spring - failed to manipulate my Arraylist -


i need , have arraylist of objects . object contains multiple fields i'm interested in question 2 date fields (date_panne date_mise , running) , 2 other time fields (heure_panne , time start), , obtain sum of difference between (date_panne, heure_panne) , (date_mise_en_marche; heure_mise_en_marche) give total time of failure. if can me please gratful function :

public string disponibile() throws exception {      int nbrearrets = 0;     list<intervention> allinterventions = interventiondao.fetchallintervention();     list<intervention> listinterventions = new arraylist<intervention>();      (intervention currentintervention : allinterventions) {         if (currentintervention.getid_machine() == this.intervention.getid_machine()              && currentintervention.getdate_panne().compareto(getproductionstartdate()) >= 0              && currentintervention.getdate_panne().compareto(getproductionenddate()) <= 0) {               listinterventions.add(currentintervention);         }      }     savedinterventionlist = listinterventions;       return "successview" ; }

assuming the dates truncated day , of type java.util.date, , times contain hours, minutes, seconds , milliseconds , of type date, start creating method like

private date combine(date dateonly, date timeonly) {     calendar datecalendar = calendar.getinstance();     datecalendar.settime(dateonly);     calendar timecalendar = calendar.getinstance();     timecalendar.settime(timeonly);      datecalendar.add(calendar.hour_of_day, timecalendar.get(calendar.hour_of_day));     datecalendar.add(calendar.minute, timecalendar.get(calendar.minute));     datecalendar.add(calendar.second, timecalendar.get(calendar.second));     datecalendar.add(calendar.millisecond, timecalendar.get(calendar.millisecond));      return datecalendar.gettime(); }

now, it's matter of looping through interventions want sum, computing difference between dates milliseconds, , add them:

long totalmillis = 0l; (intervention intervention : interventions) {     date marche = combine(intervention.getdatemiseenmarche(), intervention.gettimemiseenmarche());     date panne = combine(intervention.getdatepanne(), intervention.gettimepanne());     long differenceinmillis = marche.gettime() - panne.gettime();     totalmillis += differenceinmillis; }

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