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Merge pull request #1680 from stone0090/patch-1

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Update java-collection-questions-02.md
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@ -276,7 +276,7 @@ JDK1.8 的 `ConcurrentHashMap` 不再是 **Segment 数组 + HashEntry 数组 +
**`ConcurrentHashMap` 是由 `Segment` 数组结构和 `HashEntry` 数组结构组成**。
Segment 实现了 `ReentrantLock`,所以 `Segment` 是一种可重入锁，扮演锁的角色。`HashEntry` 用于存储键值对数据。
Segment 继承了 `ReentrantLock`,所以 `Segment` 是一种可重入锁，扮演锁的角色。`HashEntry` 用于存储键值对数据。
```java
static class Segment<K,V> extends ReentrantLock implements Serializable {