import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.channels.FileLock;
import java.util.concurrent.TimeUnit;

public class FileLocking {
    public static void main(String[] args) throws InterruptedException, IOException {
        FileOutputStream fos = new FileOutputStream("file.txt");
        FileLock lock = fos.getChannel().tryLock();
        if (lock != null) {
            System.out.println("Locked file");
            TimeUnit.MILLISECONDS.sleep(100);
            lock.release();
            System.out.println("Release lock");

        }
        fos.close();
    }
}