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Update Lambda表达式.md

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Java相关/What's New in JDK8/Lambda表达式.md
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@ -78,6 +78,7 @@ public class VaraibleHide {
}; };
inner.printInt(30); inner.printInt(30);
inner = (s) -> { inner = (s) -> {
//Variable used in lambda expression should be final or effectively final
//!int x = 10; //!int x = 10;
//!x= 50; error //!x= 50; error
System.out.print(x); System.out.print(x);
@ -85,4 +86,10 @@ public class VaraibleHide {
inner.printInt(30); inner.printInt(30);
} }
} }
输出 :
30
20
``` ```
lambda表达式和内部类一样，对外部变量捕获时，外部变量必须为final或者是最终变量(effectively final)的，也就是说这个变量初始化后就不能为它赋新值，
同时lambda不像内部类/匿名类，lambda表达式与外围嵌套块有着相同的作用域，因此对变量命名的有关规则对lambda同样适用。
## 5.[方法引用]()