教妹学Java：最重要的数组结构之一：数组

Posted 2021-06-23 沉默王二

数组概览

“哥，我看你之前的文章里提到，ArrayList 的内部是用数组实现的，我就对数组非常感兴趣，想深入地了解一下，今天终于到这个环节了，好期待呀！”三妹的语气里显得很兴奋。

“的确是的，看 ArrayList 的源码就一清二楚了。”我一边说，一边打开 Intellij IDEA，并找到了 ArrayList 的源码。

/**
 * The array buffer into which the elements of the ArrayList are stored.
 * The capacity of the ArrayList is the length of this array buffer. Any
 * empty ArrayList with elementData == DEFAULTCAPACITY_EMPTY_ELEMENTDATA
 * will be expanded to DEFAULT_CAPACITY when the first element is added.
 */
transient Object[] elementData; // non-private to simplify nested class access

/**
 * The