Question

我试图同时迭代两个数组，如下所示，

首先，如果countriesIterator有下一个元素，则域Iterator将循环播放。 CountryIterator有两个元素，域迭代器可能包含n个元素。当我循环domainIterator时，我用一个已经循环的值填充一个arraylist。当循环到达国家迭代器时，我把arraylist放在一个hashmap中。

  Iterator<String> domainIterator = selectedDomains.iterator();
                    Iterator<String> countriesIterator = selectedCountries.iterator();
                    filteredComplianceCount = new ArrayList<Integer>();
                    inProgressComplianceCount = new ArrayList<Integer>();
                    delayedComplianceCount = new ArrayList<Integer>();
                    nonComplianceCount = new ArrayList<Integer>();

                    //Looping Countries
                    while (countriesIterator.hasNext()) {
                        String countryKey = countriesIterator.next();
                        Country country = aparjithaDb.getCountryId(countryKey);

                    //Looping Domains
                        while (domainIterator.hasNext()) {
                            Domain domain = aparjithaDb.getDomain(domainIterator.next());
                            int domainId = domain.getDomainId();
                            int countryId = country.getCountryId();

                            //fetch datas from db based on country and domain id/
                            List<ChartData> allChartCDCounts = db.getAllChartCDCounts(countryId, domainId);

                            //iterate the list to get the count values
                            for (ChartData al : allChartCDCounts) {
                                int complied_count = al.getComplied_count();
                                int delayed_compliance_count = al.getDelayed_compliance_count();
                                int not_complied_count = al.getNot_complied_count();
                                int inprogress_compliance_count = al.getInprogress_compliance_count();

                                //add the count values to an arraylist
                                filteredComplianceCount.add(complied_count);
                                delayedComplianceCount.add(delayed_compliance_count);
                                inProgressComplianceCount.add(inprogress_compliance_count);
                                nonComplianceCount.add(not_complied_count);
                            }
                        }

                        //put the arraylist with in hashmap
                        compMap.put(countryKey, filteredComplianceCount);
                        delayedCompMap.put(countryKey, delayedComplianceCount);
                        inProgMap.put(countryKey, inProgressComplianceCount);
                        nonCompMap.put(countryKey, nonComplianceCount);

                    }

我的代码的问题在于，hashmap的键仍然是唯一的（键是添加值后的两个不同的国家/地区名称），但两个键的值保持不变。域Iterator只被调用一次，但它应该被调用两次，因为有两个不同的键。我该如何解决这个问题？

Answer 1

在countriesIterator的第一次迭代中，您的domainIterator已到达终点。您可能应该将Iterator<String> domainIterator = selectedDomains.iterator();添加到countriesIterator循环中，以便在countriesIterator的每次迭代时从头开始再次迭代。

从数据库中获取记录时循环使用while循环无法正常工作

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