can you put the code $2$ into code $1.$

$1)$package observer.log

import scala.collection.mutable.Set as mSet

trait Loggable$[$Subject$,$ Delta$]$:

val observers: mSet$[$LoggingObserver$[$Subject$,$ Delta$]]=$ mSet.empty import scala.collection.mutable.ListBuffer

$2)$abstract class Loggable $\{$

private val observers: ListBuffer$[$LoggingObserver$]=$ ListBuffer$()$

private var timestamp: Long $=\_$

def attach$($observer: LoggingObserver$)$: Unit $=\{$

observers $+=$ observer

$\}$

def notifyAllObservers$()$: Unit $=\{$

timestamp $=$ System.currentTimeMillis$()$

observers.foreach$($observer $=>$ observer.update$($this$,$ timestamp$))$

$\}$

$\}$