Question

Ok, I’m trying to make a quick double validator for any JTextField in a program. I would like to pass this to a function which then checks the contents of a field, makes sure it’s a double, then return it as a double to the function.

Here is what I have so far but theTF.getValue() should get the value of the string, not the string itself.

    public double valDouble(String theTF)
    {
            double theDouble;
            try
            {
                theDouble = theTF.getValue();
                return theDouble;
            }
    }

How can I run the getValue() on the contents of the string?

Edit:
Ok, I somewhat screwed up my meaning. I understand the parseDouble, but I left it out on accident here is what I have now:

    public static double valDouble(String theTF)
    {
        double theDouble;
        try
        {
            theDouble = Double.parseDouble(theTF);
        }
        catch(NumberFormatException e3)
        {
            theDouble = 0;
        }
        return theDouble;

    }

My Real issue is theTF represents the name of a TextField. I need the value OF the text field not the value in theTF. I’d like to have this here to, perhaps, highlight the field red etc.

Answer(Thanks Hunter):
The best way was to pass the Object, not sure why I was trying to parse out the value of a string reference.

    public static double vDbl(JTextField theTF)
    {
        double theDouble;
        try
        {
            theDouble = Double.parseDouble(theTF.getText());
        }
        catch(NumberFormatException e3)
        {
            theTF.setText("Invalid");
            return 0;
        }
        return theDouble;
    }

Answer 1

You should really be passing the JTextField object to your method to get the information you are looking for, I don’t even know if it’s possible to get the JTextField object from just its name; maybe with reflection, but for this application reflection seems overly complex.

ex:

public double valDouble(JTextField theTF)
{
        try
        {
            return Double.parseDouble(theTF.getText());
        }
        catch(NumberFormatException nfe)
        {
            System.err.println(nfe.getMessage());
        }
}