public void Undo()
{
if (prevSpeed == CeilingFan.HIGH)
{
ceilingFan.High();
}
else if (prevSpeed == CeilingFan.MEDIUM)
{
ceilingFan.Medium();
}
else if (prevSpeed == CeilingFan.LOW)
{
ceilingFan.Low();
}
else if (prevSpeed == CeilingFan.OFF)
{
ceilingFan.Off();
}
}
public void Execute()
{
prevSpeed = ceilingFan.GetSpeed();
ceilingFan.High();
}