我有一個List<DataDTO>dataPerDemo and each list element hasList<AnotherDataDTO> dataForFirstDemo and it hasList<AnotherWeekDataDTO> weeksForFirstDemo.我對每個演示都有相同的結(jié)構(gòu)。期望的結(jié)果是將屬性值從第一個列表元素 weekForFirstDemo 傳播到其余的列表元素。我做到了，但我想知道如何通過使用 java 8 和流（可能是 flatMap）來優(yōu)化它。歡迎所有想法。問候private void propagateFlagWeekIsIncludedToTheAllDemos(List<BaselineRatingsSweepsTableDataDTO> sweepsDataPerDemo) { Iterator<BaselineRatingsSweepsTableDataDTO> sweepsIterator = sweepsDataPerDemo.iterator(); // No primary ... nothing if (!sweepsIterator.hasNext()) return; List<BaselineRatingsSweepDataDTO> sweepsForPrimaryDemo = sweepsIterator.next().getSweeps(); // Process remaining demos ( secondary,tersiary .. ) while (sweepsIterator.hasNext()) { List<BaselineRatingsSweepDataDTO> sweeps = sweepsIterator.next().getSweeps(); processSweeps (sweepsForPrimaryDemo, sweeps); }}private void processSweeps(List<BaselineRatingsSweepDataDTO> sweepsForPrimaryDemo, List<BaselineRatingsSweepDataDTO> sweepsForAdditionalDemos) { // TODO: assert equal sizes // sweepsForPrimaryDemo && sweeps sizes should be the same ! for (int i=0; i < sweepsForAdditionalDemos.size(); i++) { List<BaselineRatingsSweepWeekDataDTO> primaryWeeks = sweepsForPrimaryDemo.get(i).getWeeks(); List<BaselineRatingsSweepWeekDataDTO> additionalWeeks = sweepsForAdditionalDemos.get(i).getWeeks(); copyIncludeFlag(primaryWeeks, additionalWeeks); }}private void copyIncludeFlag(List<BaselineRatingsSweepWeekDataDTO> primaryWeeks, List<BaselineRatingsSweepWeekDataDTO> additionalWeeks) { // TODO: assert equal sizes for (int i=0; i < primaryWeeks.size(); i++) { if (primaryWeeks.get(i).getWeek().equals(additionalWeeks.get(i).getWeek())) { additionalWeeks.get(i).setIsIncluded(primaryWeeks.get(i).getIsIncluded()); } }}
2 回答
蕭十郎
TA貢獻1815條經(jīng)驗 獲得超13個贊
您可以在 java 8 中使用 IntStream 進行迭代：對于字符串列表，我在下面給出了一個示例，您可以根據(jù)您的實際列表進行修改：
private void copyIncludeFlag(List<String> primaryWeeks, List<String> additionalWeeks) {
IntStream.range(0, primaryWeeks.size()).forEach(weekNumber -> {
if (primaryWeeks.get(weekNumber).equals(additionalWeeks.get(weekNumber))) {
additionalWeeks.get(weekNumber).equals(primaryWeeks.get(weekNumber));
}
});
}
我不知道這是否是您要查找的內(nèi)容或其他內(nèi)容。但是對于迭代，您可以使用它，它會對您有所幫助。只需更改方法參數(shù)中的列表類型即可。
如果對您有幫助，請告訴我。
我只是建議，它可能是也可能不是確切的答案。
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