[SOLVED] read last line

[Azndaddy]

Hi, can someone help me out in reading a file, at the moment, i can read a file by calling the command, OPEN.
i type in the path for the file, eg c:\test.txt that works fine, and in side there is 100 line.

but instead it start off at line 0 rather then 100.
I want to be able to read the last line from the text.

Thanks

the code i have at the moment are.

PHP Code:

String input = getInput();

buffer.setFileName(input);
buffer.setLine(Test.readFile(input));
editor.addBuffer(buffer);
System.out.println("File Name: "+reads.getCurrentBuffer().getLines().size()+ " Lines:) 


[Eranga]

Can you post more code segment that anyone can compile and run.

Seems you want to read a line-by-line?

[CaptainMorgan]

I forget the correct class and I'll be attempting to find it.. unless someone knows it, but you'll want to set read marker so that it positions the stream at line 100 and then read from there on. That is, if I understood you correctly.

[DonCash]

Hey Azndaddy.

Here is a really simple solution for you. This code will read in a .txt file and output the last line only to the console.

Code:

public static void main(String[] args) throws Exception {
		
FileInputStream in = new FileInputStream("file.txt");
BufferedReader br = new BufferedReader(new InputStreamReader(in));
		
String strLine = null, tmp;

while ((tmp = br.readLine()) != null)
{
   strLine = tmp;
}
		
String lastLine = strLine;
System.out.println(lastLine);
	
in.close();
}

[Eranga]

Much similar question discussed here later as well. But the users don't want to search the forums. It's not a good habit at all.

Yes, Don code is the solution. You can do modifications depend on your requirements. But the guideline is this, much simple way this is

[Azndaddy]

thanks for all feed back, but my assignment was due already.

And i didn't want to post up more code because that would end up being my whole assignment.

[rjuyal]

The code given above is not acceptable, if the number of lines in file are in thousands, and we need only last line,
why should we read the complete file?

can someone moveon to make it optimized...

[Eranga]

Do you have any suggestion pal.

[Zosden]

Heres a quick question why would you ever want to read from the last line of the code. Why not just put that line at the top.

[rjuyal]

i don' remember the api actually, it was in some apache package.

[Eranga]

Quote:

Originally Posted by Zosden

Heres a quick question why would you ever want to read from the last line of the code. Why not just put that line at the top.

But Zosden, who know that it's a log file or something like that. How can we change the oder of it.

[DonCash]

Quote:

The code given above is not acceptable, if the number of lines in file are in thousands, and we need only last line,
why should we read the complete file?

If you look at the original post, Azndaddy said the file was a 100 line file. So this code is more than acceptable.

Quote:

Heres a quick question why would you ever want to read from the last line of the code. Why not just put that line at the top.

This looks like a class assignment to me. He is obviousally learning Java..

[Azndaddy]

Your Correct DonCash

I am learning Java, and finding it abit complicated.
=)

[Eranga]

It's not complicated. Move step by step. We all are here to help you any time.

[Asset]

So what is the solution????????????????????



i'm going to make log for log: its a about 1000 lines and how to take last line fast????????????????????????
plz HELP!!!

[Eranga]

There are solutions, read the complete thread.

[Asset]

Quote:

Originally Posted by Eranga

There are solutions, read the complete thread.

rrrrrrrr
Don Cash:

public static void main(String[] args) throws Exception {

FileInputStream in = new FileInputStream("file.txt");
BufferedReader br = new BufferedReader(new InputStreamReader(in));

String strLine = null, tmp;

while ((tmp = br.readLine()) != null)
{
strLine = tmp;
}

String lastLine = strLine;
System.out.println(lastLine);

in.close();
}


but if i have 10000 lines it will make more than 10000 operations
its bad..

[Eranga]

Quote:

Originally Posted by Asset

but if i have 10000 lines it will make more than 10000 operations
its bad..

Can you prove that why it's bad?

[Asset]

Quote:

Originally Posted by Eranga

Can you prove that why it's bad?

oh sorry, girl, thnks i will use it