thread can now be deleted, thanks mods

[Howard]

I PWN MYSELF

 

[EyeMWing]

have it search for 10, 13 or 10 AND 13 (A lot of the time they will appear together, but this will only create ONE line break)

 

[Howard]

Originally posted by: EyeMWing
have it search for 10, 13 or 10 AND 13 (A lot of the time they will appear together, but this will only create ONE line break)

Thanks, I guess I was on the right track.

 

[dighn]

on windows each new line is a return+new line (\r\n) combination

 

[DaveSimmons]

Originally posted by: EyeMWing
have it search for 10, 13 or 10 AND 13 (A lot of the time they will appear together, but this will only create ONE line break)

Yes, DOS/Windows use the pair, c++ "\r\n", but unix/linux/mac files often only include the "\n".

For the final line of a file, sometimes there is a \n or \r\n and sometimes there is not.

 

[Howard]

New question. How do I delete a line from a text file? I've tried writing all the lines EXCEPT the one I want deleted to a temporary file, then writing the lines of the temporary file into the original file, thus removing the line to be deleted. But it's not working... here's my code for that:

public static void delcountry (String inputfile) throws IOException
{
c.println ();
String line, country;
c.println ("Please enter the country you would like deleted from the file. ");
country = c.readLine ();
BufferedReader input;
PrintWriter output;
input = new BufferedReader (new FileReader (inputfile));
output = new PrintWriter (new FileWriter ("temp.txt", true));
line = input.readLine ();
while (line != null)
{
if (line != country)
{
output.println (line);
line = input.readLine ();
}
}
input.close ();
output.close ();
input = new BufferedReader (new FileReader ("temp.txt"));
output = new PrintWriter (new FileWriter (inputfile));
line = input.readLine ();
while (line != null)
{
output.println (line);
line = input.readLine ();
}
input.close ();
output.close ();
}

If you see a "c" as in c.println();, it means something like "System.out"

 

[EyeMWing]

I don't think you're closing your temporary file before you try to copy it over to the original file. But your textfileIO class is a great deal different than mine, so I can't be sure that's what the problem is.

 

[Howard]

So does "if (line != country)" work to exclude the line if the contents of the line matches the country to be deleted?

The text file is a plain list of countries.

 

[crystal]

is this compare "if (line != country)" work? i.e. try this code: if (line == country) to see if it will only print out the country you enter. BTW, I thought "==" or "!=", etc is only good on number.

 

[EyeMWing]

Originally posted by: Howard
So does "if (line != country)" work to exclude the line if the contents of the line matches the country to be deleted?

The text file is a plain list of countries.

Ahh. No it doesn't. It reads in the line as a string, and country is a string.

Do

if (line.equals(country)==false)

String.equals(String) is a built in String method. Just doing a flat out != comparison will check the memory addresses, because a String is not a primitive data type.

 

[dighn]

n/m