Real world example of application of the command pattern

Question

Command pattern can be used to implement Transactional behavior (and Undo).
But I could not find an example of these by googling. I could only find

Answer 1

public final class Ping implements Callable {

  private final InetAddress peer;

  public Ping(final InetAddress peer) {
    this.peer = peer;
  }

  public Boolean call() {
    /* do the ping */
    ...
  }
}
...
final Future result
    = executorService.submit(new Ping(InetAddress.getByName("google.com")));
System.out.println("google.com is " + (result.get() ? "UP" : "DOWN"));