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javaparsingparseint

Number Format Exception While Reading A File

Getting the following error while reading the contents of the file, I think that my code is not converting the it into integer rightly following are the errors:

Exception in thread "main" java.lang.NumberFormatException: For input string: "3 "
    at java.lang.NumberFormatException.forInputString(Unknown Source)
    at java.lang.Integer.parseInt(Unknown Source)
    at java.lang.Integer.parseInt(Unknown Source)
    at Program.main(Program.java:192)

and here is the code: 

    FileReader fin = new FileReader("task.txt");
    BufferedReader sr = new BufferedReader (fin);
    int count = 0;
    int number = Integer.parseInt(sr.readLine());
Solution

  • You are trying to parse a String that contains a space and a digit - "3 ".

    You should eliminate the spaces before parsing to int :

     int number = Integer.parseInt(sr.readLine().trim());