Map.merge(key, 1, Integer::sum)
https://stackoverflow.com/questions/81346/most-efficient-way-to-increment-a-map-value-in-java
Map.merge(key, 1, Integer::sum)
https://stackoverflow.com/questions/81346/most-efficient-way-to-increment-a-map-value-in-java
本文标题：Most efficient way to increment
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