International characters in a swing component

If I have a UTF-8 encoded string that contains international characters, Japanese for example, the characters are not displayed correctly in, for example, a JLabel. I can change the Locale of a component, but is there a way to detect which Locale to use based on the contents of the String?

Thanks

[310 byte] By [sasdava] at [2007-11-26 16:21:33]