public void updatePresonInfo(){
  this.leftPerson=person2LeavingPersonInfo.get(this.personId);
  this.enteredPerson=person2EnteringPersonInfo.get(this.personId);
}

public void updatePresonInfo ( ) { this . leftPerson = person2LeavingPersonInfo . get ( this . personId ) ; this . enteredPerson = person2EnteringPersonInfo . get ( this . personId ) ; }
a person may re - appear on the same link .
