quick way to get charAt code example

Example 1: quick way to get charAt

char[] chars = str.toCharArray();
for (int i = 0, n = chars.length; i < n; i++) {
    char c = chars[i];
}

Example 2: quick way to get charAt

String str = "a really, really long string";
for (int i = 0, n = str.length(); i < n; i++) {
    char c = str.charAt(i);
}