排序 通过sorted排序也可在comparing后添加参数Comparator.reverseOrder()进行倒叙
list.stream().sorted(Comparator.comparing(BurdenPlanCommon::getCreateDate))
过滤
list.stream().filter(coal -> coal.getName() != null && !"空".equals(coal.getName()))
合并统计、根据name相同的合并,并将val相加,再取map的value转换回list
list.stream().collect(Collectors.toMap(MatchCoal::getName, coal -> coal, (coal1, coal2) -> {
coal1.setVal(coal1.getVal()+(coal2.getVal()));
return coal1;
})).values().stream().collect(Collectors.toList());
最值获取
double val = list2.stream().max(Comparator.comparing(MatchCoal::getVal)).get().getVal();
持续更新中......