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Old 11-22-2011, 01:57 AM   #1
LQ Newbie
Registered: Sep 2011
Location: India
Posts: 25

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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.
try {
	Scanner myFile = new Scanner(new FileReader("C:/Documents and Settings/shikhau/workspace/SanNumber/freelast.txt"));
	while (myFile.hasNext()) {
		i = myFile.nextInt();
catch (FileNotFoundException e){
          System.out.println("Sorry! This file is not found");
I get the following exception:
Exception in thread "main" java.util.InputMismatchException
	at java.util.Scanner.throwFor(Unknown Source)
	at Source)
	at java.util.Scanner.nextInt(Unknown Source)
	at java.util.Scanner.nextInt(Unknown Source)
What do I do?
Attached Files
File Type: txt freelast.txt (271 Bytes, 5 views)

Last edited by shik28; 11-22-2011 at 01:58 AM. Reason: Sentence editing
Old 11-22-2011, 03:02 AM   #2
Registered: Oct 2009
Posts: 467

Rep: Reputation: 139Reputation: 139
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.

Last edited by JohnGraham; 11-22-2011 at 03:03 AM.


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