Hi,

My program reads in a text file which has strict format. Briefly, my
program looks like:

BufferedReader inputStream = new BufferedReader(new
FileReader("input.txt"));

String line1 = inputStream.readLine();
String line2 = inputStream.readLine();

double value = Double.valueOf(line1.substring(0,25).trim());
double valueB = Double.valueOf(line1.substring(30,45).trim());
...

The number in input.txt located in the first line in the position from
1st space to 25th space will be assigned to the variable value, number
between position 31 and 45 will be assigned to valueB.

My problem is: with the above code, in input.txt first line, if between
position 1 to 25 is empty, I "wish" value be assigned automatically as
zero. But the program fails, with error saying something like Wrong
Format Exception "". Similarly, if position between 31 and 45 is empty
in the first line of input.txt, program will also fail.

Could you help me to modify my program to take care such a case? For
other reasons unspecified here, I cannot use String Tokenizer or Pattern
split method. I want to stick to the code above with some minor changes.

Thank you very much.