A CharSequence provides only a single method for accessing its characters: charAt (x).

CharSequence只提供了一个方法来访问它的字符：charat (x)。

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The reason is that Rope represents lazy substrings using a dedicated class, allowing the implementation of charAt to remain simple for regular ropes.

原因是 Rope使用专门的类来表示延迟子串（lazy substring），因此使普通 rope 的 charAt的实现保持简单。

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To enable this new capability, the Rope's charAt method can be modified so that, on the first invocation, an iterator is constructed at the specified position.

为了支持这一新功能，可以修改 Rope的 charAt方法，这样在第一次调用的时候，就在指定位置上构建一个迭代器。

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Dr. Sylvain Charat is a graduate from the University of the Sorbonne, Paris, was chief of staff for a former French Minister of Finance in the French National Assembly, and is now a public affairs consultant, specializing in the welfare system.

FORBES: In Socialist France, Investors And Entrepreneurs Are An Endangered Species

Dr. Sylvain Charat is a graduate from the University of the Sorbonne, Paris, was chief political adviser of a former French Minister of Finance in the French National Assembly, and is now a public affairs consultant, specializing in the welfare system.

FORBES: In France's Welfare State Status Quo, Are We Seeing America's Future?