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fix multiple annotations npe

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Hints annotation needs add @Retention(RetentionPolicy.RUNTIME), otherwise it will throw npe.
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Mike Liu 2021-04-18 18:53:20 +08:00 committed by GitHub
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docs/java/new-features/Java8新特性总结.md
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@ -872,6 +872,7 @@ System.out.println(string); // Nov 03, 2014 - 07:13
首先定义一个包装类Hints注解用来放置一组具体的Hint注解：
```java
@Retention(RetentionPolicy.RUNTIME)
@interface Hints {
Hint[] value();
}