NumberFormatException

[Manfizy]

i am trying to store a value to a file. this value is very small and i format it using DecimalFormat class. For instance my value is

1.967069154774973E-9

and i format it using this constructor

DecimalFormat myVal = new DecimalFormat("0.0000E0");

The formatted value is stored in a file
When i try to retrieve this value i get the NumberFormatException:(

How can i deal with this kind of a problem??

[RamyaSivakanth]

Hi Manfizy,
Send the complete code.This single line will not help to give the solution.
-Regards
Ramya

[Eranga]

i am trying to store a value to a file. this value is very small and i format it using DecimalFormat class. For instance my value is and i format it using this constructor
The formatted value is stored in a file
When i try to retrieve this value i get the NumberFormatException:(

How can i deal with this kind of a problem??

Ok, once you write the value, open the file and see anything wrong with the formating first.

[Manfizy]

i am trying to store a value to a file. this value is very small and i format it using DecimalFormat class. For instance my value is
Quote:
1.967069154774973E-9

and i format it using this constructor
Quote:
DecimalFormat myVal = new DecimalFormat("0.0000E0");

The formatted value is stored in a file
When i try to retrieve this value i get the NumberFormatException

Excuse me pple, i would like to make a correction here. The formatted value is stored in a table and not a file as i had stated earlier. i get the values in a file, format them and display then in a certain table. It displays on the table the way i want it to.
I get the error when i try to access the values in the table

Below is my code for that section :

public void ConcentrationProfiles() {

    int k;
    int rCount = Temp.getRowCount();
     //Loop to initialize Array size
 for ( k = 0; k < rCount; k++){
     String power_t = (String)Temp.getValueAt(k,1);
        if (power_t == null){
            break;   }
          }
  LOOP = new double[k];//Array size
 
 final XYSeries series2 = new XYSeries("Iodine Conc.");
    
 //Iodine Concentration profile

double x_axis_val,y_axis_val;
for (k = 0; k < LOOP.length; k++) {
   int time_t = (Integer)Temp.getValueAt(k,0);
       x_axis_val = time_t;
       
   //double iodConc =(Double)Temp.getValueAt(k, 2);
    String iodConc =(String)Temp.getValueAt(k, 2);
    double y_value =Double.valueOf(iodConc.trim()).doubleValue();

     y_axis_val =y_value;

series2.add(x_axis_val, y_axis_val);
}
final XYSeriesCollection dataset = new XYSeriesCollection();
//dataset.addSeries(series1);
dataset.addSeries(series2);

chart  = ChartFactory.createXYLineChart("Xenon & Iodine Concentration ",
     "Time(Mins)", "Xenon & Iod (E-09)",(XYSeriesCollection) dataset, PlotOrientation.VERTICAL, true, true, false);
    ChartPanel frame1 = new ChartPanel(chart,true,true,true,true,true);
   frame1.addMouseListener(frame1);//ddChartMouseListener(chartMouseMoved(chartMouseEvent event));

ConcentrationGraph.setLayout(new BorderLayout());
 ConcentrationGraph.add(frame1);
  ConcentrationGraph.validate();
}

here is the problem

String iodConc =(String)Temp.getValueAt(k, 2);
double y_value =Double.valueOf(iodConc.trim()).doubleValue();

[RamyaSivakanth]

Manfizy,
In the below lines what u mentioned

String iodConc =(String)Temp.getValueAt(k, 2);
double y_value =Double.valueOf(iodConc.trim()).doubleValue();

Have u tried to print iodConc.Might be "" or invalid number value .Check it once.Then only it will throw "NumberFormatException"

-Regards
Ramya

[Manfizy]

Hi Ramya,
it prints the value as it is displayed in the table

Grapph value --->5,8333E-9

[RamyaSivakanth]

Manfizy,
Double.value expects pure numbers.It can't identify exponents.Use BigDecimal or Decimalformat.

-Regards
Ramya

[RamyaSivakanth]

Use like this
String iodConc =(String)Temp.getValueAt(k, 2);
double y_value =new BigDecimal(iodConc.trim()).doubleValue()

[Manfizy]

:mad:Still getting NumberFormatException

[RamyaSivakanth]

Might be "," is there .Check it once

[Manfizy]

";" is in place and again am using an IDE that can tell me when something is missing:confused:

[Mr.Beans]

I believe Ramya was indicating that there might be a ',' in the number itself, not in your source code. ie 1,000.625

I believe the DecimalFormat class can handle that though.

Grapph value --->5,8333E-9

That statement is a little ambiguous. Is that "5,8333E-9" the value of iodConc?

Are the numbers supposed to have decimals? The one above doesn't.

[Manfizy]

@ mr. Beans, yep the number is supposed to have decimal places and that´s why i formatted it. am using OS that is in German and MAYBE that is why the decimal point automatically appear as ","
This appears after formatting and am tempted to thinks its somekind of locale o something:p

[Tolls]

   //double iodConc =(Double)Temp.getValueAt(k, 2);
    String iodConc =(String)Temp.getValueAt(k, 2);
    double y_value =Double.valueOf(iodConc.trim()).doubleValue();

here is the problem

You're formatting the values from the file using DecimalFormat, in a specific format as given in your OP. You are then using valueOf() to convert this format into a double. Unless the format you have used is valid for valueOf() it won't work. Why don't you use the DecimalFormat String you've defined and parse iodConc?

In general, if you do something using one technique, you should use the reverse of that technique to get back to where you started.