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?
I think it's a problem with reading the file. Did you try printing line and also the contents of LS after splitting?
public class Test
{
public static void main(String[] args)
{
String s = "140.0::156.33::155.89";
String[] ls;
ls = s.split("::");
for(int i=0;i<=2;i++)
{
//System.out.println(ls[i]);
double d = Double.parseDouble(ls[i]);
System.out.println(d);
}
}
}
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.
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.
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);
}
}
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]);
}
import java.util.ArrayList;
import java.util.Arrays;
public class StringToDoubles {
/**
* @param args
*/
public static void main(String[] args)
{
String CommaSeparated = "22.3 , 24.5, 44.3";
java.util.List<String> items = Arrays.asList(CommaSeparated.split("\\s*,\\s*"));
java.util.List<Double> out = new ArrayList<Double>();
for(int i=0; i < items.size();i++)
{
double d = Double.parseDouble(items.get(i));
System.out.println(d);
out.add(new Double(d));
}
}
}
//Using streams provides a neat solution.
// this will give you {1.3, 3.5, 98.342}
String input = "1.3::3.5::98.342";
double[] arr = Arrays.stream(input.split("::")).mapToDouble(Double::parseDouble).toArray();
LS?