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Update ArrayList.md

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Original file line number	Diff line number	Diff line change
`@@ -85,7 +85,7 @@ public class ArrayList<E> extends AbstractList<E>`
`85`	`85`	`}`
`86`	`86`
`87`	`87`	`/**`
`88`		`- *默认构造函数,其默认初始容量为10`
	`88`	`+ *默认构造函数,DEFAULTCAPACITY_EMPTY_ELEMENTDATA 为0.初始化为10,也就是说初始其实是空数组当添加第一个元素的时候数组容量才变成10`
`89`	`89`	`*/`
`90`	`90`	`public ArrayList() {`
`91`	`91`	`this.elementData = DEFAULTCAPACITY_EMPTY_ELEMENTDATA;`

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