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Merge pull request #1844 from samho2008/patch-1

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[docx fix]移除不必要的空格，Object[ ] -> Object[]
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docs/java/collection/java-collection-questions-01.md
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@ -80,8 +80,8 @@ Java 集合框架如下图所示：
### ArrayList 和 Vector 的区别?
- `ArrayList` 是 `List` 的主要实现类，底层使用 `Object[ ]`存储，适用于频繁的查找工作，线程不安全 ；
- `Vector` 是 `List` 的古老实现类，底层使用`Object[ ]` 存储，线程安全的。
- `ArrayList` 是 `List` 的主要实现类，底层使用 `Object[]`存储，适用于频繁的查找工作，线程不安全 ；
- `Vector` 是 `List` 的古老实现类，底层使用`Object[]` 存储，线程安全的。
### ArrayList 与 LinkedList 区别?