List转Map
Map map = stats.stream().collect(Collectors.toMap(DemoEntity::getKey,
c -> c));
List转Map(过滤重复key)
Map result = items.stream().collect(Collectors.toMap(DemoEntity::getKey,
c -> c,(e1,e2) -> e1));
List转Map
Map map = stats.stream().collect(Collectors.toMap(DemoEntity::getKey,
DemoEntity::getStringValue));
List转Map>
Map> map = vars.stream().collect(Collectors.groupingBy(DemoEntity::getKey));
doc
Ignore duplicates when producing map using streams
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