CODEWITHSUNDEEP
javajava.util.scanner
Zach H
Zach H

Reputation: 469

Java Scanner unable to read file

I'm doing a very simple text-parsing program, using files given to me by a friend. However, when I open the file using a Scanner like so,

Scanner scan = new Scanner(new File(path));
System.err.println(scan.hasNext());
while(scan.hasNextLine())
    System.err.println(scan.nextLine());
System.err.println(scan.next());

result:

false
Exception in thread "main" java.util.NoSuchElementException
at java.util.Scanner.throwFor(Scanner.java:855)
at java.util.Scanner.next(Scanner.java:1364)
at Test.main(Test.java:18)

the scanner treats the file(which is some 1400 lines long) as empty.

Can anyone think of any reason a scanner might not be able to see a file? I suspect the fact that the file was imported from a Windows machine to a Linux machine may have something to do with it, but my mind is open to other possibilities

edited for formatting and code errors

Upvotes: 4

Views: 7287

Answers (4)

Ajitsen
Ajitsen

Reputation: 51

I resolved it using new Scanner(new BufferedReader(new FileReader(fileName))) instead of new Scanner(new File(fileName))

Upvotes: 5

Mahdi_Nine
Mahdi_Nine

Reputation: 14761

it maybe occurred for this problems:

1-your file maybe isn't created.

2-your file is in use for other programs.

3-the path address is false.

Upvotes: 0

Zach H
Zach H

Reputation: 469

Found the problem: Looked at the file byte by byte. found an EOF character in the first byte. Java was ignoring the rest of the file.

Upvotes: 3

adrianboimvaser
adrianboimvaser

Reputation: 2633

EDIT: Fisrt guess was wrong

The file might have 1400 lines full of whitespaces.

Upvotes: 0

Related Questions