Arrays and ArrayLists the array is the most common data structure, present in nearly all programming languages.

数组是最常用的数据结构，几乎在所有的编程语言中都会出现。

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The order of values in the ArrayLists corresponds with the order of GUI controls in the XML file (refer back to the code for the XML file configuration).

ArrayLists 中值的顺序与 XML 文件中的 GUI 控件的顺序是一致的（回去参考 XML 文件配置的代码）。

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We start by forming an ArrayList containing a set of ArrayLists, in which each of the constituent ArrayLists contains exactly one element of the first Permutation Group.

我们开始形成包含一组ArrayLists的ArrayList，在其中，每个构成的ArrayLists正好包含第一个置换群的一个元素。

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