What is the easiest/best/most correct way to iterate through the characters of a string in Java?

Some ways to iterate through the characters of a string in Java are:

1. Using StringTokenizer?
2. Converting the String to a char[] and iterating over that.

What is the easiest/best/most correct way to iterate?

As far as correctness goes, this only works for Unicode Code Points in the Basic Multilingual Plane (those that can be represented by a single two byte char in Java). If you have characters outside of that, you will get two chars with an individual surrogate pair in each of them to represent a single real world character.

I use a for loop to iterate the string and use charAt() to get each character to examine it. Since the String is implemented with an array, the charAt() method is a constant time operation.

String s = "...stuff...";

for (int i = 0; i < s.length(); i++){
    char c = s.charAt(i);        
    //Process char
}

That's what I would do. It seems the easiest to me.