Commit 24afdff

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修复拼写错误

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Original file line number	Diff line number	Diff line change
`@@ -284,7 +284,7 @@ static class Segment<K,V> extends ReentrantLock implements Serializable {`
`284`	`284`
`285`	`285`	`### JDK1.8 (上面有示意图)`
`286`	`286`
`287`		`-ConcurrentHashMap取消了Segment分段锁,采用CAS和synchronized来保证并发安全。数据结构跟HashMap1.8的结构类似,数组+链表/红黑二叉树。Java 8在链表长度超过一定阈值(8)时将链表(寻址时间复杂度为O(N))转换为红黑树(寻址时间复杂度为O(long(N)))`
	`287`	`+ConcurrentHashMap取消了Segment分段锁,采用CAS和synchronized来保证并发安全。数据结构跟HashMap1.8的结构类似,数组+链表/红黑二叉树。Java 8在链表长度超过一定阈值(8)时将链表(寻址时间复杂度为O(N))转换为红黑树(寻址时间复杂度为O(log(N)))`
`288`	`288`
`289`	`289`	`synchronized只锁定当前链表或红黑二叉树的首节点,这样只要hash不冲突,就不会产生并发,效率又提升N倍。`
`290`	`290`

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