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Update ArrayList-Grow.md

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`@@ -74,6 +74,9 @@`
`74`	`74`	`return true;`
`75`	`75`	`}`
`76`	`76`	```
	`77`	`+`
	`78`	+> 注意 :JDK11 移除了 `ensureCapacityInternal()` 和 `ensureExplicitCapacity()` 方法
	`79`	`+`
`77`	`80`	### 2. 再来看看 `ensureCapacityInternal()` 方法
`78`	`81`
`79`	`82`	可以看到 `add` 方法首先调用了`ensureCapacityInternal(size + 1)`

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