预设值为255个位元组，但您可能想要变更长度。

This defaults to 255 bytes, but you might want to change it.

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第一个位元组来自保留作前置位元组用途的编码范围。

The first byte comes from a range of codes reserved for use as lead bytes.

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在衍生类别中覆写时，将指定位元组阵列中的所有位元组解码成一组字元。

When overridden in a derived class, decodes a sequence of bytes from the specified byte array into the specified character array.

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