Converting strings to integers from an array of strings

Question

I'm trying to convert some strings from an array to integers using parseInt(). I am reading in lines from many separate files which look like this:

car,house,548544587,645871266

I have something like the code below:

String [] tokens = line.split(",");
try {
        line = line.trim();
        int a = Integer.parseInt(tokens[2]);
        int b = Integer.parseInt(tokens[3]);
        int c = (b - a);
        System.out.println(c);
        } catch (NumberFormatException e) {
                    System.out.println(e);
            }

But this fails with errors like this, for each line I read in:

java.lang.NumberFormatException: For input string: "548544587"
java.lang.NumberFormatException: For input string: "645871266"

Any idea what I might be missing?

Avinash Raj · Accepted Answer · 2015-04-26 02:08:02Z

5

You need to remove the quotes before splitting. It fails to convert "number" to an actual number because of quotes.

String line = "\"car\",\"house\",\"548544587\",\"645871266\"";
String[] tokens = line.replace("\"", "").split(",");
try {

    int a = Integer.parseInt(tokens[2]);
    int b = Integer.parseInt(tokens[3]);
    int c = (b - a);
    System.out.println(c);
} catch (NumberFormatException e) {
    System.out.println(e);
}

Output:

97326679

edited Apr 26, 2015 at 2:08

answered Apr 26, 2015 at 1:58

Avinash Raj

175k32 gold badges247 silver badges289 bronze badges

Sign up to request clarification or add additional context in comments.

6 Comments

gppanter Over a year ago

Sorry, I had the line example wrong that I read in. It actually doesn't include quotes anywhere. I've updated my original post to show this. (Which is why this is stumping me...)

Avinash Raj Over a year ago

@gppanter i think it's an major update.. did you try this String [] tokens = line.trim().split(","); ?

Avinash Raj Over a year ago

@gppanter why you failed to ask about this on very first?

gppanter Over a year ago

I did try that as well but get the same exceptions thrown. Trimming first doesn't seem to help.

Avinash Raj Over a year ago

trim after splitting int a = Integer.parseInt(tokens[2].trim());

|

Ray Hylock · Accepted Answer · 2015-04-26 03:06:59Z

0

Using a String for line does not produce an error for me, so it must be tied to what you're reading from the file. Also of note, you trim the line, but not each element in tokens. Try trimming each element, e.g., int a = Integer.parseInt(tokens[2].trim());. Also, you might be getting carriage return characters like \n and/or \r, so try to replace those before the split, e.g., String[] tokens = line.replaceAll("\\n", "").replaceAll("\\r", "").split(",");. Hope this helps.

answered Apr 26, 2015 at 3:06

Ray Hylock

1811 silver badge5 bronze badges

2 Comments

gppanter Over a year ago

Hmm, that didn't help either...I thought it would! Interestingly though, if I changed my lines to use 'floats' instead, it worked, insofar as it returned an integer.

Ray Hylock Over a year ago

That is very interesting. What I would do next is check each character in the token, which might lead you to the error.

char[] aa = tokens[2].trim().toCharArray();             for(char c : aa) {                  System.out.print(c + " ");                 System.out.println(Integer.parseInt(""+c));              }

, but that's just what I would do.

Mohan Raj · Accepted Answer · 2015-04-26 03:24:46Z

0

public static void main(String[] args) {
        // TODO Auto-generated method stub
        String line="car,house,548544587,645871266";
        String [] tokens = line.split(",");
        try {
                line = line.trim();             
                int a = Integer.parseInt(tokens[2].trim());
                int b = Integer.parseInt(tokens[3].trim());
                System.out.println(a+ " "+b);
                int c = (b - a);
                System.out.println(c);
                } catch (NumberFormatException e) {
                            System.out.println(e);
                    }

    }
    Output;
    548544587 645871266
    97326679

answered Apr 26, 2015 at 3:24

Mohan Raj

1,1321 gold badge9 silver badges18 bronze badges

Collectives™ on Stack Overflow

Converting strings to integers from an array of strings

3 Answers 3

6 Comments

2 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

6 Comments

2 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related