可以实现文件的序列化，文件存储等。

The document can be achieved serialization, and document storage.

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最后，是用于样式化、数据格式化、坐标存储等的各种实用工具类。

Finally, a variety of utility classes for styling, data formats, coordinate storage, and more are available.

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Fragments：演示fragment布局，回退栈，状态存储等

Fragments: Various samples that demonstrate fragment layouts, back stack, restoring state, and more.

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D-A-V-I-D Well, if I've got a five-letter word like D-A-V-I-D, well, that's like five bytes and yet we only have the ability thus far in this class to return one thing at a time I can't return five bytes to you, but wait a minute, those bytes by nature of a computer are just stored in RAM.

好的，如果有5个字母的单词，如，那是5个字节,我们只能返回一个东西,而不能返回5个字节，等一下，这些字节被计算机本能地,存储在内存中。

哈佛公开课 - 计算机科学课程节选