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Update java9.md

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@ -138,7 +138,7 @@ try (scanner;writer) {
**什么是 effectively-final 变量?** 简单来说就是没有被 `final` 修饰但是值在初始化后从未更改的变量。
正如上面的代码所演示的那样,即使 `writer` 变量没有被显示声明为 `final`,但它在第一次被复制后就不会改变了,因此,它就是 effectively-final 变量。
正如上面的代码所演示的那样,即使 `writer` 变量没有被显示声明为 `final`,但它在第一次被赋值后就不会改变了,因此,它就是 effectively-final 变量。
## Stream & Optional 增强
@ -258,4 +258,4 @@ System.out.println(currentProcess.info());
- New Features in Java 9:https://www.baeldung.com/new-java-9
- Java Try with Resourceshttps://www.baeldung.com/java-try-with-resources
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