多个List 合并变成一个List+一个List 根据某个字段相等的另一个字段相加，并排序变成新的List

List<CurveTimeAndValueDomain> curves = new ArrayList<>();for (int i = 0; i < columnNames.size(); i++){if (columnNames.get(i).equals(PlantConstant.TENDOWNFX) || columnNames.get(i).equals(PlantConstant.TENDOWNQP)) {//10千伏以下 数据 进行缓慢处理curveTimeAndValueDomains = gently(belongDay, columnNames.get(i));}else{//一个一个场站加curveTimeAndValueDomains = curveManagerCommonMapper.selectSinglePlantPowerDay2(belongDay, columnNames.get(i), belongDay.substring(0, 4));}if(!Objects.isNull(curveTimeAndValueDomains)){for (CurveTimeAndValueDomain curve:curveTimeAndValueDomains){curves.add(curve);}}}

第一步：将多个List 相加

for (CurveTimeAndValueDomain curve:curveTimeAndValueDomains){curves.add(curve);}

 第二步：将加起来的List 中：time 相同的value值相加

//将曲线中 time 相同的 value 相加 并 去重List<CurveTimeAndValueDomain>  newCurve = merge(curves);public static List<CurveTimeAndValueDomain> merge(List<CurveTimeAndValueDomain> curves){Map<String,CurveTimeAndValueDomain> map = new HashMap<>();curves.stream().forEach(curve ->{CurveTimeAndValueDomain last = map.get(curve.getTime());if (null != last){if(!Objects.isNull(last.getValue())){curve.setValue(curve.getValue().add(last.getValue()));}}map.put(curve.getTime(),curve);});return map.values().stream().collect(Collectors.toList());}

第三步：将新的到的newCurve  List 排序

//按照time 进行排序newCurve.sort((curve1,curve2)->{Integer time1 = Integer.parseInt(curve1.getTime().replace(":",""));Integer time2 = Integer.parseInt(curve2.getTime().replace(":",""));return time1.compareTo(time2);});