write access to files by multiple thread

well...sorry if this seems dumb, but i am confused

so i thought i would clarify with a code sample

public class FileTester {

private static final int thread_count = 50;

public static void main(String[] args) {

try {

FileOutputStream fos = new FileOutputStream("out.txt");

Thread t[] = new Thread[thread_count];

for (int i = 0; i < t.length; i++) {

new Thread(new ConcurrentFileWriter(fos)).start();

}

fos.close();

}catch (IOException e) {

e.printStackTrace();

}

}

}

class ConcurrentFileWriter implements Runnable{

int times = 3;

FileOutputStream fos;

public void run() {

for (int i = 0; i < times; i++) {

try {

fos.write(new String("thread id :" + Thread.currentThread().getId() + " - " + i + "\n").getBytes());

} catch (IOException e) {

e.printStackTrace();

}

}

}

public ConcurrentFileWriter(FileOutputStream fos) {

this.fos = fos;

}

}

so from this example the writing content is different(to clarify my position in response to anans reply).

but all threads are writing to the same fileoutputstream.

now in my app its ok if i get the following output - (scenario 1)

thread id: 1 - 1

thread id: 2 - 1

thread id: 1 - 2

and so on.....

is it possible for me to get the following output (strings interleaved) - (scenario 2)

thread id: 1 thread id: 2 - 1

- 1

thread id: 1 -2

I can live with scenario 1, but not with 2.

so is it possible for me to get scenario 2 without synchronization ?

i hope i have clarified what i meant

Message was edited by:

chhasid

Message was edited by:

chhasid

chhasida at 2007-7-12 3:10:59 >