Shulou(Shulou.com)06/03 Report--

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)

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