Integer from StringBuilder

Question

I have a text file that contains one number, and I'm loading it using this method:

BufferedReader br = null;
    try {
        br = new BufferedReader(new FileReader("res/sheet.cfg"));
    } catch (FileNotFoundException e1) {
        e1.printStackTrace();
    }
    try {
        StringBuilder sb = new StringBuilder();
        String line = br.readLine();

        while (line != null) {
            sb.append(line);
            sb.append('\n');
            line = br.readLine();
        }
        textureSize = Integer.valueOf(sb.toString());
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        try {
            br.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

This line:

textureSize = Integer.valueOf(sb.toString());

Throws this error:

Exception in thread "main" java.lang.NumberFormatException: For input string: "16"

I understand what the issue is, but how do I fix it? Do I need to create a temporary string to remove the quotations and then get the value of that string and pass it into textureSize?

Evgeniy Dorofeev · Accepted Answer · 2013-12-30 05:03:36Z

5

This is the problem

sb.append('\n');

dont do it. Integer.valueOf accepts only digits in the input string, new line is not allowed

edited Dec 30, 2013 at 5:03

answered Dec 30, 2013 at 4:41

Evgeniy Dorofeev

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1 Comment

user1650305 Over a year ago

Thank you! Works perfectly! So Java automatically adds quotations to new lines?

Sergey Kalinichenko · Accepted Answer · 2013-12-30 04:43:51Z

5

Integer.valueOf does not allow trailing or leading whitespace characters. Trimming the string before parsing should fix the problem:

textureSize = Integer.valueOf(sb.toString().trim());

Better yet, remove code that adds newline in the first place.

answered Dec 30, 2013 at 4:43

Sergey Kalinichenko

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