public Expirer(){
  expirerThread=new Thread(this,"ExpiringMapExpirer-" + expirerCount++);
  expirerThread.setDaemon(true);
}

public Expirer ( ) { expirerThread = new Thread ( this , "ExpiringMapExpirer-" + expirerCount ++ ) ; expirerThread . setDaemon ( true ) ; }
creates a new instance of expirer .
