public Notification(String type,Object source,long sequenceNumber,long timeStamp){
  super(source);
  this.source=source;
  this.type=type;
  this.sequenceNumber=sequenceNumber;
  this.timeStamp=timeStamp;
}

public Notification ( String type , Object source , long sequenceNumber , long timeStamp ) { super ( source ) ; this . source = source ; this . type = type ; this . sequenceNumber = sequenceNumber ; this . timeStamp = timeStamp ; }
creates a notification object .
