ArrayList问题

Question

今天在看ArrayList源码，有如下困惑，希望得到大神们的解答。在ArrayList源码中定义了两个一模一样的数据结构，如下：private static final Object[] EMPTY_ELEMENTDATA = {};private static final Object[] DEFAULTCAPACITY_EMPTY_ELEMENTDATA = {};官网给出的解释是这样子的：private static final Object[] EMPTY_ELEMENTDATA = {};Shared empty array instance used for empty instances.而，另外一个：private static final Object[] DEFAULTCAPACITY_EMPTY_ELEMENTDATA = {};Shared empty array instance used for default sized empty instances. We distinguish this from EMPTY_ELEMENTDATA to know how much to inflate when first element is added.求解答啊，谢谢~~~而且，本人吃惊的发现，DEFAULTCAPACITY_EMPTY_ELEMENTDATA 这个东西是JDK 1.8中才加进来的，我就更加神奇了，为什么JDK 1.8中要加入这个呢？

Answer 1

We distinguish this from EMPTY_ELEMENTDATA to know how much to inflate when first element is added.
我没读过源码, 但是我看到题主的注释里面有这么一句, 我们根据第一个元素被添加时知道多少个元素去填充把它与EMPTY_ELEMENTDATA区分开来.