java 映射流到映射
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时间：2020-11-02 10:32:16 来源:igfitidea点击:
Stream of maps to map
提问by Dariusz Mydlarz
How can I flatten a Streamof Maps (of the same types) to a single Mapin Java 8?
我怎么能展平Stream的Map（同类型）s到一个Map用Java 8？
Map<String, Long> toMap(Stream<Map<String, Long>> stream) {
return stream. ???
}
回答by Eran
My syntax may be a bit off, but flatMap should do most of the work for you :
我的语法可能有点不对，但 flatMap 应该为你完成大部分工作：
Map<String, Long> toMap(Stream<Map<String, Long>> stream) {
return stream.flatMap (map -> map.entrySet().stream()) // this would create a flattened
// Stream of all the map entries
.collect(Collectors.toMap(e -> e.getKey(),
e -> e.getValue())); // this should collect
// them to a single map
}
