Android :: Convert JIS Character String To UTF8

I prepared following method to convert JIS character string to UTF8 on Android SDK v.1.5. However when I pass JIS character array into JIS the returned string value is same as input. I supposed it should return "undefined" or UTF8 string, Would anybody tell me why this phenomena is occurred?

public String JIS2UNICODE(char[] jis) { String unicode = new String(jis); try { unicode = new String(unicode.getBytes("ISO2022JP"), "ISO2022JP"); } catch (Exception e) { unicode = "undefined"; } return unicode; }