LinuxQuestions.org - [SOLVED] Retrieve numerical values from a text file

- Programming (http://www.linuxquestions.org/questions/programming-9/)

- - Retrieve numerical values from a text file (http://www.linuxquestions.org/questions/programming-9/retrieve-numerical-values-from-a-text-file-914851/)

Retrieve numerical values from a text file

I have to retrieve numbers from a text file which is as shown in the attachment. I have written the following code snippet just to check if I am able to print the numbers in the file.

Code:

try {

        Scanner myFile = new Scanner(new FileReader("C:/Documents and Settings/shikhau/workspace/SanNumber/freelast.txt"));

        while (myFile.hasNext()) {

                i = myFile.nextInt();

                System.out.println(i);

                                

        }

}

catch (FileNotFoundException e){

          System.out.println("Sorry! This file is not found");

}

I get the following exception:

Code:

Exception in thread "main" java.util.InputMismatchException

        at java.util.Scanner.throwFor(Unknown Source)

        at java.util.Scanner.next(Unknown Source)

        at java.util.Scanner.nextInt(Unknown Source)

        at java.util.Scanner.nextInt(Unknown Source)

What do I do?

You're getting this exception because you're trying to get an int (with nextInt()) when the next token is not recognised as an integer. Have a look at the docs for Scanner here. In particular, hasNextInt() will let you see if the next token is an int and next() will let you skip any non-int input. Exactly how you want to do that depends on how strict/forgiving you want to be on the format of the configuration file.