have a different key. Maybe you should make a "Product" class that holds all the information about a product (Description, Id and Price from what I can see) and store that in your Hash table.

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