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Merge pull request Snailclimb#1 from lewisbyte/lewisbyte-patch-1-fix-typo

Update ArrayList源码+扩容机制分析.md

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Original file line number	Diff line number	Diff line change
`@@ -894,7 +894,7 @@ public class EnsureCapacityTest {`
`894`	`894`	`运行结果:`
`895`	`895`
`896`	`896`	```
`897`		`-使用ensureCapacity方法前:1773`
	`897`	`+使用ensureCapacity方法后:1773`
`898`	`898`	```
`899`	`899`
`900`	`900`	通过运行结果,我们可以看出向 ArrayList 添加大量元素之前最好先使用`ensureCapacity` 方法,以减少增量重新分配的次数。

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