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FileLocking.java
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// newio/FileLocking.java
// (c)2021 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
import java.nio.channels.*;
import java.util.concurrent.*;
import java.io.*;
public class FileLocking {
public static void main(String[] args) {
try(
FileOutputStream fos =
new FileOutputStream("file.txt");
FileLock fl = fos.getChannel().tryLock()
) {
if(fl != null) {
System.out.println("Locked File");
TimeUnit.MILLISECONDS.sleep(100);
fl.release();
System.out.println("Released Lock");
}
} catch(IOException | InterruptedException e) {
throw new RuntimeException(e);
}
}
}
/* Output:
Locked File
Released Lock
*/