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修改一个处错误 #9

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2 changes: 1 addition & 1 deletion markdown/4-Stack and Queue.md
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Expand Up @@ -25,7 +25,7 @@ Java里有一个叫做*Stack*的类，却没有叫做*Queue*的类（它是个
| 无 | `offerFirst(e)` | 向栈顶插入元素，失败则返回`false` |
| `pop()` | `removeFirst()` | 获取并删除栈顶元素，失败则抛出异常 |
| 无 | `pollFirst()` | 获取并删除栈顶元素，失败则返回`null` |
| `peek()` | `peekFirst()` | 获取但不删除栈顶元素，失败则抛出异常 |
| `peek()` | `getFirst()` | 获取但不删除栈顶元素，失败则抛出异常 |
| 无 | `peekFirst()` | 获取但不删除栈顶元素，失败则返回`null` |

上面两个表共定义了*Deque*的12个接口。添加，删除，取值都有两套接口，它们功能相同，区别是对失败情况的处理不同。**一套接口遇到失败就会抛出异常，另一套遇到失败会返回特殊值（`false`或`null`）**。除非某种实现对容量有限制，大多数情况下，添加操作是不会失败的。**虽然*Deque*的接口有12个之多，但无非就是对容器的两端进行操作，或添加，或删除，或查看**。明白了这一点讲解起来就会非常简单。
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