Java 中的“代理对”是什么？ - What is a "surrogate pair" in Java?

问题：

I was reading the documentation for StringBuffer , in particular the reverse() method.我正在阅读StringBuffer的文档，特别是reverse()方法。 That documentation mentions something about surrogate pairs .该文档提到了有关代理对的内容。 What is a surrogate pair in this context?在这种情况下什么是代理对？ And what are low and high surrogates?什么是低代理和高代理？

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解决方案：

参考一： https://en.stackoom.com/question/Oldo
参考二： https://stackoom.com/question/Oldo