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Update JDK8接口规范.md

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Java相关/What's New in JDK8/JDK8接口规范.md
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JDK8接口规范
===
在JDK8中引入了lambda表达式，因此出现了函数式接口的概念，为了保持向前兼容性(比如泛型也是为了保持兼容性而失去了在一些别的语言泛型拥有的功能)，
Java接口规范发生了一些改变。
在JDK8中引入了lambda表达式，出现了函数式接口的概念，为了在扩展接口时保持向前兼容性(比如泛型也是为了保持兼容性而失去了在一些别的语言泛型拥有的功能)，Java接口规范发生了一些改变。。
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## 1.JDK8以前的接口规范
- JDK8以前接口可以定义的变量和方法