java.lang.NumberFormatException: For input string: "22"

Question

public void loadFromFile(String filename) {
    File file = new File(filename);
    BufferedReader br;

    try {
        br = new BufferedReader(new FileReader(file));
        numberOfAttributes = Integer.parseInt(br.readLine());
    } 
    ...
}

Above is my program: I am trying to read from a txt file where the first line is the number 22 and nothing more. I don't know why the program gives me an exception.

Answer 1

Try stripping any whitespace from the string:

        numberOfAttributes = Integer.parseInt(br.readLine().trim());