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Thread: Problem in BufferedReader

  1. #1
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    Default Problem in BufferedReader

    This was given as a quiz to us by our instructor. She gave me perfect score for this, but when I actually run the program on my PC it says "cannot resolve symbol". What does it means? How could I fix it? Can anyone please help me? Thank you very much!


    import java.io.*;
    public class BufferedReader
    {
        public static void main (String[]args)
        {
            BufferedReader dataIn = new BufferedReader (new InputStreamReader(System.in));
     
            String num;
     
            try
            {
                num = dataIn.readLine();
                int number1 = Integer.parseInt(num);
                num = dataIn.readLine();
                int number2 = integer.parseInt(num);
            }
     
            catch (IOException e)
            {
                System.out.println("Error!");
            }        
     
            int sum = number1 + number2;
            System.out.println("The Sum is " +sum);
        }    
    }

    EDIT:

    By the way, I'm using NetBeans IDE 5.0


  2. #2
    Senile Half-Wit Freaky Chris's Avatar
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    Default Re: Problem in BufferedReader

    Firstly you named your class BufferedReader, so when you do new BufferedReader, Java is looking for the contructor within your class not the BufferedReader default library. Try renaming to something like "BufferedReaderExample".

    Secondly, you define two integers within a try statement, and then attempt to use them outside of the try statement, but this is not possible due to scoping laws.

    Regards,
    Chris
    chris[at]javaprogrammingforums[dot]com

    Prifysgol Bangor University, North Wales

  3. #3
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    Default Re: Problem in BufferedReader

    Thank you for the reply, sir Chris. I've already renamed my class. Now the last two lines encountered the same error. I'm sorry, I really don't know about this. I just followed the instructions of my teacher.

      int sum = number1 + number2;
     System.out.println("The Sum is " +sum);

    It says:
    C:\Documents and Settings\shamed\javaprogs\src\BuffReadwww.java:35: cannot resolve symbol

    symbol : variable number1

    location: class BuffReadwww

    int sum = number1 + number2;

    C:\Documents and Settings\shamed\javaprogs\src\BuffReadwww.java:35: cannot resolve symbol

    symbol : variable number2

    location: class BuffReadwww

    int sum = number1 + number2;





    The system is out of resources.

    Consult the following stack trace for details.

    java.lang.OutOfMemoryError

  4. #4
    Super Moderator Json's Avatar
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    Default Re: Problem in BufferedReader

    The reason for the symbol issue is that your variables number1 and number2 are declared inside the try clause so you will not be able to reach them outside.

    Just move the last two lines into the try/catch.

    try
            {
                num = dataIn.readLine();
                int number1 = Integer.parseInt(num);
                num = dataIn.readLine();
                int number2 = integer.parseInt(num);
     
                int sum = number1 + number2;
                System.out.println("The Sum is " +sum);
            } catch (IOException e) {
                System.out.println("Error!");
            }

    // Json

  5. #5
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    Default Re: Problem in BufferedReader

    It's working now. Thank you sir Chris and sir Json.

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