How to determine if a String has non-alphanumeric characters?

Question

I need a method that can tell me if a String has non alphanumeric characters.

For example if the String is \"abcdef?\" or \"abcdefà\", the method must return true.

Answer 1

You have to go through each character in the String and check Character.isDigit(char); or Character.isletter(char);

Alternatively, you can use regex.