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update java8-common-new-features.md

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docs/java/new-features/java8-common-new-features.md
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@ -681,7 +681,7 @@ public static void main(String[] args) {
System.out.println("User's city without flatMap: " + cityWithoutFlatMap);
}
```
在`Stream`和`Optional`中正确使用flatMap可以减少很多不必要的代码。
在`Stream`和`Optional`中正确使用`flatMap`可以减少很多不必要的代码。
### 判断 value 是否为 null