// This is known as the invoker

// It has a method press() that when executed

// causes the execute method to be called

// The execute method for the Command interface then calls

// the method assigned in the class that implements the

// Command interface

public class DeviceButton{

Command theCommand;

public DeviceButton(Command newCommand){

theCommand = newCommand;

}

public void press(){

theCommand.execute();

}

// Now the remote can undo past commands

public void pressUndo(){

theCommand.undo();

}

}