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

public static boolean isValidISOLatin1 (String s) {
    return Charset.forName("US-ASCII").newEncoder().canEncode(s);
} // or "ISO-8859-1" for ISO Latin 1

For reference, see the documentation on Charset.