Java 中的“代理對”是什麼？ - What is a "surrogate pair" in Java?

問題：

I was reading the documentation for StringBuffer , in particular the reverse() method.我正在閱讀StringBuffer的文檔，特別是reverse()方法。 That documentation mentions something about surrogate pairs .該文檔提到了有關代理對的內容。 What is a surrogate pair in this context?在這種情況下什麼是代理對？ And what are low and high surrogates?什麼是低代理和高代理？

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解決方案：

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