package io;

import java.nio.*;

import java.nio.channels.*;

import java.io.*;

import java.util.concurrent.*;

/**

* RUN:

* javac io/FileLocking.java && java io.FileLocking

*

* OUTPUT:

* File locked

* Lock released

*/

public class FileLocking {

public static void main(String[] args) {

try {

FileOutputStream fos = new FileOutputStream(new File("file.txt"));

FileLock fl = fos.getChannel().tryLock();

if (fl != null) {

System.out.println("File locked");

TimeUnit.MILLISECONDS.sleep(1000);

fl.release();

System.out.println("Lock released");

}

fos.close();

}

catch (Exception e) {

throw new RuntimeException(e);

}

}

}