import java.io.FileOutputStream;
import java.nio.channels.FileLock;
public class Main {
public static void main(String[] args) throws Exception {
FileOutputStream fos = new FileOutputStream("file.txt");
FileLock fl = fos.getChannel().tryLock();
if (fl != null) {
System.out.println("Locked File");
Thread.sleep(100);
fl.release();
System.out.println("Released Lock");
}
fos.close();
}
}
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