Check String whether it contains only Latin characters?

Question

Greetings,

I am developing GWT application where user can enter his details in Japanese. But the \'userid\' and \'password\' should only contain English characters(L

Answer 1

For something this simple, I'd use a regular expression.

private static final Pattern p = Pattern.compile("\\p{Alpha}+");

static boolean isValid(String input) {
  Matcher m = p.matcher(input);
  return m.matches();
}

There are other pre-defined classes like \w that might work better.