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Merge pull request #2016 from Pengfei-Lu/patch-1

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Update java11.md for isEmpty() method.
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docs/java/new-features/java11.md
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@ -63,7 +63,7 @@ Java 11 增加了一系列的字符串处理方法：
## Optional 增强
新增了`empty()`方法来判断指定的 `Optional` 对象是否为空。
新增了`isEmpty()`方法来判断指定的 `Optional` 对象是否为空。
```java
var op = Optional.empty();