arrays类提供了一系列处理数组的静态工具方法，这些索引的数据结构的大小是固定的。

The arrays class provides a series of static utility methods for working with arrays, those indexed data structures that are of a fixed size.

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下面的例子使用了一个工具类etagcomputeutils来产生对象所对应的字节数组，并处理MD 5摘要逻辑。

The sample code USES a utility class EtagComputeUtils to generate a byte array representation of an object and to handle the MD 5 digest logic.

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