java function to test string for double byte characters

   I need to know if there is a way in java to check if the input string contains double byte characters.
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Try this:

"java to convert the string text(with double byte code character) I receive from JTextField and
convert it to ASCII code"

*All* Java characters are double byte, in the sense that a String is composed of char[] and char is two bytes
res_thisAuthor Commented:
I dont need to convert, just need to check if the double byte characters exist in the string
How many bytes are used depends on the encoding. For UTF-8, you could test as follows:
        for(int i = 0;i < s.length();i++) {
            String test = "" + s.charAt(i);
            byte[] bytes = test.getBytes("UTF-8");
            if (bytes.length > 1) {
                System.out.printf("char %s is %d bytes long\n", test, bytes.length);

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Java EE

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