Java - converting String in array to double

Question

I'm stuck with this pretty silly thing;

I got a textfile like this;

Hello::140.0::Bye

I split it into a string array using;

LS = line.split("::");

Then I try to convert the array values containing the number to a double, like this;

Double number = Double.parseDouble(LS[1]);

But I get the following error message;

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 1

Does anyone have any idea why this doesn't work?

Answer 1

That error has nothing to do with that line of code. Look for somewhere where you're trying to access index 3 of an array. LS in this example should only have indexes 0-2.

Answer 2

I think it's a problem with reading the file. Did you try printing line and also the contents of LS after splitting?

Answer 3

what type is LS?? This code works for me:

public class Test
{

    public static void main(String[] args)
    {
        String s = "Hello::140.0::Bye";
        String[] ls;
        ls = s.split("::");
        System.out.println(ls[1]);
        double d = Double.parseDouble(ls[1]);
        System.out.println(d);
    }
}

Answer 4

I think some lines don't contain data in the specified format. Does the file contains empty lines? In this case the split returns only a single-element array. To find the problem, you could print the line (of the data), on which the error occurs.

Answer 5

You should a compiler, such as Eclipse, which allows you to debug the code dynamically. The issue here is that the Array LS has a size <=1. This could be caused by incorrectly reading the text file as Halo mentioned or as Mnementh mentioned by having a blank line. This will infact occur for any line that does not contain the :: delimiter.

You should perform a check to ensure that the Array LS contains >X entries, especially if you are reading in from a file where entries could vary.

double number = 0.0
if( LS.size() > 3 ){
    number = Double.parseDouble(LS[1]);
}