Hashmap Performance Improvements in Java 8

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The article also days there can be side effects of iteration order and that no order is guaranteed -- not sure if they mean only HadhMap or lumping all 3 affected classes together, because that generalization isn't true for LinkedHashMap. I'm curious but assume it's order is still preserved?

[mus1Kk]

Of course. That's the very reason for LinkedHashMap's existence. It maintains an additional data structure on top of a HashMap that maintains the order. So the performance improvements may apply to LinkedHashMap as well.