Question

What is the most efficient way to reverse a string in Java? Should I use some sort of xor operator? The easy way would be to put all the chars in a stack and put them back into a string again but I doubt that’s a very efficient way to do it.

And please do not tell me to use some built in function in Java. I am interested in learning how to do it not to use an efficient function but not knowing why it’s efficient or how it’s built up.

Answer 1

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):

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.