Java Reference
In-Depth Information
8
public static void
main(String[] args)
9
throws
FileNotFoundException
10 {
11 Scanner console =
new
Scanner(System.in);
12 System.out.print(
ÐInput file: Ñ
);
13 String inputFileName = console.next();
14 System.out.print(
ÐOutput file:Ñ
);
15 String outputFileName = console.next();
16
17 FileReader reader =
new
FileReader(inputFileName);
18 Scanner in =
new
Scanner(reader);
19 PrintWriter out =
new
PrintWriter(outputFileName);
20
int
lineNumber =
1
;
21
22
while
(in.hasNextLine())
23 {
24 String line = in.nextLine();
25 out.println(
Ð/* Ñ
+ lineNumber +
Ð */
Ñ
+ line);
26 lineNumber++;
27 }
28
29 out.close();
30 }
31 }
499
500
S
ELF
C
HECK
1.
What happens when you supply the same name for the input and output
files to the
LineNumberer
program?
2.
What happens when you supply the name of a nonexistent input file to
the
LineNumberer
program?
C
OMMON
E
RROR
11.1: Backslashes in File Names
When you specify a file name as a constant string, and the name contains
backslash characters (as in a Windows file name), you must supply each backslash
twice:
in = new FileReader("c:\\homework\\input.dat");
