为什么无法使用java中的方法Integer.valueOf（）解析从文本中读取的实际数字字符串？

Question

Why an actual number string read from a text can't be parsed with method Integer.valueOf() in java?

Exception :

Exception in thread "main" java.lang.NumberFormatException: For input string: "11127"
    at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
    at java.lang.Integer.parseInt(Integer.java:580)
    at java.lang.Integer.valueOf(Integer.java:766)
    at sharingBike.ReadTxt.readRecord(ReadTxt.java:91)
    at sharingBike.ReadTxt.main(ReadTxt.java:17)

This is my code

        File fileView = new File(filePath);

        BufferedReader in = new BufferedReader(new InputStreamReader(new FileInputStream(fileView), "UTF-8"));

        String line;

        int count = 0;
        while ((line = in.readLine()) != null) {
            String[] lins = line.split(";");

            int value;
            value = Integer.valueOf(lins[0]);}

Answer 1

Here is the content of your string:

System.out.println(Arrays.toString("11127".getBytes()));

which outputs:

[-17, -69, -65, 49, 49, 49, 50, 55]

The first three bytes are a UTF-8 BOM .

You can fix it by removing non-digits from the string first (and use parseInt to return an int instead of an Integer ):

int value = Integer.parseInt(lins[0].replaceAll("\\D", "");