你说你想知道最有效的方式，你不想知道的一些标准，这样做的内置方式。然后，我对你说：RTSL（读取源，卢克）：

You say you want to know the most efficient way and you don't want to know some standard built-in way of doing this. Then I say to you: RTSL (read the source, luke):

查看源$ C ​​$下 AbstractStringBuilder #reverse ，这被称为StringBuilder的＃相反。我敢打赌，它的一些东西，你就不会认为是一个强大的反向操作。

Check out the source code for AbstractStringBuilder#reverse, which gets called by StringBuilder#reverse. I bet it does some stuff that you would not have considered for a robust reverse operation.