stream重复Key的处理

Map<String, List<Model>> modelMap = modelList
.stream()
.collect(Collectors
.toMap(model -> model.getDate(),
model -> new ArrayList<Model>(Arrays.asList(model)),
(List<Model> oldList,
List<Model> newList) -> {
oldList.addAll(newList);
return oldList;
}));

stream重复Key的处理

原文：https://www.cnblogs.com/wzhw2015/p/12334346.html