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Streams and lambdas give you powerful and elegant ways to work with Java collections. Here’s how to take advantage of them.

java 的 stream 让我们可以在应用层就可以高效地实现类似数据库 SQL 的聚合操作了，它可以让代码更加简洁优雅。 但是，假设我们要对一个 list 排序，得先把 list 转成 stream 流，排序完成后需要将数据收集起来重新形成 list，这部份额外的开销有多大呢?

blackhole.consume (arrayList); } } 性能测试结果： 可以看到，list.sort效率确实比stream.sorted要好。 为什么更好？ 流本身的损耗 java 的 stream 让我们可以在应用层就可以高效地实现类似数据库 SQL 的聚合操作了，它可以让代码更加简洁优雅。

We are having an issue in our production environment. I have a work around to it, but figured I would submit this to the group, just in case it is an actual bug in OpenJDK.

Java.8 Stream API function predicate consumer supplier - streams/Stream_Flat_map_Sorted_Collect.java at master · Jatish-Khanna/streams ...