How Java8 uses the computeIfAbsent method in Map to build a local cache
This article will explain in detail how Java8 uses the computeIfAbsent method in Map to build a local cache. The editor finds it very practical, so I share it with you as a reference. I hope you can get something after reading this article.
I. introduction to concept and use
In the Map API of JAVA8, a method computeIfAbsent has been added. The signature of this method is as follows:
Public V computeIfAbsent (K key, Function)
