jdk13快来了，jdk8的这几点应该看看！



jdk13快来了，jdk8的这几点应该看看！

jdk8虽然出现很久了，但是可能我们还是有很多人并不太熟悉，本文主要就是介绍说明一些jdk8相关的内容。
主要会讲解：
  • lambda表达式
  • 方法引用
  • 默认方法
  • Stream
  • 用Optional取代null
  • 新的日志和时间
  • CompletableFuture
  • 去除了永久代（PermGen） 被元空间（Metaspace）代替


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